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Free tool · 2026 edition

Magento TCO calculator: 3-year cost across 5 platforms

Compare 3-year total cost of ownership across Magento Open Source, Adobe Commerce, Shopify Plus, BigCommerce, and Salesforce Commerce Cloud. Real cost data from 200+ stores I've worked with — license + hosting + dev + extensions all factored in. Built to help you avoid the $50k brochure-driven decision.

  • Side-by-side TCO across 5 platforms in one view
  • Factors in GMV-tier license + per-tx fees + dev + extensions
  • Honest about what each platform hides in fine print
Adobe-Certified Magento + Hyvä developer Calibrated against 200+ store engagements
The calculator

Five inputs. Five platform TCOs. One verdict.

Tell the calculator your GMV bracket, B2B share, region, growth target, and current platform. It runs all 5 platforms in parallel and surfaces the cheapest, the best-fit, and what each platform hides in fine print. Pure client-side — no server round-trip, no email gate.

Verdict for your inputs

Directionally accurate within 15–25% for the median case in each GMV bracket. Use to rule out platforms — not to write a budget line.

Why this calculator

Four reasons it’s different from the vendor TCO sheet

Most TCO comparators are built by platform vendors and bias toward whoever paid for the report. This one is built by an Adobe-Certified developer who has done re-platform discovery on 200+ stores across all 5 platforms — the data points come from invoices clients have shared, not vendor pricing decks.

  • Real cost data Not vendor brochure pricing

    License fees, per-tx clauses, app/extension stacks, dev rates and infra costs are calibrated against the 200+ stores I’ve worked with across Magento, Shopify Plus, BigCommerce, and SFCC since 2017. Not what the platform sales deck says — what shows up on your invoices.

  • Opinionated Tells you which to pick

    Most TCO tools dump 5 numbers on you and walk away. This one runs your inputs through a verdict engine and tells you which platform earns its license — based on B2B share, GMV stage, and growth profile. You can ignore the verdict, but you’ll know what the data says.

  • Honest Hidden costs surfaced

    Each card has a “what’s hidden in this estimate” footer. Per-tx fees that compound at scale, GMV plan caps that force upgrades, SI partner premiums, custom-tier negotiation rooms. You leave knowing what each platform isn’t telling you.

  • 200+ stores Calibrated against real invoices

    I’ve done re-platform discovery for stores from $300k GMV up to $200M+. The cost models here come from the median of those engagements — not industry-report averages that bury the variance. Outliers are flagged in the FAQs.

What drives platform TCO

Six cost lines that decide which platform wins

License, per-tx fees, hosting model, dev cost, app stack, SI partner premium. Each is buried somewhere in vendor pricing pages — usually the most expensive one is the most carefully buried. The calculator surfaces all six side by side so the trade-offs become legible.

  • License model + GMV tiers

    Magento Open Source is $0 license forever. Adobe Commerce is GMV-tiered ($30k–$150k+/yr). Shopify Plus is flat $24k/yr but adds 0.15% per-tx fee on every order regardless of payment method. BigCommerce caps GMV per plan ($1M Plus / $5M Pro / Enterprise above) which forces silent upgrades. SFCC starts around $200k/yr and scales fast. The license tier is the line you negotiate — everything else flows from it.

  • Per-transaction fees (the silent killer)

    Shopify Plus charges 0.15% per transaction on top of payment-processor fees if you use Shopify Payments, 2.0% if you don’t (i.e. on Stripe / Adyen / Authorize.net). At $50M GMV that’s $75k–$1M/yr just for using your own gateway. BigCommerce and Magento charge zero per-tx. SFCC has none either, but bakes implicit margin into the license. The calculator surfaces this so it’s not a Year-2 surprise.

  • Hosting model + cloud infra

    Magento Open Source: self-hosted ($6k–$30k/yr depending on traffic). Adobe Commerce Cloud bundles AWS-based hosting but charges separately for higher-tier infra and Fastly upgrades. Shopify Plus and SFCC are fully hosted (no separate infra line). BigCommerce same. Hosted platforms shift the cost to license; self-hosted shifts it to your DevOps + cloud bill. Three-year horizon flattens this difference.

  • Dev cost (upfront + ongoing)

    Magento has the deepest customisation ceiling, and the highest dev cost: $20k–$80k upfront, $15k–$60k/yr ongoing. Adobe Commerce dev is similar but extension stack is lighter (B2B / RMA / segments are native). Shopify Plus dev is bounded by Functions and Liquid, so dev cost is lower ($12k–$30k upfront) but you hit the customisation ceiling fast. SFCC needs a certified SI partner ($80k–$200k+ upfront just for go-live) which is why the license-fee debate is moot at scale.

  • App / extension stack reality

    Shopify Plus apps run $1.5k–$3k/mo for a typical fashion or B2B store ($50k–$100k over 3 yrs). Magento extensions are mostly one-time (~$5k–$8k for a B2B-heavy stack). BigCommerce apps are middle ($6k–$12k/yr). Adobe Commerce includes B2B + RMA + segmentation natively, so extension spend stays under $3k. SFCC bakes most of this into the license fee. Apps are the line that grows fastest at scale — budget it like a SaaS subscription, not a one-time spend.

  • SI partner premium

    SFCC requires a certified Salesforce SI partner; rates run $250–$400/hr and most engagements start at $200k+. Adobe Commerce Cloud is similar tier-1 SI territory ($200–$300/hr). Magento Open Source has the widest dev pool (freelance to mid-tier $50–$150/hr). Shopify Plus has Plus Partners and Functions developers at $100–$200/hr but has the smallest senior-talent pool when you need real PHP/system architecture. The dev-pool tax is invisible in license tables — this calculator counts it.

How to use this

Five steps from inputs to a defensible decision

Assess → calculate → compare → simulate growth → decide. The calculator is a screening tool — it tells you which platforms to take seriously and which to drop from the shortlist. The five steps below frame how to use it without over-relying on the brackets.

  1. 01

    Assess

    Get GMV, B2B share, region(s), and 3-year growth target. These four numbers drive every cell in the platform-cost matrix. Don’t use a planning estimate — use last 12 months of actual revenue + the growth multiplier in your board deck. Conservative wins here.

    Inputs locked
  2. 02

    Calculate

    Run the calculator. It evaluates all 5 platforms in parallel against your inputs and produces 5 totals + a breakdown (license, hosting, dev upfront, dev ongoing, extensions). Recompute as you change inputs — no rate-limit, no save state, no email gate.

    5 platform TCOs
  3. 03

    Compare

    Cheapest is highlighted in green. Best-fit (based on your B2B share + GMV stage) is highlighted in orange. They’re often different platforms — cheap doesn’t mean right. Read the “hidden in this estimate” footer on each card to understand the trade-offs each platform doesn’t list on its pricing page.

    Trade-offs surfaced
  4. 04

    Simulate growth

    Toggle the growth multiplier (flat / 1.5x / 3x / 5x+). Per-tx fees and app spend scale with GMV; license + hosting don’t. The platform that’s cheapest at $5M GMV is rarely the platform that’s cheapest at $50M. Project to your 3-year target so the migration calendar gets the right answer.

    Growth-adjusted view
  5. 05

    Decide

    Read the verdict. If you agree, book a 30-min call to pressure-test the assumptions. If you disagree, send the inputs over — I’ll calibrate the model against your real invoices and tell you where the calculator is off. No upsell. The point is the right decision, not Magento for everyone.

    Decision made
Clear winners by stage

Three situations where the answer isn’t close

Most re-platform decisions are genuinely close — the calculator helps then. But three situations have honest, decisive answers regardless of inputs. If you fit one of these, the calculator is a sanity check, not a discovery exercise.

  • Sub-$1M GMV, mostly D2C

    Don’t pick Magento yet

    • TCO favours Shopify or BigCommerce by ~3–5x
    • Magento dev cost only pays off above $1M GMV
    • Hosted platforms keep DevOps off your plate
    • Per-tx fees are negligible at this revenue
    • Migrate to Magento later when scale demands it
    • App stack at this stage is < $200/mo
    • Pick Shopify Standard or BigCommerce Plus
  • D2C-heavy, $25M+ GMV, time-to-launch matters

    Shopify Plus is hard to beat

    • Hosted = no DevOps team, no infrastructure cost
    • Plus Launchpad for drops + sales scheduling
    • 3-month time-to-launch vs 6–12 months on Magento
    • App marketplace covers 90% of D2C use-cases
    • Per-tx 0.15% is cheap at this margin tier
    • Functions cover most server-side custom logic
    • Skip if you have any meaningful B2B share
Calibrate against your actual numbers

Send your inputs — get a calibrated 5-platform comparison in 24h

If the calculator surfaced a question — TCO bigger than expected, license tier confusion, migration cost, or vendor negotiation help — share the inputs and I’ll re-run the model against your real invoices. Written reply within 24 business hours. No upsell.

We will get back to you shortly.

What past clients say

Reviews from re-platform engagements

Public Upwork reviews — clickable on each card. Same playbook for every TCO calibration: real numbers, honest verdict, no platform loyalty.

I had the pleasure of working with Kishan Savaliya on our Magento 2 project, and I was thoroughly impressed with his work.

I had the pleasure of working with Kishan Savaliya on our Magento 2 project, and I was thoroughly impressed with his work. Kishan is not just a Magento developer, he is a true professional who sets a high standard with his top-notch technical skills. His task was to install a...

MA

Mohammed AL-Mayahi

Kishan is a great magento developer and he was a great asset to our organization.

Kishan is a great magento developer and he was a great asset to our organization. He worked with us for a long time and he provided to us a lot of knowledge about magento. we are very gratefull with

AR

Alfredo Rodriguez

Cronapis

Great from start to finish, Kishan has went above and beyond, helping at all hours of the day.

Great from start to finish, Kishan has went above and beyond, helping at all hours of the day. I would highly recommend him, and will always consider him for future

YA

Yavuz Arik

CEO, PostaCarda

As an American, I was hesitant to hire someone from a different country and culture.

As an American, I was hesitant to hire someone from a different country and culture. Kishan changed my mind. He was very cooperative, easy to work with, and is very bright. He gets things done fast and efficiently, and is available when needed. His English is excellent and is...

DS

Danielle Siso

Perfect job!

Perfect job!

GG

Gert Grunius

After trying and failing with multiple development companies Kishan came to the rescue in our hour of need.

After trying and failing with multiple development companies Kishan came to the rescue in our hour of need. Without hesitation Kishan jumped right in. He operated fast and with purpose. I was impressed with his diligent and methodical approach to tackle the issue. While...

ML

Michael Lin

Natonic

Re-platform discovery delivered across

  • United States
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  • Australia
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  • France
  • Netherlands
  • India
FAQ

Twelve questions about the calculator’s methodology

How accurate is this calculator?

Honest answer: directionally accurate within ~15–25% for the median case in each GMV bracket, less accurate at the extremes. It’s a first-pass screening tool, not a procurement-grade quote.

What it gets right:

  • License tier ordering. Magento Open Source $0 vs Adobe Commerce $30k–$150k+ vs SFCC $200k+ — the ranking won’t change.
  • Per-tx fee impact at scale. Shopify Plus 0.15% adds up identically every time; the math is exact.
  • Dev cost order of magnitude. A $5M GMV store on Magento needs ~$40k upfront + $30k/yr ongoing — the bracket holds across most engagements I’ve seen.

Where it’s less accurate:

  • SFCC and Adobe Commerce license — both are negotiated. Tier-1 SI partners often hold ±30% pricing power. The calculator uses public list-equivalent ranges; your actual quote may be lower (negotiated) or higher (uplift for Adobe Commerce Cloud Pro vs Starter).
  • Custom dev edge cases — if your scope includes headless commerce, ERP integration, or multi-region inventory orchestration, dev cost can be 2–3x the calculator’s number.
  • Region-specific pricing — the model assumes US dev rates. EU SI partners run 0.7–0.9x; India / Eastern Europe freelancers run 0.3–0.5x; Tier-1 US/UK SIs can run 1.2–1.5x.

Use it to rule out platforms and frame the conversation, not to write a budget line.

Where’s the data from?

Three sources, in descending order of weight:

  1. ~200 store engagements I’ve done since 2017 — mostly Magento, but ~60 of those involved evaluating Shopify Plus, BigCommerce, SFCC, or WooCommerce as alternatives. The license / app / dev / hosting numbers come from invoices clients have shared during discovery, anonymised and median-aggregated by GMV bracket.
  2. Public pricing pages + published case studies — Shopify Plus, BigCommerce Enterprise, Adobe Commerce, and SFCC all publish bracket-level pricing or have it leaked across enough vendor blogs to triangulate. The calculator’s license-tier brackets reflect those.
  3. SI partner rate sheets — both my own ($65–$150/hr) and the Tier-1 SI rates I’ve seen quoted to clients (Magento OS: $50–$200/hr; Adobe Commerce: $150–$300/hr; SFCC: $250–$400/hr). These set the dev-cost upper bound.

What’s NOT in the data:

  • Internal Adobe / Shopify / Salesforce pricing decks (I don’t have these and wouldn’t use them — vendor-supplied numbers are biased).
  • Industry-report averages (Forrester / Gartner) — they bury variance and serve their sponsors.
  • List prices for SFCC — SFCC pricing is opaque; I use the median of what clients have actually paid (~$200k/yr starter, scaling fast).

If you have invoice data and want to calibrate the model against your actual numbers, send it via the form — I’ll re-run.

Why isn’t [niche platform] included?

The 5 platforms in the calculator (Magento Open Source, Adobe Commerce, Shopify Plus, BigCommerce, SFCC) cover ~85% of mid-market and enterprise commerce decisions in 2026. Niche platforms get omitted for one of three reasons:

  • Adjacent but smaller market — Centra, Spryker, commercetools, Saleor, Medusa.js, Sylius. These show up in re-platform shortlists at <5% frequency in my data. If you’re seriously evaluating one, send the inputs and I’ll add it to the calibration.
  • Plugin-not-platform — WooCommerce, PrestaShop, OpenCart. WooCommerce is on the form (because it’s common as a current-platform “source”), but I don’t calculate WooCommerce as a destination because it’s a WordPress plugin and TCO is dominated by WP hosting + plugin stack rather than the commerce layer.
  • Dying stacks — Magento 1, OpenCart, X-Cart, ZenCart. If you’re here you’re leaving them, not migrating to them.

Headless setups (Magento + Vue Storefront, Magento + Hyvä headless, BigCommerce + Next.js, commercetools + custom front-end) aren’t separate platforms in this calculator — they layer on top of one of the 5 and add ~$30k–$80k upfront + ~$15k–$40k/yr ongoing for the front-end. Use the calculator for the platform layer; add headless cost separately.

Why does Shopify Plus look so cheap on apps?

It doesn’t — it looks expensive. The calculator allocates $18k/yr (under $25M GMV) or $36k/yr (above) for Plus apps, which is $54k–$108k over 3 years. That’s the highest extension/app line of any platform in the model.

If you’re seeing a lower number than your actual app spend, common reasons:

  • Subscriptions stack adds fast. Klaviyo ($1k+/mo at scale), Recharge / Bold Subscriptions (~$500–$2k/mo), Loop Returns (~$700/mo), Yotpo / Stamped (~$300–$1k/mo), Gorgias / Re:amaze ($300–$1k/mo), Tapcart or Shop App customisation. A typical D2C Plus stack runs $3k–$5k/mo total — the calculator is conservative at $1.5k–$3k.
  • Plus Functions developer time isn’t in the app line. It’s in the “dev ongoing” bucket. If your Functions developer is contracted at $150/hr and you have ~5 hrs/wk of Functions work, that’s another $39k/yr.
  • Shopify Markets adds 1.5% on cross-border transactions. Calculator doesn’t separate this from the 0.15% per-tx fee.

If your actual Plus app spend is above $5k/mo, add the delta to the calculator output manually. The relative ranking still holds.

Why does Adobe Commerce look so expensive on license?

Because it is, in absolute terms. Adobe Commerce license starts around $30k/yr at the entry GMV tier and scales to $150k+/yr above $50M GMV. That’s real money — $90k–$450k+ over 3 years before any other line.

What the license buys you:

  • Native B2B Companies module — multi-buyer roles, quotes, requisition lists, Net-30. On Magento Open Source you’d need an extension stack (Aheadworks B2B Suite ~$2k, or build custom ~$15k+).
  • Page Builder + content staging — drag-drop CMS + scheduled content rollouts. Significant for marketing teams.
  • RMA + gift cards + reward points as native modules.
  • Customer segmentation + targeted promotions — without these, you’re buying Salesforce Marketing Cloud or Klaviyo + custom plumbing.
  • 24/7 SLA support — Adobe support tickets, not Stack Overflow + a freelance retainer.
  • Adobe stack integration — Marketo, Workfront, Real-Time CDP, Target. If you’re already an Adobe shop, this is the lock-in that earns the license.

The break-even math: Adobe Commerce earns the license fee when (a) B2B share is ≥ 50% AND GMV is ≥ $10M, OR (b) you’re already on Adobe Experience Cloud and the integration is the value driver. Below $10M GMV pure D2C, Adobe Commerce is overpriced — the calculator’s verdict engine flags this.

SFCC — really $200k+/yr?

Yes, and often higher. Salesforce Commerce Cloud (formerly Demandware) is multi-tenant SaaS priced as a percent of GMV (typically 1–3%) with a contractual minimum that lands around $200k/yr at the smallest tier and scales fast.

Concrete bands I’ve seen quoted (or paid by clients):

  • $10M–$25M GMV: ~$200k/yr minimum + variable component
  • $25M–$100M GMV: $300k–$500k/yr
  • $100M+ GMV: $500k–$1M+/yr

What you get:

  • Multi-tenant SaaS on AWS with 99.99% SLA
  • SFRA framework (server-side rendered Express + JS)
  • Einstein AI personalisation, recommendations, predictive sort
  • Salesforce ecosystem integration (Service Cloud, Marketing Cloud, Sales Cloud, Order Management)
  • Mandatory certified SI partner relationship

What earns it:

  • You’re already on Salesforce Service Cloud / Marketing Cloud and the data integration is the strategy
  • You’re a tier-1 enterprise needing 99.99% uptime SLA with contractual penalties
  • You’re a CPG / luxury / retail brand at $100M+ GMV where the SI partner ecosystem matters more than license cost

What kills the deal:

  • You’re below $25M GMV — license-as-percent-of-GMV math destroys margin at this tier
  • You’re not on the Salesforce ecosystem — you’re paying for integrations you won’t use
  • You need deep customisation outside SFRA — the customisation ceiling is real

If the calculator is showing SFCC as “best fit” for you, you’re probably already on Salesforce. If not, double-check the inputs.

Hidden costs in BigCommerce GMV caps?

BigCommerce’s plan tiers cap GMV: Plus stops at ~$1M trailing 12-month sales, Pro at ~$5M, Enterprise (negotiated) above that. Cross the cap and BC auto-bumps you to the next tier or forces a contract.

What this hides:

  • Silent upgrades. A growing store crosses $1M and the Plus plan ($300/mo) jumps to Pro ($400–$700/mo) without much warning. Annualised that’s an extra $1k–$5k/yr you didn’t budget.
  • Enterprise pricing is opaque. Above $5M GMV BC quotes Enterprise individually (typical: $20k–$50k/yr depending on traffic and feature set). The calculator uses ~$24k/yr at this tier — check your actual quote.
  • Per-tx fees. BC charges 0% per-tx — matching Magento. This is one of the few platforms where per-tx isn’t a hidden cost.
  • App / extension stack at the Enterprise tier. BigCommerce’s app marketplace is smaller than Shopify’s but apps for B2B (BundleB2B), reviews (Yotpo), and personalisation (Searchanise) run $400–$1k/mo each. A typical Enterprise B2B store ends up at $12k–$18k/yr in apps — the calculator allocates $12k/yr if B2B share > 25%.
  • Stencil customisation ceiling. BC’s theme framework (Stencil) is more flexible than Liquid but less so than Magento PHP. If you need deep PDP or checkout customisation, dev hours run higher than the calculator’s estimate.

BigCommerce wins on TCO at the $1M–$10M D2C-light-B2B tier. Above that, the GMV-cap dynamic and Enterprise pricing make the math harder to predict — get a quote in writing.

Can I plug in my actual numbers (not just brackets)?

Not in the on-page calculator (yet) — the brackets keep the model simple and avoid the “fake precision” trap where a 4-digit input creates an illusion of accuracy from a model with ±20% inherent variance.

If you want a calibrated 5-platform comparison against your actual invoices, use the form below:

  • Send your last 12 months actual GMV (not projection)
  • Send your actual current-platform invoices (license, hosting, app spend, dev retainer) — redacted is fine
  • Send your 3-year growth target
  • Flag anything custom (multi-region, B2B layer, headless front-end, ERP integration)

I’ll re-run the model against your actual numbers and send a written 5-platform comparison within 24 business hours. No upsell — if Magento isn’t the right answer for your situation, the deliverable will say so.

An exact-numbers v2 is on the roadmap (probably Q3 2026) but I want to calibrate the bracket model first against more data points.

What’s “dev ongoing” — what does it cover?

The yearly dev/maintenance retainer needed to keep the store operating after launch. Covers:

  • Bug fixes + uptime. Production issues during business hours (and after-hours if you have an SLA in the retainer). Typically 5–20% of monthly hours.
  • Feature iteration. A/B tests, copy + UX changes, new payment method onboarding, new region launch, seasonal landing pages. 30–50% of hours.
  • Security patches + version upgrades. Magento ships 2–3 minor versions a year. Adobe Commerce releases monthly security patches. Shopify Plus and SFCC handle this themselves (you save here). Plan for 5–15% of hours.
  • Extension / app updates. Each extension you ship needs maintenance when its dependencies (Magento core, payment gateway API, third-party SaaS API) change. 5–10% of hours.
  • Performance tuning. Cache warming, indexer optimisation, query analysis. 5–10% of hours.
  • Monitoring + alerting. New Relic / Sentry / Datadog setup + on-call rotation if you have one. 5% of hours.

Rough sizing in the calculator:

  • Magento Open Source under $5M GMV: $15k/yr (~150 hrs/yr at $100/hr)
  • Magento Open Source $5M–$25M: $30k/yr (~300 hrs/yr)
  • Magento Open Source $25M+: $60k/yr (~600 hrs/yr)
  • Adobe Commerce: ~80% of Magento OS — less ext maintenance because B2B/RMA are native
  • Shopify Plus: ~50% of Magento OS — no version upgrades, smaller surface area
  • BigCommerce: ~60% of Magento OS
  • SFCC: 100–200% of Magento OS — SI partner premium dominates

If you’re running on a $1.5k/mo retainer (~$18k/yr) and your store does $10M+ in GMV, you’re probably accruing tech debt. The calculator’s “dev ongoing” line is what it actually costs to keep things healthy.

How does this account for inflation / pricing changes?

It doesn’t — deliberately. The 3-year horizon uses 2026 nominal pricing without inflation adjustment, for three reasons:

  1. License + hosting tend to step rather than smooth. Adobe doesn’t raise prices 3% a year — they hold flat for 18 months and then add a tier or rebrand. Modelling smooth inflation creates false precision.
  2. Per-tx fees and apps scale with GMV, not inflation. The calculator has a growth multiplier (flat / 1.5x / 3x / 5x+) that adjusts these. If you also want 3% annual inflation on top, multiply the total by ~1.09 over 3 years.
  3. Dev rates are sticky. The freelance rate I quote a $5M client today is not 3% higher than 2 years ago — it’s either the same, or 20% higher because skills compounded. Smooth inflation doesn’t model how labour markets work.

If your finance team wants a CFO-grade NPV, the procedure is:

  • Take the calculator’s 3-year total
  • Discount Year-2 by ~5%, Year-3 by ~10% (use your weighted-average cost of capital)
  • Add a 5–10% contingency for vendor price increases
  • Add 10–20% contingency for scope creep

For a Year-1 vs Year-2 vs Year-3 split (rather than a flat total), the rough breakdown for each platform is in the calculator code — let me know via the form and I’ll send the year-by-year.

Magento Open Source — what’s the catch at $0 license?

The catch is that “$0 license” isn’t the same as “$0 to operate.” Magento Open Source has the highest variable cost of the 5 platforms in the calculator. The numbers shift from license to dev + hosting:

  • You self-host. $6k–$30k/yr depending on traffic. Cloudways, Sonassi, Hipex, JetRails are common. Cloudflare in front, redis cache, varnish, OpenSearch.
  • You’re responsible for security patches. Magento ships ~3 critical security patches a year. If you’re late to apply them, you’re on the hit list of every Magento exploit kit. Auto-patching tooling exists (Magecheck, Sansec, MageReport) but a human still QAs each release.
  • Extensions for B2B / RMA / segmentation are paid. Aheadworks, Amasty, Magenest each charge $200–$2,000 per extension, sometimes annual. Calculator allocates $5k–$8k for a typical extension stack — that’s already counted.
  • No SLA support. You’re on Stack Overflow + your dev retainer. Most stores at $5M+ have an on-call freelancer or a 5–10 hour/month minimum retainer.
  • Version upgrades require effort. Magento 2.4.4 → 2.4.6 → 2.4.7 → 2.4.9 each break some extensions. Plan for 1–2 weeks dev time per major version, ~once a year.

The break-even math: Magento Open Source is cheapest TCO when (a) GMV ≥ $1M (below this the dev cost doesn’t pay off vs a hosted SaaS), (b) you have B2B share < 50% (above this Adobe Commerce native B2B earns its license), and (c) you have access to a competent Magento dev (in-house, retainer, or freelance). Without the third, Magento Open Source becomes the most expensive platform on the calculator because dev cost spirals.

Should I trust this enough to make a $500k decision?

No — and I built it. The calculator is a screening tool: it tells you which platforms to take seriously and which to drop from the shortlist. It doesn’t replace the discovery work needed for a $500k decision.

What to do for an actual $500k re-platform:

  1. Use this calculator to drop 1–2 platforms from the longlist. If the cheapest is 4x your most-likely pick, the cheapest probably has a feature gap; if the most-likely pick is 2x the alternative, the alternative deserves a real evaluation.
  2. Get written quotes from each finalist. For SaaS platforms (Adobe Commerce, Shopify Plus, BigCommerce, SFCC) the negotiated price is often 15–30% lower than the calculator’s number; you only see this in writing.
  3. Talk to 3–5 reference customers per platform at your GMV tier. Ask specifically about Year-2 and Year-3 surprises. Vendors will introduce you to the happy ones; ask the references for unhappy ones too.
  4. Run a 4–6 week proof-of-concept on the top finalist. POC scope: one product flow, one B2B flow if applicable, one region launch. ~$25k — cheap insurance against a $500k mistake.
  5. Have a senior engineering perspective at the table. Not just procurement / commercial. The customisation ceiling is technical; CFOs often miss it.

If you’re at the “build a discovery deck” stage and want a sanity check on the calculator’s output, send the inputs — I’ll review for free and tell you if the verdict aligns with what I’d advise. No upsell. The point is the right decision; sometimes Magento isn’t.