About Unit Converter

Convert length, weight, temperature, speed, and data units. Part of the DevTools Surf developer suite. Browse more tools in the Calculators collection.

Use Cases

• Converting API response sizes from bytes to megabytes
• Translating design specs between px, pt, and mm
• Converting server temperatures from Fahrenheit to Celsius
• Switching between miles and kilometers for geolocation features

Tips

• Toggle between metric and imperial with one click
• Use the temperature tab for Celsius-Fahrenheit conversions
• Convert data units like MB to GB for storage calculations

Fun Facts

• NASA's Mars Climate Orbiter was lost in 1999 because one team used metric units while another used imperial, costing $125 million.
• The kilogram was redefined in 2019 using the Planck constant, ending its 130-year dependence on a physical platinum-iridium cylinder in Paris.
• There are exactly 1,852 meters in a nautical mile, derived from one minute of arc along a meridian of the Earth.

FAQ

Which categories?

Length, weight, volume, temperature, speed, time, area, pressure, energy, data (bytes/bits). Covers everyday and engineering conversions.

How many unit types per category?

Length has ~20 (meter, yard, furlong, light-year, ...). Most people need 3-5; the exotic ones are there for science and history.

Data units — decimal or binary?

Both. Toggle between MB (1,000,000 bytes, decimal) and MiB (1,048,576 bytes, binary). Marketing often uses decimal; OSes use binary.

Is conversion accurate?

Yes — uses standard factors. The pound is exactly 0.45359237 kg by international agreement. Other units are similarly pinned to SI references.