Simplify a ratio and see it as a decimal and a 1-based scale. Enter the two terms.
Usage Tip
Common screen ratios: 16:9 (widescreen), 4:3 (older), 21:9 (ultrawide). Simplifying shows whether two ratios match.
Decimal = A ÷ B
16:9 and 1920:1080 are the same ratio.
The decimal A/B and a 1:x scaling are also shown.
The second term cannot be zero.
A ratio compares two quantities, and simplifying it divides both terms by their greatest common factor, so 12 to 18 becomes 2 to 3. The simplified form keeps the same relationship in the smallest whole numbers. The decimal form divides the first term by the second, and the 1-based form scales the ratio so one of the terms equals 1.
Ratios are used for mixing paint, concrete, and fuel, for gear and screen aspect ratios, and for comparing quantities in recipes. A ratio does not tell you the actual amounts, only how they relate. To scale a ratio up, multiply both terms by the same number. The second term cannot be zero when the decimal is calculated.