A profit tool built around
how sellers actually work.
GrowMargin is not a generic calculator. Every feature exists because a seller needed a clear, honest answer — without needing to be a financial analyst to understand it.
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
Platform fees pre-loaded, fully adjustable
Standard fees for Shopify and Etsy are pre-loaded and cover most sellers out of the box. Amazon FBA fees vary by product category and size, so we pre-fill a common starting point — you adjust the referral fee and fulfilment fee to your specific product.
Every fee field is editable. Different Shopify plan, different country Etsy rates, specific Amazon category — override any default to match your exact situation.
Plain-language insights
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.
Branded PDF exports
Export any calculation as a clean, professional PDF report. Add your business name and logo in settings and it appears on every export automatically.
- Clean, professional layout
- Your business name and logo included
- Full fee breakdown on every export
- Useful for supplier meetings, records, or business partners
Bloom & Co.
Shopify Profit Report
Blue Ceramic Mug — 500ml
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
Email profit reports
Send any calculation directly to your inbox as a formatted report. Useful for reviewing your numbers weekly, sharing with a co-founder or accountant, or just keeping a paper trail without managing files.
- Send to any email address
- Full breakdown included
- Useful for weekly reviews and sharing
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
% change analysis + outcome
Pro adds a third column showing how each metric changed as a percentage — and a clear outcome summary at the bottom telling you which scenario wins and by exactly how much.
- Per-metric % change (profit up 38%, margin up 18%…)
- Green for improvements, red for increases in cost
- Outcome summary: "Scenario B earns 38.4% more profit"
Three platforms. One tool.
Shopify, Etsy, and Amazon FBA all have completely different fee structures. GrowMargin handles all three, 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
A few things we deliberately avoided.
No subscriptions
Both plans are a single one-time payment. Your access never expires and we never charge you again.
Any currency
Set any currency symbol and the calculations work identically. The fee percentages are currency-neutral.
Your data is private
Saved calculations are stored against your account only. We don't sell data and don't have ads.
No jargon
Every label, insight, and piece of guidance is written for someone who has never used accounting software.
Fee data maintained
When platform fee structures change, we update the presets. You don't need to track this yourself.
Mobile-first
The calculators are fully usable on a phone. No horizontal scrolling, no pinching. Built for wherever you work.
Simple pricing. No surprises.
Pick the plan that fits where you are today. You can upgrade later and only pay the difference.
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
Pro
For sellers ready to scale with confidence.
- Everything in Basic
- Compare calculations with % change per metric
- Overall profit outcome — which scenario wins and by how much
- Marketing projections & break-even ROAS
- Email profit reports (send to your inbox)
- Save up to 25 calculations
- Priority access to new features
Already on BASIC? Upgrade to PRO — pay only the difference ($29 − $15 + $5 processing fee = $19 total)