Unit Converter - Metric & Imperial
Convert between any units of length, weight, volume, temperature, speed, and more. Instant results with no ads. Perfect for cooking, DIY projects, travel, science, and everyday conversions.
What This Calculator Converts
| Category | Common Units |
|---|---|
| Length | inches, feet, yards, miles, mm, cm, m, km |
| Weight | ounces, pounds, tons, grams, kg, metric tons |
| Volume | cups, pints, quarts, gallons, ml, liters |
| Temperature | Fahrenheit, Celsius, Kelvin |
| Speed | mph, km/h, m/s, knots |
| Area | sq ft, sq yd, acres, sq m, hectares |
| Time | seconds, minutes, hours, days, weeks, years |
| Data | bytes, KB, MB, GB, TB |
Common Conversion Formulas
- 1 inch = 2.54 cm
- 1 foot = 30.48 cm
- 1 mile = 1.609 km
- 1 pound = 0.4536 kg
- 1 gallon = 3.785 liters
- 1 ounce = 28.35 g
- °F to °C: (°F - 32) × 5/9
- °C to °F: (°C × 9/5) + 32
Worked Examples
Example 1: 5 ft 6 in = 66 inches = 167.64 cm = 1.6764 m
Example 2: 180 lb = 81.65 kg
Example 3: 72°F = 22.2°C = 295.4 K
Example 4: 100 km = 62.14 miles
US Customary vs Metric
The US is one of three countries that still primarily use customary units (along with Myanmar and Liberia). Most of the world uses metric. When traveling or reading international recipes, this converter saves time and prevents mistakes.
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
°F = (°C × 9/5) + 32. 20°C = 68°F.
How many ounces in a cup?
8 fluid ounces (volume) or 4.25 ounces by weight for all-purpose flour.
What is the difference between an ounce and a fluid ounce?
An ounce measures weight. A fluid ounce measures volume. They are not interchangeable.
How do I convert miles to kilometers?
Multiply by 1.609. 10 miles = 16.09 km.
What is a stone in pounds?
A stone is a British unit equal to 14 pounds. 10 stone = 140 lb.
How do I convert recipes between cups and grams?
Depends on the ingredient. 1 cup of flour = 120g. 1 cup of sugar = 200g. Use a recipe converter for best accuracy.