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Margin of Safety Calculator

Find your margin of safety.

Result

30.00%
$75,000.00

How it is calculated

The tool takes your actual (or budgeted) sales and your breakeven sales, both as money amounts for the same period. It computes margin of safety (%) = (actual − breakeven) ÷ actual × 100 and the cushion in currency, actual − breakeven. Note that the percentage is measured against actual sales, not against breakeven.

Actual sales must be above zero and breakeven cannot be negative. If breakeven is higher than actual sales, the result is negative, meaning the business is already below breakeven. The tool does not compute breakeven itself; that comes from fixed costs divided by the contribution margin ratio. Amounts are displayed in dollars.

Worked example

Sales are $250,000 and the breakeven point is $175,000. The cushion is 250,000 − 175,000 = $75,000.00. As a share of actual sales, 75,000 ÷ 250,000 = 0.30, so the margin of safety is 30.00%. Sales could drop by 30% before the business stops covering its fixed costs, assuming costs behave as in the breakeven calculation.

Try this example →

Common mistakes

  • Dividing by breakeven sales instead of actual sales; that gives 42.86% here, not 30%.
  • Entering breakeven in units and actual sales in money, or covering different periods such as monthly breakeven against annual sales.
  • Using profit instead of sales as the actual figure. The formula compares revenue levels, not earnings.
  • Reading a negative margin as a typing error. It means sales are already below breakeven and the business is making a loss.
  • Treating a high margin as permanent: adding fixed costs raises breakeven and shrinks the cushion.

Sources

About this calculator

Margin of safety measures how far a company's actual (or budgeted) sales can fall before it slips into a loss, expressed as a percentage: Margin of safety = (Actual sales − Breakeven sales) / Actual sales × 100%, where breakeven sales is the revenue level at which total contribution margin exactly covers fixed costs.

Management accountants and financial analysts use this figure in cost-volume-profit (CVP) analysis to gauge operating risk: a high margin of safety means a business has a large cushion against a sales downturn, while a low or negative one signals that even a modest drop in sales could push the business into losses, which is critical information when deciding whether to add fixed costs like new equipment or leases.

Small business owners setting sales targets, finance students studying CVP and breakeven analysis, and startup founders evaluating how much runway a dip in revenue would leave all use this calculation to translate breakeven analysis into a concrete risk cushion.

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Comments (1)

  • Editorial team

    Run the tool twice to stress-test a plan. Take the sales you expect, then enter a figure 10% lower: with a breakeven of 175,000, sales of 250,000 leave a 30.00% cushion, but 225,000 leaves only 22.22%. The cushion also shrinks quickly when fixed costs rise, because breakeven moves up with them. Which drop in sales would worry you most in your own business?

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