Conversion Guide

Understand unit conversion.

A simple guide to understanding common units, conversion formulas and how to get accurate results.

01

What is Unit Conversion?

Unit conversion is the process of changing a measurement from one unit to another while keeping the same quantity.

For example, a distance can be expressed in kilometers, miles, meters or feet. The value changes, but the actual distance stays the same.

Example 1 kilometer = 0.621371 miles
02

Length Conversion

Length measures the distance between two points. Common units include meters, kilometers, centimeters, inches, feet, yards and miles.

Conversion Result
1 kilometer → miles 0.621371 mi
1 mile → kilometers 1.60934 km
1 meter → feet 3.28084 ft
1 inch → centimeters 2.54 cm
Open Length Converter →
03

Weight & Mass Conversion

Weight and mass conversions are commonly used in cooking, shopping, fitness, science and everyday life.

Kilograms → Pounds kg × 2.20462 = lb
Pounds → Kilograms lb × 0.453592 = kg
Open Weight Converter →
04

Temperature Conversion

The most common temperature scales are Celsius, Fahrenheit and Kelvin.

Celsius → Fahrenheit (°C × 9/5) + 32
Fahrenheit → Celsius (°F − 32) × 5/9
Celsius → Kelvin °C + 273.15
Open Temperature Converter →
05

Area Conversion

Area measures the amount of surface covered by a space. Common units include square meters, square feet, acres and hectares.

Example 1 square meter = 10.7639 square feet
Open Area Converter →
06

Volume Conversion

Volume describes how much space an object or container occupies. Liters, milliliters, gallons and cubic meters are common units.

Conversion Result
1 liter → US gallons 0.264172 gal
1 US gallon → liters 3.78541 L
1 liter → milliliters 1000 ml
Open Volume Converter →
07

Speed Conversion

Speed tells us how quickly something moves. Kilometers per hour and miles per hour are two commonly used speed units.

km/h → mph km/h × 0.621371
mph → km/h mph × 1.60934
Open Speed Converter →
08

Conversion Tips

01

Check the units

Always verify the starting and target units before converting.

02

Keep precision

Avoid rounding too early when performing multiple calculations.

03

Use the right system

Know whether your calculation uses metric or imperial units.

04

Double-check results

For important calculations, verify your result using another method.

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