Common Conversions
| Unit | Equals |
|---|---|
| 1 inch | 2.54 cm |
| 1 foot | 0.3048 m (30.48 cm) |
| 1 yard | 0.9144 m |
| 1 mile | 1.609344 km |
| 1 pound (lb) | 0.45359237 kg |
| 1 ounce (oz) | 28.3495 g |
| 1 US gallon | 3.78541 liters |
| 1 US cup | 236.59 ml |
| 1 acre | 4,046.86 m² (0.4047 ha) |
How the Converter Works
Each category converts through one base unit (meters, kilograms, square meters or liters). Your value is multiplied by its unit's factor to get the base amount, which is then divided by every other unit's factor. All factors are the exact international definitions, for example 1 inch = 0.0254 m and 1 pound = 0.45359237 kg. Results are shown to 12 significant digits.
Temperature Formulas
- °F = °C × 9/5 + 32
- °C = (°F − 32) × 5/9
- K = °C + 273.15
Example: a 55-inch TV has a diagonal of 55 × 2.54 = 139.7 cm, and a 350 °F oven setting is (350 − 32) × 5/9 ≈ 176.7 °C.
Frequently Asked Questions
How many centimeters are in an inch?
Exactly 2.54 cm (25.4 mm). To convert inches to centimeters, multiply by 2.54; to go from centimeters to inches, divide by 2.54.
How do I convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 and add 32. For example, 20 °C × 9/5 + 32 = 68 °F. To go the other way, subtract 32 and multiply by 5/9.
Are US and imperial gallons the same?
No. A US gallon is 3.785 liters, while an imperial (UK) gallon is 4.546 liters, about 20% larger. The converter lists both, and the cups, pints, quarts and fluid ounces are US measures.
How many pounds are in a kilogram?
One kilogram is about 2.2046 pounds. A pound is defined as exactly 0.45359237 kg.