Converse calculation
Free tool for reverse arithmetic. Calculate an unknown value using +, −, ×
Similar calculation tools
Explanation of reverse calculation: With reverse calculation, you work backwards from the answer.
Example
- 5 × A = 20 → A = 20 ÷ 5
- A + 8 = 15 → A = 15 − 8
This tool automatically applies the correct reverse operation.