Unit Converter
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Convert between length, weight, temperature, area, and volume units instantly. Metric ↔ Imperial supported.
Unit Converter
About This Tool
Categories Covered
- Length: meter, kilometer, mile, yard, foot, inch, centimeter, millimeter
- Weight: kilogram, gram, pound, ounce, ton, stone
- Temperature: Celsius, Fahrenheit, Kelvin
- Area: m², ft², acre, hectare
- Volume: liter, gallon (US), milliliter, fl oz
Why Use a Unit Converter?
Whether you're cooking with a foreign recipe, planning a trip across borders, or doing engineering work, accurate unit conversion saves time and prevents costly mistakes. This tool covers the most-needed everyday and technical conversions in one interface.Frequently Asked Questions
What's the difference between US and Imperial gallons?
1 US gallon = 3.785 liters. 1 Imperial (UK) gallon = 4.546 liters. About a 20% difference. This calculator uses US units for gallons and fluid ounces.
Why does temperature conversion behave differently?
Temperature scales have different zero points (0°C ≠ 0°F ≠ 0K), so they need additive offsets in addition to scaling. Length and weight have a true zero, so they only need multiplication.
How precise are the conversions?
All conversions use exact internationally-defined factors (e.g. 1 inch = 0.0254 m exactly). Results are displayed with up to 6 significant digits.