Length • Weight • Temperature • Area • Volume • Speed

Universal Unit Converter

Convert measurements instantly across metric, imperial, and US customary unit systems. Real-time multi-unit comparison table.

All Length Conversions for 1

Target UnitSymbolConverted Value
Metersm1
Kilometerskm0.001
Centimeterscm100
Millimetersmm1000
Milesmi0.000621
Yardsyd1.093613
Feetft3.28084
Inchesin39.370079

Metric vs. Imperial & US Customary Systems

The international metric system (SI) is based on decimal multiples of ten (millimeters, meters, kilometers), making calculations straightforward. The US Customary system and British Imperial system use historic fractions (inches, feet, yards, miles, ounces, pounds).

Common Length

1 inch = 2.54 cm exact
1 foot = 0.3048 m
1 mile = 1.609344 km

Common Weight

1 pound (lb) = 453.59 grams
1 kilogram (kg) = 2.20462 lbs
1 stone (UK) = 14 lbs

Temperature

Water Freezes: 0°C = 32°F
Room Temp: 20°C = 68°F
Human Body: 37°C = 98.6°F

Frequently Asked Questions

Multiply the Celsius temperature by 1.8 (or 9/5) and add 32. Formula: °F = (°C × 1.8) + 32.

Yes. A US liquid gallon is equal to 3.785 liters, while a British Imperial gallon is equal to 4.546 liters (approximately 20% larger).