Ratio Calculator
Simplify ratios, solve proportions (a:b = c:?), scale ratios, and compare multiple ratios.
Mode
Reduce a ratio A : B to its simplest form.
Simplified Ratio
3 : 5
GCD = 5
| Original ratio | 15 : 25 |
| Simplified | 3 : 5 |
| As decimal | 1 : 1.666667 |
| A as fraction of total | 15/40 (37.50%) |
| B as fraction of total | 25/40 (62.50%) |
Results
| Property | Formula |
|---|
| Simplify A:B | divide by GCD(A, B) |
| Proportion | A:B = C:D → D = BC/A |
| Part of total | A/(A+B) × 100% |
| As decimal | A ÷ B |
| Equivalent | A:B = kA:kB (any k) |
Common Ratios
| Ratio | Simplified | Decimal | Use |
|---|
| 16:9 | 16:9 | 1.778 | Widescreen |
| 4:3 | 4:3 | 1.333 | Standard screen |
| 1:1 | 1:1 | 1.000 | Square |
| 3:2 | 3:2 | 1.500 | Camera sensor |
| 2:1 | 2:1 | 2.000 | Panoramic |
| 1:1.618 | 1:φ | 0.618 | Golden ratio |
| 1:2 | 1:2 | 0.500 | Half |