Unit Converter

Convert between different units of measurement instantly.

Conversion Settings

Unit Converter Online Free - Convert Length Weight Temperature

Free unit converter online. Convert length, weight, temperature, volume, area, speed, and more. 50+ unit types with instant metric to imperial conversion.

🔄 Unit Converter - Convert Measurements Online Free

Convert length, weight, temperature, volume, area & more. Metric, imperial, US customary units. Instant results!

Length

Meter, km, mile, yard, feet

Weight

Kg, gram, pound, ounce, ton

Temperature

Celsius, Fahrenheit, Kelvin

Volume

Liter, gallon, ml, cubic meter

Supported Conversions

Length & Distance
  • Meter (m), Kilometer (km), Centimeter (cm), Millimeter (mm)
  • Mile, Yard, Foot, Inch
  • Nautical Mile, Light Year, Astronomical Unit
  • Micron, Nanometer, Angstrom
Weight & Mass
  • Kilogram (kg), Gram (g), Milligram (mg)
  • Pound (lb), Ounce (oz), Stone
  • Metric Ton, US Ton, Imperial Ton
  • Carat, Grain, Pennyweight
Temperature
  • Celsius (°C) ↔ Fahrenheit (°F) ↔ Kelvin (K)
  • Formula: °F = (°C × 9/5) + 32
  • Formula: K = °C + 273.15
  • Réaumur, Rankine, Newton, Delisle, Rømer
Volume & Capacity
  • Liter, Milliliter, Cubic Meter (m³)
  • Gallon (US/UK), Quart, Pint, Cup
  • Fluid Ounce, Tablespoon, Teaspoon
  • Barrel (Oil), Bushel, Peck

Unit Converter Use Cases

Daily Life
  • Cooking recipes: cups to ml, tbsp to ml
  • Height conversion: feet/inches to cm
  • Weight: kg to lbs for travel, fitness
  • Temperature: °C to °F for weather forecasts
Education
  • Physics/Chemistry problems: SI units conversion
  • Math homework: metric to imperial
  • Science lab measurements
  • Geography: distance, area calculations
Construction & DIY
  • Blueprints: inches to mm, feet to meters
  • Lumber: board feet to cubic meters
  • Paint coverage: sq ft to sq meters
  • Concrete: cubic yards to cubic meters
Travel & Sports
  • Distance: miles to km for road trips
  • Fuel economy: MPG to L/100km
  • Speed: mph to km/h
  • Running pace: min/mile to min/km

Frequently Asked Questions

High precision calculations:

  • Standard Factors: Uses internationally accepted conversion factors
  • Precision: Up to 10 decimal places for accuracy
  • Rounding: Results rounded appropriately for practical use
  • Scientific Notation: Very large/small numbers displayed properly

Important volume differences:

  • US Liquid Gallon: 3.785 liters
  • UK (Imperial) Gallon: 4.546 liters (20% larger!)
  • US Dry Gallon: 4.405 liters (rarely used)
  • Impact: Fuel economy differs significantly (MPG US vs MPG UK)

Benefits

Why Use Unit Converter?
  • Universal Understanding: Bridge metric and imperial systems
  • Error Prevention: Accurate conversions prevent costly mistakes
  • Time-Saving: Instant results vs manual calculation
  • Educational: Learn relationships between units
  • International Communication: Work across measurement systems
Tool Features
  • 50+ Units: Comprehensive coverage across categories
  • Real-Time: Instant conversion as you type
  • Bi-Directional: Convert both ways seamlessly
  • Mobile-Friendly: Perfect on phones, tablets, desktops
  • 100% Free: Unlimited conversions, no registration

Convert Units Now!

Transform measurements instantly—free forever!