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Accounting Net Profit Margin (Monthly) Calculator

Calculate your monthly net profit and net profit margin from revenue, cost of sales, operating expenses, interest, and taxes.

Your Details

Overview

This monthly net profit margin calculator estimates the percentage of revenue your business keeps after cost of sales, operating expenses, interest expense, and income tax expense. It can help you review monthly profitability and compare performance across periods.

How it works

The calculator adds cost of sales, operating expenses, interest expense, and income tax expense to find total expenses. It subtracts total expenses from monthly revenue to estimate net profit. Net profit margin is then calculated by dividing net profit by monthly revenue and multiplying by 100. A negative result indicates that included monthly expenses exceeded revenue.

How to use this calculator

  1. 1Enter total revenue earned for the month.
  2. 2Add the direct costs included in cost of sales.
  3. 3Enter monthly operating expenses such as payroll, rent, and marketing.
  4. 4Include interest expense and recorded income tax expense, if applicable.
  5. 5Review your monthly net profit and net profit margin.

Example Calculation

Monthly revenue

$50,000

Cost of sales

$20,000

Operating expenses

$15,000

Interest expense

$500

Income tax expense

$2,000

Net profit margin

25.00%

With monthly revenue of 50,000 and total expenses of 37,500, estimated net profit is 12,500 and the net profit margin is 25.00%.

Frequently asked questions

What is monthly net profit margin?

Monthly net profit margin is the percentage of revenue left after deducting all included costs and expenses for that month.

How do you calculate net profit margin?

Subtract total expenses from revenue to get net profit, then divide net profit by revenue and multiply by 100.

What expenses should be included in net profit margin?

Include cost of sales, operating expenses, interest expense, income tax expense, and any other costs needed to reflect the accounting period consistently.

Can net profit margin be negative?

Yes. A negative margin means the included expenses were greater than monthly revenue, resulting in a net loss.

Is net profit margin the same as gross profit margin?

No. Gross profit margin generally deducts only direct costs, while net profit margin also accounts for operating expenses, interest, taxes, and other included costs.

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Assumptions and warnings

Assumptions

  • All figures relate to the same monthly accounting period.
  • Revenue is entered before deducting any costs or expenses.
  • Cost of sales, operating expenses, interest expense, and income tax expense capture all relevant monthly expenses.
  • The result is an accounting estimate and depends on accurate, consistently classified financial records.

Warnings

  • This calculator provides an estimate only and is not accounting, tax, or financial advice.
  • Income tax treatment, timing differences, depreciation, and accounting policies can materially affect reported net profit.