Free tool · Make more, spend less
Find where your business is leaking profit
Enter an average month of revenue and costs. In about three minutes you'll see your real margin, your break-even point and which costs are eating the most profit.
Your results
Enter your monthly revenue and costs to see your profit, break-even point and biggest leaks.
Monthly profit
Profit margin
of revenue you keep
Break-even revenue
Left after variable costs
of each sale covers fixed costs and profit
Where the money goes
Each cost as a share of revenue. The marker shows the rule of thumb; costs past it are flagged.
What if you…
Hypothetical scenarios, not predictions. Each changes one thing and assumes sales hold steady.
| Change | New monthly profit | Extra per year |
|---|
Turn your numbers into a 90-day plan
Copy this prompt into Claude. It already includes your numbers.
How this is calculated
- Costs that grow with sales (product, ads, fees, shipping) are treated as variable. Payroll, software and overhead are treated as fixed.
- Profit = revenue minus all costs. Margin = profit divided by revenue.
- Break-even revenue = fixed costs divided by the share of each sale left after variable costs.
- Flags compare each cost to a rough rule of thumb: product costs over 40%, ads over 15%, fees over 15%, shipping over 15%, payroll over 30%, software over 5% and other overhead over 10% of revenue. These vary a lot by industry, so a flag means "worth a look", not "wrong".
- The price scenario assumes you sell the same number of units and that fees rise with revenue. Cost scenarios assume sales stay the same.
- Your numbers stay in your browser. Nothing is saved or sent.
Questions about the numbers
What should I count as product costs?
Anything you pay to make or buy what you sold that month: materials, inventory, blanks and printing. Shipping to the customer goes under shipping and fulfillment.
Should I include what I pay myself?
If you take a set salary or regular draw, add it to payroll. If you just keep whatever is left, leave it out and treat the profit number as your pay.
Where do the rule-of-thumb limits come from?
They're rough ranges that are common for small online sellers and service businesses, not official benchmarks. A flag means a cost is worth a closer look, not that it's wrong.
What does break-even revenue mean?
It's the monthly revenue where you'd make exactly zero profit. Below it you lose money. Above it, every extra sale adds to profit at your margin after variable costs.
Are my numbers saved anywhere?
No. The calculator runs in your browser. Nothing is stored or sent to us.
Next steps
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