Inverse Proportion Rule
Solve inverse proportion problems. When two quantities are inversely proportional, their product remains constant. Enter three known values to find the fourth.
a × b = c × d
Enter 3 values to find the 4th
Why use this tool?
Inverse proportion is used when one quantity increases while another decreases. This tool helps you solve these problems quickly.
- Simple interface — enter three values and get the fourth instantly.
- Shows the formula — understand how the calculation works.
- Privacy-focused — all calculations happen in your browser. No data is sent to servers.
- Fast and free — no sign-up required, instant results.
How to use
- Enter three of the four values where a × b = c × d.
- Leave the field blank for the value you want to calculate.
- Click Calculate to see the result.
- View the calculated value and the formula used.
- Click Copy Result to copy the answer to your clipboard.
Frequently Asked Questions
Inverse proportion occurs when one quantity increases while the other decreases at the same rate. Mathematically, if a × b = c × d, then as one value increases, the other must decrease to maintain the same product.
Yes, the MushTools Inverse Proportion calculator is completely free with no sign-up required. All calculations happen in your browser.
No. Everything runs client-side in your browser. Your data is not stored or sent to any server.