Net Profit Margin Formula
Learn how net profit and net profit margin are calculated from revenue, expenses, interest, taxes, and other income.
The net profit margin formula estimates how much of a business's revenue remains as profit after key costs are deducted and other income is added. It is useful for understanding overall profitability and comparing performance across different periods.
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Net Profit Margin
Where:
First calculate net profit by adding revenue and other income, then subtract operating expenses, interest expense, and taxes. Then divide net profit by revenue and multiply by 100 to get the margin percentage.
Variables Explained
| Variable | What It Means | Unit |
|---|---|---|
| revenue - Total Revenue | Total sales or turnover for the period before deducting costs. | currency |
| otherIncome - Other Income | Non-operating income included in net profit, such as interest earned or one-off gains. | currency |
| operatingExpenses - Operating Expenses | Regular business costs such as payroll, rent, utilities, and administration. | currency |
| interestExpense - Interest Expense | Borrowing or financing costs for the same period. | currency |
| taxes - Taxes | Tax expense included in the period's profit calculation. | currency |
| netProfit - Net Profit | Profit remaining after adding other income and subtracting costs. | currency |
Step-by-Step Calculation
Add total costs
Combine the main cost categories entered for the period.
totalCosts = operatingExpenses + interestExpense + taxes
Calculate net profit
Start with revenue, add any other income, and subtract total costs.
netProfit = revenue + otherIncome - totalCosts
Convert profit to a ratio
Divide net profit by revenue to see what share of sales is kept as profit.
profitRatio = netProfit / revenue
Convert to a percentage
Multiply the ratio by 100 to express the result as a percentage.
netProfitMargin = profitRatio * 100
Worked net profit margin example
Calculate total costs
$70,000 + $2,000 + $5,000
$77,000
Calculate net profit
$100,000 + $1,000 - $77,000
$24,000
Convert net profit to a revenue ratio
$24,000 / $100,000
0.24
Convert ratio to percentage
0.24 × 100
24.00%
Final Result
Net profit is $24,000 and net profit margin is 24.00%.
Assumptions
- ✓All values relate to the same accounting period.
- ✓Revenue and costs are entered in the same currency.
- ✓Taxes are treated as a direct expense entered by the user.
- ✓Other income is included in net profit only if the user chooses to enter it.
Limitations
- !The result is only as accurate as the figures entered.
- !The calculator does not adjust for accounting policies, depreciation methods, or exceptional items unless included manually.
- !A very low or zero revenue figure can make the margin less meaningful or undefined.
- !The calculation is a simplified estimate and may differ from formal financial statements.
Common Mistakes to Avoid
Using revenue from one period and expenses from another period.
Entering gross sales in one currency and costs in another.
Forgetting to include taxes when comparing with after-tax net profit figures.
Including one-off gains in other income without noting that they may inflate the margin.
Confusing net profit margin with gross profit margin or operating margin.
Related Formulas
Frequently Asked Questions
What is the formula for net profit margin?
Net profit margin equals net profit divided by revenue, multiplied by 100. Net profit is revenue plus other income minus operating expenses, interest expense, and taxes.
How do you calculate net profit before finding the margin?
Add revenue and other income together, then subtract operating expenses, interest expense, and taxes. The result is net profit.
Why is revenue used as the denominator?
Revenue is the total sales base for the period, so dividing net profit by revenue shows how much profit is kept from each unit of sales.
Can net profit margin be negative?
Yes. If total costs are higher than revenue plus other income, net profit becomes negative and the margin will also be negative.
Should other income be included in net profit margin?
It can be included if you want net profit to reflect non-operating income as well. If not, enter zero for other income.
What happens if revenue is zero?
Net profit margin cannot be calculated in the usual way when revenue is zero because dividing by zero is undefined.
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