Know your true margins.
Track profits, not spreadsheets.
Most sellers lose 15-20% of their margin to hidden platform fees without realizing it. GrowMargin is built for ecommerce sellers to see exactly what they keep after all fees—in seconds.
Most sellers don't know their real profit.
Platform fees are buried in help docs. Spreadsheets take hours to set up and break when fees change. Free online calculators give you a number with no context. None of them tell you whether that number is good or bad.
Platform fees change quietly
Etsy, Shopify, and Amazon update their fee structures. Most sellers find out when their profits drop — not before.
Gut-feel pricing is a gamble
Pricing based on what feels right ignores compounding costs: transaction fees, processing fees, shipping, and ad spend all eat into your margin simultaneously.
A number without context is useless
Knowing you made $8 on a $40 product means nothing unless you know whether 20% margin is healthy, dangerous, or average for your category.
What GrowMargin does for you.
Live profit calculations
Your profit, margin, and full fee breakdown update with every keystroke. No submit button. No page reload. Change your selling price by $1 and see exactly how your margin shifts in real time.
- Profit per sale, updated instantly
- Margin percentage with visual indicator
- Full fee breakdown — every line itemised
- Total cost stack visible at a glance
Shopify
Payment processing · Transaction fee · Shipping
Etsy
Transaction fee · Listing fee · Payment processing
Amazon FBA
Referral fee · FBA fulfilment · Ad spend
Estimated platform fees, fully adjustable
We pre-fill standard fees for Shopify and Etsy based on what we think is current to give you a quick starting point. Amazon FBA fees vary heavily by product category and size, so we insert a common estimate.
Note: We do not maintain or guarantee fee accuracy. It is your responsibility to review and adjust the fees to match your exact situation.
Every fee field is completely editable. Different Shopify plan, different country Etsy rates, specific Amazon category — override any default to match your reality.
Plain-language insights Basic
After calculating, GrowMargin reads your numbers and tells you what they mean in plain English. Not just the figure — the interpretation. Is this a healthy margin? Are you pricing yourself out of profit? Should you raise your price before running ads?
Insights adapt to your actual numbers. A 10% margin on a $200 product triggers different guidance than a 10% margin on a $15 product.
Saved calculations
Blue ceramic mug
Etsy
$11.40
28% margin
Linen tote bag
Shopify
$18.70
42% margin
Scented candle set
Amazon FBA
$6.20
19% margin
Save scenarios and compare
Save any calculation with a name and come back to it later. Compare your best-selling products side by side to see which ones are actually worth scaling — and which ones are quietly draining your margin.
Basic plan saves up to 10 calculations. Pro gives you up to 25 saves.
PDF exports Basic & Pro
Export any calculation as a clean, professional PDF report. Every paid plan includes PDF export — Pro adds your own business name and logo to the header automatically.
- Clean, professional layout — Basic & Pro
- Full fee breakdown on every export — Basic & Pro
- Custom business name and logo in header — Pro only
- Useful for supplier meetings, records, or business partners
For sellers ready to run ads.
The Pro plan adds tools for the next stage: understanding whether your margins can support advertising spend.
ROAS & break-even projections
ROAS — Return on Ad Spend — tells you the minimum your ads need to return for you to stay profitable. GrowMargin Pro calculates your break-even ROAS automatically, so you can set realistic targets before spending a dollar.
- Break-even ROAS calculated from your real margins
- Maximum cost-per-acquisition (max CPA)
- 30-day revenue and profit forecast at scale
Business profile on PDF exports
Pro adds your business name and logo to the header of every PDF export — so reports look professional when you share them with suppliers, partners, or your accountant.
- Business name in PDF header
- Upload your logo — appears on every export
- Looks professional without any design work
Stop guessing. Compare.
Save different pricing scenarios, then put any two side by side. See exactly what changes — and which one actually makes you more money.
Side-by-side view
Select any two saved calculations and see them next to each other — selling price, product cost, platform fees, total costs, profit, and margin. No more switching tabs or scrolling back and forth.
- Works across platforms — compare Shopify vs Etsy
- Compare different price points on the same product
- Compare same product with different cost structures
Plain-language story: verdict, driver, action
Pro generates a full analysis from your two calculations — not just numbers, but what they mean. Every comparison produces a verdict, finds the single biggest lever, then surfaces concrete action steps with real numbers.
- Verdict badge: Improving, Declining, or Mixed
- Profit % change + margin shift in percentage points
- Full cost breakdown — what went up, what went down
- 1–2 action steps with specific numbers to act on
Email your numbers in one tap.
One tap generates a complete profit report and opens it in your email client — ready to send to a supplier, partner, or accountant. Full fee breakdown and plain-language insights included. No attachments, no formatting needed.
- Selling price, costs, and every fee line itemised
- Net profit and margin front and centre
- Insights(not shown in the image) explain what your numbers mean
- Works from iPhone and from the web — same report, one tap
Multiple platforms. One tool.
Shopify, Etsy, Amazon FBA, and Custom Stores all have completely different fee structures. GrowMargin handles them all, with platform-specific fields for each.
Shopify
Covers Shopify Payments processing fees (percentage + fixed), transaction fees, shipping, product cost, and ad spend. Adjustable for different Shopify plan tiers.
- Shopify Payments fee
- Per-transaction fixed fee
- Shipping cost
- Ad spend (optional)
Etsy
Covers Etsy's transaction fee (6.5% of sale + shipping), listing fee, and Etsy Payments processing fee. All adjustable by country.
- Transaction fee (6.5%)
- Listing fee ($0.20)
- Payment processing fee
- Shipping cost
Amazon FBA
Covers Amazon's referral fee (percentage of sale price, varies by category) and the FBA fulfilment fee (based on product size and weight).
- Referral fee (15% default)
- FBA fulfilment fee
- Ad spend (optional)
- Product cost
Custom Stores
Covers standard payment gateway fees (like Stripe or PayPal), custom transaction fees, and shipping. Perfect for WooCommerce or standalone sites.
- Payment gateway fee
- Custom transaction fee
- Shipping cost
- Ad spend (optional)
Seller-first design principles.
No subscriptions
Both plans are a single one-time payment. Your access never expires and we never charge you again.
No API connections needed
No complex store integrations. Your store data remains 100% private. Just punch in your numbers and get instant answers.
No jargon
Every label, insight, and piece of guidance is written for someone who has never used accounting software.
Mobile app is live on iOS
Paid users can access both web and mobile experience with no extra cost.
Simple pricing. No surprises.
Pick the plan that fits where you are today. You can upgrade later and only pay the difference.
Free
Try out the calculators and understand what GrowMargin does.
- Access to all calculators
- Live profit calculations
- Save 1 calculation
- Currency customisation
- ×No comparison tool
- ×No PDF or email exports
- ×Limited to 1 basic insight
- ×No marketing projections
Basic
Everything you need to understand your profit.
- Measure profit across major online seller platforms like Shopify, Etsy and Amazon
- Live profit calculations with beginner insights
- Save up to 10 calculations
- Compare any 2 saved calculations side by side
- PDF profit exports
- Currency customisation
- ×No % change analysis on comparisons
- ×No marketing projections or ROAS
- ×No email reports
Already on BASIC? Upgrade to PRO — pay only the difference ($29 − $15 + $5 processing fee = $19 total)
Ready to know your real profit?
One-time payment from $15. No subscription. Takes minutes to set up.