Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Contribution covers fixed costs and profit; it differs from gross margin when cost classifications differ.
Example Calculation
- Selling price: 20
- Variable unit cost: 12
Selling price = 20; Variable unit cost = 12. The primary result is 8.
Frequently asked questions
How do I use this calculator?
Enter selling price, variable unit cost. The result updates automatically. Use Reset to restore the example values.
What method does it use?
unit contribution=price−variable cost; ratio=contribution/price.. Contribution covers fixed costs and profit; it differs from gross margin when cost classifications differ.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.