Irish Calculators
Business

Net Profit Margin and Expense Calculator

Measure how much revenue remains as net profit, or derive that profit from the costs you enter. Use revenue excluding collected sales taxes and include each expense only once.

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Your numbers

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How the calculation works

Net profit margin measures how much of each unit of revenue remains after the costs included in the net result. Use a known net profit or build one from the listed income and expense categories, keeping the same reporting period and accounting boundary.

Net margin = net profit / revenue × 100. Breakdown profit = revenue − COGS − operating costs − interest − tax + other income − other expenses.

  1. Choose the profit basis

    Direct mode uses the profit supplied. Breakdown mode derives it from revenue after cost of goods sold, operating costs, interest, tax and other expenses, with other income added.

  2. Check category boundaries

    Ensure each charge appears once. For example, interest already included in an operating-cost total must be removed from that total before being entered separately.

  3. Relate net profit to revenue

    Divide the resulting profit by revenue and multiply by 100. The displayed profit lets you reconcile the numerator before interpreting the percentage.

Worked example: Profit

Sample inputs demonstrate the method. They are not a forecast or product offer.

The first example supplies €100,000 revenue and €15,000 net profit directly. Dividing €15,000 by €100,000 gives 0.15, displayed as a 15% net profit margin. No additional costs are deducted in direct mode.

Profit input
Known net profit
Revenue
100000
Net profit
15000

Expected result

Net profit margin
15%
Worked example: Loss

Sample inputs demonstrate the method. They are not a forecast or product offer.

Profit input
Known net profit
Revenue
50000
Net profit
-10000

Expected result

Net profit margin
-20%

Understanding your result

A 15% net margin means the entered net profit equals 15 cents per euro of revenue. It does not mean prices were marked up by 15%, because markup uses a cost denominator.

A negative margin records a net loss on the entered basis. Comparison across periods or businesses is meaningful only when revenue and expense definitions are consistent; the calculator supplies no industry benchmark.

Questions you might have

Is this the same as gross margin?

No. Net profit includes operating costs, finance costs and tax; gross margin deducts only cost of goods sold.

Choosing the right inputs

Revenue
Enter revenue excluding sales taxes collected for the tax authority. Revenue must be positive for this ratio, and it should match the period represented by profit or the expense breakdown.
Profit input
Choose direct mode when net profit is already known. Use breakdown mode when you can separate the listed expenses and other income without overlaps.
Tax expense or benefit
In breakdown mode, enter a tax expense as positive and a tax benefit as negative. The sign changes the net result, so it should match the underlying accounts.

Common mistakes to avoid

  • Do not compare this result directly with gross margin, which excludes fewer costs.
  • Do not subtract expenses again when using a net profit that already includes them.

Assumptions to check

  • Use amounts in one currency and one reporting period. Results are labelled EUR; the arithmetic also works for another consistent currency.
  • Use revenue excluding sales taxes collected for the tax authority. Include each expense only once.

Sources and method

Read our calculation and testing approach.