Ratio Calculator — Free Online Calculator with Step-by-Step Guide
Simplify ratios, find missing values in proportions, and scale dimensions. Includes common aspect ratio presets (16:9, 4:3, 1:1, 21:9) for digital.
Ratio Calculator
Results below
Enter Values
Decimal (A/B)
1.777778
As Fraction
16 / 9
Scenario Comparison
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Simplified Ratio
16 : 9
= 1.777778
Aspect Ratio Visual Reference
16:9
HD Video / Widescreen
4:3
Standard Screen
1:1
Square
21:9
Ultrawide
3:2
Photo (35mm)
8:5
16:10 Display
9:16
Portrait Phone
2:3
Portrait Photo
4:5
Instagram Portrait
5:4
Medium Format
Cross-Multiplication
A : B = C : D → A × D = B × C
Enter A, B, and either C or D. The calculator solves for the missing value automatically.
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