Convert between metric and US units for length, weight, temperature, volume, area, speed, pressure and angles, with every equivalent shown at once.
How to use the unit converter
- Choose a category, such as length or temperature.
- Type a value and pick the units to convert from and to.
- The result appears instantly, with the same value in every other unit of that category underneath.
Common conversions
| From | To | Multiply by |
|---|---|---|
| Miles | Kilometers | 1.609344 |
| Inches | Centimeters | 2.54 (exact) |
| Feet | Meters | 0.3048 (exact) |
| Pounds | Kilograms | 0.45359237 (exact) |
| US gallons | Liters | 3.785411784 |
| Acres | Square meters | 4,046.86 |
| PSI | Bar | 0.0689476 |
Temperature formulas
°F = °C × 9/5 + 32
°C = (°F − 32) × 5/9
K = °C + 273.15
For example, 10 miles is 16.09 km, 25°C is 77°F, and 1 US gallon is 3.785 liters.
US versus UK (imperial) volumes
US and UK gallons are different sizes: a UK gallon is about 4.546 liters, roughly 20% larger than a US gallon (3.785 liters). Pints and fluid ounces differ too. This converter uses US units unless marked "UK".
Frequently asked questions
How accurate are the conversions?
The converter uses internationally defined conversion factors, many of which are exact (for example, 1 inch = 2.54 cm). Results are shown to up to six decimal places.
How do I convert cooking measurements?
Use the volume category for cups, tablespoons and teaspoons. For converting cups of an ingredient to grams, you also need its density, which varies by ingredient.
Related tools
Results are estimates for planning and education only. They are not financial, tax, legal or medical advice. Check important numbers with a qualified professional.