Unit Converter

How this unit converter works

This unit converter translates a value between units within the same category — Length, Weight, Temperature, or Volume. Pick a category, enter a value, choose the source and target units, and the result updates instantly on every keystroke.

The conversion method

For most categories the converter uses a shared base unit. Each unit has a factor that represents how many base units it equals. To convert from unit A to unit B:

result = value × (factor of A) ÷ (factor of B)

• Length base: meter (m)
• Weight base: gram (g)
• Volume base: liter (l)

For example, converting 5 kilometers to miles: 5 × 1000 ÷ 1609.344 ≈ 3.10686 miles.

Temperature is special

Temperature scales don't share a zero point, so they can't go through a single base unit with a simple factor. Instead the converter applies the direct scale formulas:

• °C → °F: °C × 9⁄5 + 32
• °C → K: °C + 273.15
• °F → °C: (°F − 32) × 5⁄9
• °F → K: (°F − 32) × 5⁄9 + 273.15
• K → °C: K − 273.15
• K → °F: (K − 273.15) × 9⁄5 + 32

Common conversion factors

• 1 inch = 0.0254 meters (exact)
• 1 foot = 0.3048 meters (exact)
• 1 mile = 1609.344 meters (exact)
• 1 pound = 453.59237 grams
• 1 US gallon = 3.78541 liters
• 1 US cup = 0.236588 liters

Tips for accurate conversions

• Use the result's significant figures as a guide — rounding to 6 figures is plenty for almost any practical task.
• For cooking, note that US cups, tablespoons, and teaspoons differ from imperial equivalents.
• Weight and mass are treated equivalently here because the calculator assumes Earth gravity.
• Always confirm whether a recipe uses US or imperial gallons — a US gallon is about 3.785 L while an imperial gallon is 4.546 L.