Ratio Calculator

Find the greatest common divisor (GCD) of both numbers and divide both by it. 24:36 has a GCD of 12, so it simplifies to 2:3. This calculator does it automatically — just enter the two numbers.

Multiply both sides by the same number. If you want to scale 3:5 so the first number becomes 15, multiply both by 5 → 15:25. This calculator's 'Scale' tab does the math: enter the target value for A and it solves for B.

Convert each to a decimal (A ÷ B) and compare. 3:4 = 0.75, 5:7 ≈ 0.714, so 3:4 is the larger ratio. The 'Compare' tab does this automatically and tells you which is larger.

A ratio expresses the relationship between two quantities (3 parts to 5 parts). A fraction expresses a part of a whole (3 out of 8 total). The ratio 3:5 equals the fraction 3/8 when asked 'what fraction of the total is the first part?' They're closely related but not identical.

Divide the first number by the sum, then multiply by 100. For 3:5, the first part is 3 ÷ (3+5) × 100 = 37.5% of the total. This calculator shows these percentages in the result panel automatically.

Yes — this calculator accepts decimal inputs. If your data naturally contains fractions (e.g., 2.5:3.75), the calculator will work with them. Note that simplification (GCD) is based on integer math, so decimal ratios won't simplify further unless both sides share a common decimal factor.