Unit Converter
Convert between common units of length, weight, volume, and area instantly. Covers miles to km, pounds to kg, gallons to litres, and more.
Part of our Conversion Calculators collection.
Unit Converter
Free online calculator
How to Use This Calculator
- 1
Select the measurement category (length, weight, volume, or area).
- 2
Choose the unit you're converting from.
- 3
Choose the unit you're converting to.
- 4
Enter the value — the result appears instantly.
How Unit Conversion Works
All conversions use exact SI conversion factors: 1 mile = 1.60934 km = 5,280 feet = 1,760 yards 1 kg = 2.20462 lbs = 35.274 oz 1 gallon (US) = 3.78541 litres = 16 cups 1 acre = 4,047 m² = 0.4047 hectares = 43,560 sq ft
Example Calculation
Example: Convert 100 miles to kilometres
Inputs
category: lengthfromUnit: milestoUnit: kmvalue: 100
Result
160.93 km
100 miles × 1.60934 = 160.934 km.
Frequently Asked Questions
How many km in a mile?
1 mile = 1.60934 kilometres. So 10 miles = 16.09 km, 26.2 miles (marathon) = 42.195 km.
How many pounds in a kilogram?
1 kilogram = 2.20462 pounds. So 70 kg = 154.3 lbs.
How many litres in a US gallon?
1 US gallon = 3.78541 litres. Note that a UK imperial gallon is 4.54609 litres.