Convert between units of length, weight, temperature, and volume instantly.
What is a Unit Converter?
A unit converter translates a measurement from one unit to another within the same physical quantity. This tool covers four of the most commonly needed categories: length (distance), weight (mass), temperature, and volume.
Whether you're cooking from a recipe that uses cups but your scale measures grams, converting a marathon distance from kilometers to miles, or checking if a temperature in Celsius is warm enough for a picnic, this converter handles it instantly with full precision.
How to Use
1Select a category: Length, Weight, Temperature, or Volume.
2Choose the From and To units from the dropdowns.
3Type a value in the input box — the result updates instantly.
4Use the swap button to reverse the conversion direction.
Formula
Length (base: meter)
1 km = 1000 m | 1 mile = 1609.344 m
1 foot = 0.3048 m | 1 inch = 0.0254 m
Weight (base: kilogram)
1 lb = 0.453592 kg | 1 oz = 0.0283495 kg
1 tonne = 1000 kg | 1 stone = 6.35029 kg
Temperature (special formulas)
°F = (°C × 9/5) + 32
K = °C + 273.15
Volume (base: liter)
1 US gallon = 3.78541 L | 1 cup = 0.236588 L
1 fl oz = 0.0295735 L | 1 pint = 0.473176 L
Frequently Asked Questions
1 mile = 1.60934 kilometers. Conversely, 1 kilometer = 0.62137 miles. Use the Length tab to convert between them.
°F = (°C × 9/5) + 32. For example, 100°C = (100 × 1.8) + 32 = 212°F. Use the Temperature tab in this converter.
1 kilogram = 2.20462 pounds. 1 pound = 0.453592 kilograms. Use the Weight tab to convert between kg, lbs, ounces, and stones.
1 US gallon = 3.78541 liters. 1 liter = 0.264172 US gallons. Note that a UK (imperial) gallon is larger: 1 UK gallon ≈ 4.54609 liters.