Small business profit calculator: where you make money and where profit leaks

Enter or upload your monthly sales and costs to see gross profit, net profit, margins and the biggest cost to fix next. Free, no signup — your numbers stay on this device until you save.

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Gross profit vs. net profit

Gross profit = sales − cost of goods (what you paid for the products or materials you sold). It shows if each sale earns enough.

Net profit = gross profit − all other actual costs (ads, payroll, rent, other). It is what the business really kept.

Margin = profit ÷ sales, shown as a percentage.

Worked example (sample month)

Sales: $24,000
Cost of goods: $9,600 → gross profit $14,400 (60%)
Ads $4,200 + payroll $3,500 + rent $1,800 + other $600 = $10,100
Net profit: $14,400 − $10,100 = $4,300 (17.9%)

Sample data, not a real business. The largest cost after goods is ads, so that is the first place to check.