SI Units (International System)

The globally accepted standard system of measurement. Base units include meter (m), kilogram (kg), and second (s).

The measurement system used in the US and UK, including feet, inches, miles, pounds, ounces, and gallons.

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unit converter,

Unit Converter

Convert 150+ units of length, weight, temperature, area, and volume instantly.
See all conversions in one view.

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5 Categories

Length, Weight, Temperature, Area, Volume

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Real-Time

All units updated as you type

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Global Units

Metric, Imperial & Japanese units

Enter a value

Select unit

🔒 All conversions happen in your browser.

about,

About

A free online tool that instantly converts 150+ units across length, weight, temperature, area, and volume. It converts your input value to all available units at once, making comparison effortless.

Supports Metric (SI), Imperial (US/UK), and traditional Japanese units. Ideal for cooking, DIY projects, travel, and academic study.

how to use,

How to Use

STEP 1

Select a Category

Click one of the category tabs: Length, Weight, Temperature, Area, or Volume.

STEP 2

Enter Value & Unit

Type a number and select the input unit from the dropdown. Results update in real time.

STEP 3

Copy Results

All unit conversions appear in a grid. Click the copy icon to copy any value to your clipboard.

glossary,

Glossary

SI Units (International System): The globally accepted standard system of measurement. Base units include meter (m), kilogram (kg), and second (s).
Imperial Units: The measurement system used in the US and UK, including feet, inches, miles, pounds, ounces, and gallons.
Japanese Traditional Units: Traditional Japanese units such as shaku (尺) and tsubo (坪) for length and area, and kan (貫) for weight.
Kelvin (K): The absolute temperature scale used in science. 0 K = −273.15 °C.
Fahrenheit (°F): Temperature scale used in the US. Water freezes at 32 °F and boils at 212 °F.
Hectare (ha): Area unit for farmland and forests. 1 ha = 10,000 m².
Gallon: Volume unit with two variants: US gallon (≈ 3.785 L) and UK gallon (≈ 4.546 L).
Tsubo (坪): Japanese area unit. 1 tsubo ≈ 3.306 m². Commonly used for residential floor space.

faq,

FAQ

Q.Why does temperature conversion use a different formula?: Temperature scales have offset starting points, so they cannot be converted with simple multiplication alone. Example: °C → °F uses (°C × 9/5) + 32. This tool implements all temperature formulas correctly.
Q.Are Japanese traditional units included?: Yes. Length: shaku, ken, jo, ri. Area: tsubo, tatami, tan, cho. Weight: monme, kin, kan.
Q.Is my data sent to a server?: No. All calculations are performed in your browser using JavaScript.
Q.What cooking units are supported?: Teaspoon (tsp), tablespoon (tbsp), cup, pint, quart, gallons, and fluid ounce (fl oz) are all included in the Volume category.