Unit Converter

An all-in-one unit converter

We deal with different units every day: an American recipe in cups and ounces, a car speedometer in miles, a weather forecast in Fahrenheit, land measured in acres or dunams, and a data plan in gigabytes. This tool converts any value into every related unit in one instant table, across nine categories.

Supported categories

• Length: meter, kilometer, centimeter, mile, yard, foot, inch, nautical mile.
• Weight: kilogram, gram, tonne, pound, ounce, stone, carat.
• Temperature: Celsius, Fahrenheit, Kelvin.
• Area: square meter, hectare, acre, dunam, feddan, square foot.
• Volume: liter, milliliter, cubic meter, gallons, cups, spoons.
• Speed, time, data and energy.

Common conversions

Converting temperatures

Fahrenheit to Celsius: subtract 32, then multiply by 5/9. Example: 98.6°F = (98.6 − 32) × 5/9 = 37°C — normal body temperature. The reverse: multiply by 9/5 and add 32. Kelvin equals Celsius plus 273.15.

A note on data units

Data units use the binary system (1 KB = 1,024 bytes), as operating systems do. That's why a drive labeled 1 TB shows about 931 GB on your computer: manufacturers count in decimal (1,000).

Metric vs imperial

Most of the world uses the metric system (meter, kilogram, liter) because it's built on powers of ten, making math easy. The United States still uses imperial/US customary units (foot, pound, gallon) in daily life, and the UK uses a mix. That's why you need conversions when shopping from foreign sites, following American recipes, or comparing car and appliance specs.

Handy approximations to remember

• 1 inch ≈ 2.54 cm; 1 foot ≈ 30.5 cm.
• 1 mile ≈ 1.6 km; 1 km ≈ 0.62 miles.
• 1 kg ≈ 2.2 lb; 1 lb ≈ 454 g.
• 1 US gallon ≈ 3.79 liters.
• Temperature: °F = (°C × 1.8) + 32, so 37 °C is 98.6 °F.

Note that the “gallon”, “ton” and “ounce” differ between systems, which is why the tool names each unit precisely. For money, try the Currency Converter.

Frequently Asked Questions

Last updated: 2026-10-20