Unit Converter
Convert between units of measurement for length, mass, time, temperature, and more.
1 m = 3.280839895 ft
All Length Conversions
Quick Reference: Length
1 inch = 2.54 cm | 1 foot = 30.48 cm | 1 mile = 1.609 km | 1 nautical mile = 1.852 km
1 light year = 9.461 × 10¹⁵ m | 1 parsec = 3.086 × 10¹⁶ m
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The Unit Converter is a comprehensive tool for converting between units of measurement across 14 physics categories. Convert length (meters, feet, miles, light years), mass (kilograms, pounds, ounces), temperature (Celsius, Fahrenheit, Kelvin), speed (m/s, km/h, mph, Mach), and many more.
Additional categories include area, volume, pressure, energy, power, force, frequency, digital storage (bytes to terabytes), and angles. Each conversion shows all related units at once with one-click copy. All calculations run entirely in your browser with no data sent to any server.
FAQ
To convert Celsius to Fahrenheit, multiply by 9/5 (or 1.8) and add 32. For example, 25°C = (25 × 1.8) + 32 = 77°F. The Unit Converter handles this automatically in the Temperature category.
KB (kilobyte) uses the decimal system where 1 KB = 1,000 bytes. KiB (kibibyte) uses the binary system where 1 KiB = 1,024 bytes. Storage manufacturers often use KB while operating systems typically use KiB, which is why a '500 GB' drive shows less in your OS.
The speed of light in a vacuum (c) is exactly 299,792,458 meters per second, or approximately 1.08 billion km/h (670.6 million mph). It is the universal speed limit according to Einstein's theory of relativity.
Mass measures the amount of matter in an object (measured in kg), while weight is the force of gravity on that mass (measured in Newtons). On Earth, a 1 kg mass weighs about 9.8 N. The Unit Converter treats everyday 'weight' units like pounds as mass for practical conversions.
One meter equals approximately 3.281 feet, or exactly 3 feet and 3.37 inches. Conversely, one foot equals 0.3048 meters exactly. The meter is defined as the distance light travels in 1/299,792,458 of a second.
Absolute zero is the lowest possible temperature: 0 Kelvin, -273.15°C, or -459.67°F. At this temperature, atoms have minimal motion and no heat energy can be extracted. It has never been achieved in practice, though scientists have gotten extremely close.