Built for sellers,
not accountants.
The profit margin tool anyone can operate.
Enter your selling price and costs. GrowMargin handles the platform fees and shows you exactly what you keep — in seconds.
Why I built GrowMargin
Spreadsheets break at the worst moment.
My "system" was an Excel file I half-trusted. One broken formula and I wasn't sure if I was making money or just moving boxes. I needed something I could rely on without maintaining it.
Not everyone is a spreadsheet person — and that's fine.
My dad runs a construction supply business. Sharp guy, knows his costs cold. But update a formula? Not happening. GrowMargin is for people who understand their business — not their spreadsheet software.
Platforms raise fees without warning.
When Etsy or Shopify adjusted their fees, my margins quietly shrank. With saved calculations, I pull up the product, change one number, and see the new margin immediately — no rebuilding anything.
Save the same product twice. See what a fee change really costs.
One save at current fees, another at the new rate, a third with a higher price to compensate. It turns a vague worry into an exact number — and tells you what selling price gets your margin back.
Want to see every feature in detail? See the full features page →
Up and running in under a minute.
Five steps from sign-up to knowing your real profit.
Sign in with Google
One tap to create your account. No passwords, no forms — just your Google account.
Choose a plan — once
Pick Basic ($15) or Pro ($29). This is a one-time payment, not a subscription. You pay once and keep access as long as the service exists.
Set up your profile (optional)
Add your business name and preferred currency. Both are optional — the calculators work perfectly without them. You can also upload a logo later from Settings, which appears on exported PDF reports.
Pick your platform & enter your numbers
Choose Shopify, Etsy, or Amazon FBA. Platform fees are pre-loaded. Type your selling price and costs — profit and margin appear instantly as you type.
Save calculations & compare scenarios
Save any calculation by name. Come back when fees change, tweak one number, and see the new margin immediately. Save the same product multiple times with different fee or price scenarios to find what actually works.
Which price makes you more money?
Save different versions of the same product — different prices, different costs, different platforms — then compare them side by side. See exactly what changes and what doesn't.
- BasicSide-by-side view of any two saved calculations
- Pro% change per metric + which scenario wins and by how much
| Metric | Scenario A | Scenario B | Change |
|---|---|---|---|
| Selling price | $29.99 | $34.99 | ▲ 16.7% |
| Platform fees | $3.20 | $3.75 | ▲ 17.2% |
| Total costs | $18.40 | $18.95 | ▲ 3.0% |
| Profit | $11.59 | $16.04 | ▲ 38.4% |
| Margin | 38.6% | 45.8% | ▲ 18.7% |
Scenario B earns 38.4% more profit
One payment. Lifetime access.
No subscriptions. No renewals. Pay once and use GrowMargin permanently.
BASIC
Everything you need to understand your profit.
Billed in USD · works in any currency
- 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
PDF exports use GrowMargin branding. Upgrade to Pro to add your own logo and business name.
PRO
For sellers ready to scale with confidence.
Billed in USD · works in any currency
- 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
- ROAS & break-even ad projections
Already on BASIC?
$$29 − $15 + $5 processing fee = $19 total. No hidden charges.
Frequently asked questions
Know your real profit. Starting today.
One-time payment from $$15. No subscription. No hidden fees.