Free Online Unit Converter
Convert between units instantly: length, weight, volume, temperature, speed, time, area, energy, pressure, data storage, and more. Fast, accurate, and completely free.
Popular Conversions
- Length: meters ↔ feet, km ↔ miles, cm ↔ inches
- Weight: kg ↔ lbs, grams ↔ ounces
- Volume: liters ↔ gallons, ml ↔ cups
- Temperature: Celsius ↔ Fahrenheit
- Speed: km/h ↔ mph
How It Works
Select categories and units, enter a value — result updates live (JavaScript required). Perfect for cooking, engineering, travel, fitness, or everyday use.
Example: 100 km = 62.14 miles
Bookmark SimpleMetrics for quick access to all converters.