Conversion formulas
cm = inches × 2.54
inches = cm ÷ 2.54
cm = feet × 30.48
feet = cm ÷ 30.48
°F = (°C × 9/5) + 32
°C = (°F − 32) × 5/9
inches = cm ÷ 2.54
cm = feet × 30.48
feet = cm ÷ 30.48
°F = (°C × 9/5) + 32
°C = (°F − 32) × 5/9
Inches and feet convert by a fixed factor, so they are ratios: 1 inch is exactly 2.54 cm and 1 foot is exactly 30.48 cm. Temperature is different. The two scales start from different zero points, so you also have to add or subtract 32, which is why it does not work as a simple ratio. Our unit conversion guide has worked examples, heights in feet and inches, and shortcuts you can do in your head.
Quick reference
| Inches | Centimeters |
|---|---|
| 1 in | 2.54 cm |
| 6 in | 15.24 cm |
| 12 in | 30.48 cm |
| 24 in | 60.96 cm |
| Feet | Centimeters |
|---|---|
| 1 ft | 30.48 cm |
| 3 ft | 91.44 cm |
| 5 ft | 152.4 cm |
| 6 ft | 182.88 cm |
| Celsius | Fahrenheit | Reference point |
|---|---|---|
| -40 °C | -40 °F | Both scales meet |
| 0 °C | 32 °F | Water freezes |
| 20 °C | 68 °F | Room temperature |
| 37 °C | 98.6 °F | Body temperature |
| 100 °C | 212 °F | Water boils at sea level |