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Instant result
The result is updated directly from the data entered.
Online Calculator
Compound proportion calculator
Solve a compound proportion by adjusting multiple directly or inversely proportional quantities relative to a known result.
Magnitude A
Magnitude B
Proportional result
400
Information
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Local processing
The calculations are done in your browser without sending the values to a server.
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Free
No registration, subscription, or paid API required.
Frequently asked questions
What is compound proportion?
It extends the rule of three to relationships involving more than two quantities.
Can I indicate inverse relationships?
Yes. Each quantity can be set as directly or inversely proportional.
How is it calculated?
The known result is multiplied by the change factors of each magnitude according to their relationship.
Can I use decimals?
Yes.