Formula
The greatest common divisor divides both sides:
Simplified ratio = left / gcd : right / gcd
A proportion solves a missing fourth number. This page only reduces a pair.
Assumptions
- Both numbers are whole.
- The right number is not zero.
Worked example
8 and 12 simplify to 2:3.
Input definitions
- Left and right number
- The two parts of the ratio, before it is reduced.
Limitations
Results are rounded for display. This is a classroom calculation, not a measurement from a lab or a financial filing.
Questions
Can I use decimals?
No. A ratio here uses whole numbers so the divisor is exact.
What if the numbers are already reduced?
The same pair is shown.