Proportion Calculator
Solve a direct or inverse proportion from three values and show the relationship and units.
Example: 3 kg cost 45, so what do 5 kg cost?
Its value
Your result
Enter A, B, and C.
How to use it
- Choose direct or inverse.
- Enter the three values.
- Read the unknown.
Examples
- 3, 6, and 4 directDirect: 3, 6, and 4. The unknown is 8.00.
- 3, 6, and 2 inverseInverse: 3, 6, and 2. The unknown is 9.00.
- ZeroA is 0. A message asks for a value above zero.
Tool details and privacy
Direct: a over b equals c over the unknown. Inverse: a times b equals c times the unknown.
3, 6, and 4 in direct give 8.00. 3, 6, and 2 in inverse give 9.00.
Options
- Values are above zero and use two decimals. Do not type units inside the field.
Limits
- Amounts use two decimal places and up to 12 digits before the decimal point. Rounding is half up.
- 1,250 is rejected. Write 1250 or 1250.50.
- Zero is rejected in any of the three values.
Privacy
The numbers are calculated in your browser and are not sent to any server.
Questions
What is the unknown of 3, 6, and 4?
8.00 in a direct proportion.
And 3, 6, and 2 inverse?
9.00.
Does it keep the unit?
No. Numbers only.
Does it accept zero?
No.