45.00% is the example result. Read it using the units and relationship stated below.
Find the share of a selling price left after variable cost. Use contribution to assess whether each sale can help cover fixed costs.
Check the contribution from one unit
The difference between selling price and variable cost is contribution per unit. Dividing that difference by selling price expresses it as a percentage. Fixed overhead remains outside these two inputs.
When to use this result
Use the result to review a discount or choose which product to prioritise when capacity is limited. Compare contribution per constrained machine hour if products use very different amounts of that resource.
Check before you act
Include the variable expenses relevant to the sale. A positive contribution does not by itself establish net profit.
Example with the supplied inputs
Selling price: 100; Variable cost: 55. Result: 45.00%. The values are illustrative.
Compare one changed input
Selling price changes from 100 to 110. The result becomes 50.00%. All other inputs remain fixed.
Calculation rule
Result = (([Selling price] − [Variable cost]) ÷ ([Selling price])) × 100
Inputs and output
| Input | Example value | Entry convention |
|---|---|---|
| Selling price | 100 | Use selling price on the currency and period basis shown by the formula. Keep gross amounts, net amounts and unit amounts distinct; the page does not fetch a price or exchange rate. |
| Variable cost | 55 | Use variable cost on the currency and period basis shown by the formula. Keep gross amounts, net amounts and unit amounts distinct; the page does not fetch a price or exchange rate. |
Output: 45.00% is the example result. Read it using the units and relationship stated below. Use the formula to distinguish a cash amount, count, percentage or ratio.
How to use the page
Collect the inputs
Gather Selling price, Variable cost. Use one period and the units shown in the form.
Run the calculation
Enter the values and select the action. The calculation rule above explains how the inputs produce the result.
Compare a scenario
Change Selling price on its own, keeping the other inputs fixed. Read both results before changing another assumption.
Worked example
With the example inputs listed above, the result is 45.00%.
Change Selling price from 100 to 110 while keeping every other value fixed. The result becomes 50.00%. This comparison isolates that input; it does not forecast how other variables will respond.
Check the stated formula, units and limits before using the result in a decision.
Keep the displayed formula, input units and model scope with the result. Corrections or questions can be sent through the request section on this page.
Content updated: October 11, 2026