Simplify any ratio to its lowest terms using the greatest common divisor, showing the GCD, decimal, and scale factor.
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First value (a)
Second value (b)
Both sides were divided by 4 to simplify.
Also in Ratios & Averages
Arithmetic
A ratio simplifier reduces a ratio to its lowest terms by dividing both parts by their greatest common divisor. It shows the GCD, decimal equivalent, and scale factor, making it easy to compare and work with ratios in recipes, maps, and proportions.
Find the greatest common divisor (GCD) of the two numbers, then divide both parts by it. For example, 12:8 has a GCD of 4, so it simplifies to 3:2.
A ratio is already in simplest form when the GCD of its parts is 1 — meaning they share no common factor other than 1.
Frequently asked questions
Yes — the process is identical. Both use the GCD to reduce to lowest terms. The notation differs (3:2 vs 3/2) but the math is the same.
A ratio like 0:5 simplifies to 0:1. However, 0:0 is undefined and cannot be simplified.
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