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Net Profit Calculator

Calculate net profit and net margin after all expenses, interest, and taxes with waterfall breakdown from revenue to bottom line.

Tested tool guide Tested browser tools Checked August 16, 2026

What Net Profit Calculator does, with a checked example

Revenue does not reveal how much of a period's business activity reaches the bottom line. This calculator starts with revenue, deducts expenses, interest, and taxes, and shows the resulting net profit as both an amount and a percentage of revenue. Its waterfall makes each reduction visible. The most common mistake is double counting: if interest or taxes are already included in the expense figure, entering them again understates net profit.

Worked example

A concrete input and expected output from the current implementation.

Input

Revenue: $10,000
Expenses excluding interest and tax: $6,000
Interest: $500
Taxes: $700

Expected output

Net profit: $2,800
Net margin: 28%
Waterfall: $10,000 - $6,000 = $4,000; $4,000 - $500 = $3,500; $3,500 - $700 = $2,800

The deductions total $7,200, leaving $2,800 from $10,000 of revenue. Dividing $2,800 by $10,000 gives a net margin of 0.28, or 28%.

How the result is produced

1

Profit waterfall

The calculation begins with revenue and subtracts each entered deduction on the path to the bottom line. In compact form, net profit equals revenue minus expenses minus interest minus taxes. The waterfall preserves those stages so the user can see whether ordinary expenses, financing costs, or taxes account for each reduction.

2

Margin calculation

Net margin expresses the final profit relative to revenue: net profit divided by revenue, multiplied by 100. A $5,000 profit on $20,000 of revenue is therefore a 25% margin. Unlike the dollar result, the percentage supports comparisons across periods or businesses of different sizes, provided the inputs use comparable definitions.

Good uses

  • Estimate a month's bottom-line result after collecting preliminary revenue, expense, interest, and tax figures.
  • Test how a proposed cost reduction would change both net profit dollars and the percentage of revenue retained.
  • Reconcile an income statement summary by checking the arithmetic from reported revenue through separate deduction categories.

Limits and checks

  • Use figures from the same reporting period, currency, and accounting basis. Mixing monthly revenue with annual expenses produces a meaningless result.
  • Do not include interest or taxes inside total expenses and then enter them again in their separate positions.
  • Net margin is not meaningful when revenue is zero, and unusual negative revenue can make the percentage difficult to interpret.

Common questions

Which expenses belong in the calculation?

Include expenses that reduce profit for the same period represented by the revenue figure. If interest and taxes have separate entries, exclude them from the general expense amount. The calculator cannot determine whether a cost was classified correctly, accrued in the proper period, capitalized, or omitted, so its answer depends on the accounting figures supplied.

Is net profit the same as cash flow?

No. Net profit measures revenue remaining after recognized expenses, interest, and taxes. Cash flow also reflects when money is collected or paid, along with items such as borrowing, loan principal, asset purchases, and noncash expenses. This calculator answers a profitability question; it does not establish the cash generated or available in a bank account.

References and verification

The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.

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