Unit Converter - mm to inches, kg to lbs, °C to °F

From

Common Length Conversions

10 mm = 0.394 in

25 mm = 0.984 in

1 inch = 25.4 mm

1 foot = 0.305 m

1 meter = 3.281 ft

1 mile = 1.609 km

From

Common Weight Conversions

1 kg = 2.205 lb

1 pound = 0.454 kg

1 ounce = 28.35 g

100 g = 3.527 oz

1 stone = 6.350 kg

70 kg = 11.02 st

From

Common Temperature Conversions

0°C = 32°F

20°C = 68°F

100°C = 212°F

32°F = 0°C

70°F = 21.1°C

273 K = 0°C

From

Common Area Conversions

1 m² = 10.76 ft²

1 ft² = 0.093 m²

1 acre = 4047 m²

From

Common Volume Conversions

1 liter = 0.264 gal

1 gallon = 3.785 L

500 ml = 16.9 fl oz

Understanding Unit Conversions

Why Unit Conversion Matters

Different countries and industries use different measurement systems. The metric system (SI units) is used by most of the world, while the imperial system remains common in the United States and UK. Being able to convert between these systems is essential for international trade, engineering, construction, cooking, and everyday life.

Metric vs Imperial Systems

Metric System (SI): Based on powers of 10, making conversions simple. Used by most countries worldwide. Units include meters, liters, grams, and Celsius.

Imperial System: Based on historical measurements. Common in the US and partially in the UK. Units include feet, gallons, pounds, and Fahrenheit.

Common Conversion Factors

Length: 1 inch = 25.4mm, 1 foot = 30.48cm, 1 mile = 1.609km

Weight: 1 pound = 0.4536kg, 1 ounce = 28.35g, 1 stone = 6.35kg

Temperature: °F = (°C × 9/5) + 32, °C = (°F - 32) × 5/9

Volume: 1 gallon (US) = 3.785L, 1 pint (UK) = 568ml

Practical Applications

Automotive: Engine displacement (liters vs cubic inches), torque specifications
Construction: Material dimensions, area calculations, volume estimates
Cooking: Recipe conversions between metric and cups/ounces
Travel: Speed limits, distances, fuel efficiency
Shopping: Comparing product sizes and prices across regions

Tips for Accurate Conversions

Always double-check critical measurements - errors can be costly
Use appropriate precision - don't claim false accuracy with too many decimal places
Remember that some conversions (like temperature) aren't simple multiplications
Be aware of US vs UK differences (e.g., US gallon vs UK gallon)
Keep a reference guide handy for frequently used conversions