Looking for a ratio simplifier and ratio scale calculator? This free tool gives you simplify ratios to lowest terms and scale them up or down. Just enter your numbers and press Calculate — results are instant.
A ratio compares two numbers as a pair, like 6 to 8. Simplifying means dividing both sides by their greatest common divisor — 6:8 becomes 3:4, the same proportion in lowest terms. Scaling keeps the proportion while changing the size: if A becomes a new value, B changes by the same factor. The calculator also shows the ratio as a fraction and as the percent A makes of the total.
Example: Ratio A=6, B=8
Simplified Ratio: 3 : 4
Divide both sides by their greatest common divisor. 6:8 shares a divisor of 2, so it simplifies to 3:4 — the same proportion in lowest terms.
Keep the proportion: multiply or divide both sides by the same number. If 3:4 becomes 6:8, both sides doubled. Enter the new value for A and the calculator finds the matching B.
They are the same relationship written differently: the ratio 3:4 is the fraction 3/4, which is 75%, and A is 42.86% of the total 3 + 4 = 7.