140+ units in 14 categories, from length and weight to data size and fuel economy Traditional units from Vietnam (sào, mẫu, lượng, chỉ), China, Japan and Korea See every unit at once, with exact formulas and adjustable precision Shareable links that keep the category, units and value

Unit Converter Online - Length, Weight, Temperature, Area & More

What is a unit converter?

A unit converter translates a measurement from one unit to another, for example kilometers to miles, kilograms to pounds or Celsius to Fahrenheit. This tool shows a value in every unit of a category at once and uses exact international definitions such as 1 inch = 2.54 cm and 1 pound = 0.45359237 kg.

Features

• 140+ units in 14 categories, from length and weight to data size and fuel economy
• Traditional units from Vietnam (sào, mẫu, lượng, chỉ), China, Japan and Korea
• See every unit at once, with exact formulas and adjustable precision
• Shareable links that keep the category, units and value

Fast and private

All calculations happen locally in your browser. Nothing is sent to a server, so the converter also works offline once the page has loaded.

Exact factors, 100% client-side.

How to use the Unit Converter

1
Pick a category tab such as length, mass, temperature, area or data size.
2
Type a value and choose the "from" and "to" units. Decimal commas and thousand separators like 1,000.5 or 1.000,5 are understood.
3
Read the result, the formula line (for example 1 mile = 1.609344 km) and adjust the number of significant digits if you need more precision.
4
Scroll down to see the value in every unit of the category at once, click a row to use it as the new input, or copy the page link to share the exact conversion.

Practical examples

Cooking and recipes

A US recipe asks for 2 cups of flour and 350 °F. Convert cups to milliliters and Fahrenheit to Celsius (about 177 °C) to follow it with metric kitchen tools.

Buying land or an apartment

Listings in Vietnam use sào or công, in Japan tsubo and in Korea pyeong. Convert them to square meters to compare prices per m² across markets.

Data and bandwidth

A "1 TB" drive shows about 931 GiB in your operating system because vendors use decimal units and the OS uses binary ones. The data category shows both.

Travel and fitness

Convert running pace distances from miles to kilometers, body weight from pounds to kilograms or fuel economy from mpg to L/100 km.

Frequently asked questions

How accurate are the conversions?+

The tool uses exact international definitions where they exist, such as 1 inch = 2.54 cm and 1 pound = 0.45359237 kg. Results are then rounded to the number of significant digits you choose.

Why does temperature not show a simple factor?+

Celsius, Fahrenheit and Kelvin have different zero points, so the conversion includes an offset, not just a multiplication. For example °F = °C × 9/5 + 32.

What is the difference between GB and GiB?+

GB (gigabyte) is 1,000,000,000 bytes, GiB (gibibyte) is 1,073,741,824 bytes. Storage vendors use GB, while Windows reports sizes in GiB but labels them GB.

Are traditional Asian units exact?+

Some, like the Japanese tsubo (400/121 m²) and the Vietnamese gold lượng (37.5 g), have fixed modern definitions. Others such as the sào differ by region, so the tool lists each regional value separately.

Unit Converter

Common conversions