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Unit Converter

Convert between units of length, weight, temperature, volume, area, speed, and time

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3,280839895

1 Meters = 3,28084 Feet

Common Conversions

Length

  • • 1 inch = 2.54 cm
  • • 1 foot = 30.48 cm
  • • 1 yard = 0.914 m
  • • 1 mile = 1.609 km
  • • 1 meter = 3.281 feet

Weight

  • • 1 ounce = 28.35 g
  • • 1 pound = 0.454 kg
  • • 1 kg = 2.205 lbs
  • • 1 ton = 1000 kg
  • • 1 stone = 6.35 kg

Temperature

  • • 0°C = 32°F
  • • 100°C = 212°F
  • • 20°C = 68°F
  • • 0°C = 273.15 K
  • • -40°C = -40°F

Volume

  • • 1 gallon = 3.785 L
  • • 1 quart = 0.946 L
  • • 1 cup = 236.6 mL
  • • 1 fl oz = 29.57 mL
  • • 1 liter = 33.81 fl oz

Area

  • • 1 acre = 4047 m²
  • • 1 hectare = 10,000 m²
  • • 1 sq ft = 0.093 m²
  • • 1 sq mile = 2.59 km²
  • • 1 sq yard = 0.836 m²

Speed

  • • 1 mph = 1.609 km/h
  • • 1 km/h = 0.621 mph
  • • 1 knot = 1.852 km/h
  • • 60 mph = 96.56 km/h
  • • 100 km/h = 62.14 mph
Understanding Unit Conversions

Unit conversion is the process of converting a measurement from one unit to another. Different countries and industries use different measurement systems, making conversions essential for international communication, science, cooking, construction, and daily life.

Metric vs Imperial Systems

Metric System (SI)

Used by most countries worldwide. Based on powers of 10, making conversions simple. Units: meters, kilograms, liters, Celsius.

Imperial System

Primarily used in the United States. Based on historical measurements. Units: feet, pounds, gallons, Fahrenheit.

Conversion Tips

  • Memorize common conversions: 1 inch ≈ 2.5 cm, 1 kg ≈ 2.2 lbs, 1 mile ≈ 1.6 km
  • Use dimensional analysis: Multiply by conversion factors to cancel units
  • Check reasonableness: Does the result make sense? (e.g., meters should be larger numbers than kilometers)
  • Temperature is different: Celsius and Fahrenheit use formulas, not simple multiplication
  • Precision matters: Use appropriate decimal places for your application

Pro Tip: When traveling internationally, remember these quick conversions: 0°C = 32°F (freezing), 20°C = 68°F (room temp), 100 km/h = 62 mph, 1 kg = 2.2 lbs.

Frequently Asked Questions

Why are there different measurement systems?

Historical reasons. The metric system was developed in France in the 1790s for standardization. The imperial system evolved from British measurements. Most countries adopted metric for its simplicity, but the US retained imperial for tradition and conversion costs.

How do I convert Celsius to Fahrenheit?

Formula: °F = (°C × 9/5) + 32. Example: 20°C = (20 × 9/5) + 32 = 68°F. To convert Fahrenheit to Celsius: °C = (°F - 32) × 5/9. Example: 68°F = (68 - 32) × 5/9 = 20°C.

What's the difference between weight and mass?

Mass is the amount of matter (measured in kg or lbs), constant everywhere. Weight is the force of gravity on mass (measured in newtons), varies by location. In everyday use, we often use "weight" to mean mass.

Why is a US gallon different from a UK gallon?

Historical divergence. A US gallon is 3.785 liters, while a UK (imperial) gallon is 4.546 liters. This affects fuel economy comparisons—30 mpg (US) = 36 mpg (UK). Always specify which gallon when comparing.

How accurate are these conversions?

Very accurate. This calculator uses standard conversion factors from international standards organizations. Results are rounded to 10 decimal places for display, which is more than sufficient for any practical application.

What's the easiest way to estimate metric conversions?

Quick estimates: 1 meter ≈ 1 yard, 1 kg ≈ 2 lbs, 1 liter ≈ 1 quart, 30 cm ≈ 1 foot. For temperature: double Celsius and add 30 for rough Fahrenheit (e.g., 20°C → 40 + 30 = 70°F, actual is 68°F).