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Business Calculators

Business calculators answer the two questions that decide whether a product is worth selling: how much of each sale you keep, and how many sales are needed before the venture stops losing money. Small business owners, freelancers, market traders and anyone writing a plan for a lender need both figures. The Profit Margin Calculator takes your cost and your selling price and returns the gross profit and the margin as a percentage. That distinction matters, because a fifty per cent markup on cost is not a fifty per cent margin on the sale price, and quoting the wrong one makes a business look healthier than it is. The tool also works backwards, so you can set the margin you need and see what price it implies before you publish a list. The Break Even Calculator brings fixed costs into the picture. Given rent, salaries and other overheads alongside the per-unit cost and price, it tells you how many units must sell before the month is covered. Compare that number against what you realistically expect to sell, and you have a straight answer on whether the pricing works. Use them in order: set the margin first, then test the resulting price against break-even volume. Both calculate in your browser without sign-up.

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Profit Margin Calculator

Turn cost and price into margin, markup and profit, or work backwards from a target margin.

Business Calculators 487 uses
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Break Even Calculator

Work out break-even units, break-even revenue and contribution margin, with a sales target for any desired profit.

Business Calculators 484 uses

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Contribution margin and the break-even formula

The calculation rests on contribution margin. Subtract the variable cost per unit from the selling price per unit and you get the contribution margin per unit: the cash each sale leaves after the direct costs of producing it. Divide that margin by the selling price and multiply by 100 for the contribution margin ratio, expressed as a percentage of revenue.

Break-even in units is total fixed costs divided by the contribution margin per unit. Because you cannot sell a fraction of a unit, the result is rounded up, and break-even revenue is that rounded unit count multiplied by the selling price. The exact fractional figure is shown separately to four decimal places for anyone who needs it.

If you enter a desired profit, the same logic applies with the profit treated as an additional fixed cost: units required equals fixed costs plus target profit, divided by the contribution margin per unit, rounded up. The units above break-even are the difference between the two counts.

Where the selling price is equal to or below the variable cost, the margin is zero or negative and no volume can ever cover fixed costs. The tool reports that rather than returning a meaningless number.

Worked example: a product with 24,000 of fixed costs

Suppose fixed costs are 24,000 a year, the selling price is 60 per unit and the variable cost is 34 per unit.

The contribution margin per unit is 60 minus 34, or 26. The contribution margin ratio is 26 divided by 60, multiplied by 100, which is 43.33 percent. Break-even in units is 24,000 divided by 26, or 923.08, rounded up to 924 units. Break-even revenue is 924 multiplied by 60, which is 55,440.

Check it: at 924 units, revenue is 55,440 and total cost is 24,000 of fixed costs plus 924 multiplied by 34, or 31,416, giving 55,416. Profit is 24, marginally positive, which is exactly what rounding up should produce.

Now add a target profit of 13,000. Units required are 24,000 plus 13,000, divided by 26, which is 1,423.08, rounded up to 1,424 units, or 85,440 in revenue. That is 500 units above break-even, which makes intuitive sense: 500 units at a margin of 26 each is 13,000. The scenario table would show the loss shrinking as volume rises, crossing into profit at 924.

Using the result, and where the model simplifies

The contribution margin ratio is often the most useful number on the page. At 43.33 percent, every extra unit of revenue contributes about 43 pence or cents towards fixed costs and profit. It also shows how sensitive the business is to price: a five percent price cut removes a far larger slice of contribution than it does of revenue, pushing break-even volume up sharply.

The model assumes fixed costs stay fixed and variable cost per unit stays constant at every volume. Neither holds indefinitely. Fixed costs step up when you need a second machine, a bigger unit or another member of staff, and variable costs usually fall with bulk purchasing. Treat the break-even figure as valid over a limited range of output rather than at any scale.

Be careful about how you classify costs. Salaries for permanent staff are fixed, piece rates and materials are variable, and things like electricity are partly both. Misclassifying a large cost distorts the answer more than any rounding. The calculation also ignores timing, so a business can be above break-even on paper and still short of cash if customers pay slowly. This is general information for planning, not accounting or financial advice.

Frequently Asked Questions

Divide total fixed costs by the contribution margin per unit, which is the selling price minus the variable cost per unit. With 24,000 of fixed costs and a 26 margin, break-even is 923.08 units, rounded up to 924. Multiply that unit count by the selling price to get break-even revenue.
Contribution margin is what remains from each sale after its variable costs, so it is the amount available to cover fixed costs and then generate profit. Expressed as a ratio of the selling price, it shows how much of each unit of revenue is genuinely productive, and drives how quickly profit grows once you pass break-even.
Fixed costs do not change with output: rent, insurance, permanent salaries, software subscriptions. Variable costs rise with each unit sold: materials, packaging, payment processing fees, piece-rate labour, shipping. Semi-variable costs such as utilities should be split, with the standing element treated as fixed and the usage element as variable.
Add the target profit to your fixed costs and divide by the contribution margin per unit. Enter a desired profit figure and the tool does this for you, also reporting how many units that sits above break-even. A 13,000 target on a 26 margin needs 500 units more than break-even.
Because the selling price is at or below the variable cost per unit, making the contribution margin zero or negative. Every additional sale then increases the loss, so no volume covers fixed costs. The only fixes are raising the price or cutting the variable cost per unit until the margin is positive.