Unit Converter
Convert between 50+ units of length, weight, temperature, volume, area, and speed — all in one place.
Category
Convert
All Length conversions for 1 Kilometer (km)
About this tool
A comprehensive unit converter covering 6 categories and 50+ units: length (metric and imperial), mass/weight, temperature (Celsius, Fahrenheit, Kelvin), volume (liters, gallons, cups, teaspoons), area (m², acres, hectares), and speed (km/h, mph, knots). All conversions happen in the browser.
How to use it
Quick steps to get the most out of this utility.
- 1
Select a category
Choose from Length, Weight, Temperature, Volume, Area, or Speed.
- 2
Pick from and to units
Select the units you are converting between using the dropdowns.
- 3
Enter a value
Type in your number and the result appears immediately.
- 4
See all conversions
Scroll down to see the input value converted to every unit in the category at once.
Metric vs imperial — when it matters
The United States is one of three countries still using the imperial system for everyday measurements. If you travel, cook international recipes, follow scientific papers, or work with international teams, you will frequently need to convert between systems.
- Cooking: US recipes use cups and teaspoons; European recipes use grams and milliliters
- Travel: highway speeds in km/h vs mph, body weight in kg vs lbs
- Weather: Fahrenheit for US audiences, Celsius for the rest of the world
- Real estate: square feet (US) vs square meters (most other countries)
Frequently asked questions
How do I convert miles to kilometers?+
1 mile = 1.60934 kilometers. To convert, multiply the number of miles by 1.60934. For example, 10 miles = 16.09 km. Use the Length category and select Mile (from) and Kilometer (to).
How do I convert Fahrenheit to Celsius?+
Use the formula: °C = (°F − 32) × 5/9. For example, 72°F = (72 − 32) × 5/9 = 22.2°C. The Temperature category handles this automatically.
How do I convert pounds to kilograms?+
1 pound (lb) = 0.453592 kilograms. To convert, multiply by 0.453592. For example, 150 lbs = 68.04 kg.
What units are supported?+
Length (km, m, cm, mm, mile, yard, foot, inch, nautical mile), Weight (kg, g, mg, ton, lb, oz, stone), Temperature (°C, °F, K), Volume (L, mL, m³, US gallon, UK gallon, cup, fl oz, tbsp, tsp), Area (m², km², cm², ha, acre, mi², ft², yd²), and Speed (m/s, km/h, mph, knot, ft/s).
How accurate are the conversions?+
All conversion factors are based on official SI and US customary definitions. Results are shown to 8 significant figures, which is more than sufficient for everyday use. Scientific or engineering work may need additional precision.
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