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Unit Converter

Convert length, weight, temperature, area, volume, speed, time, and energy units instantly, using exact conversion factors.

Unit Converter

Convert between different units of measurement

Select Category

1 m = 0.001 km

Quick Conversions

1 meter3.28 feet
1 kilometer0.62 miles
1 inch2.54 cm

Features

8 conversion categories
Bidirectional conversion
High precision results
Conversion history

About Unit Converter

The Unit Converter translates measurements between units across eight categories: length, weight, temperature, area, volume, speed, time and energy. Choose a category, pick the From and To units, type a value, and the result appears immediately. It works in both directions, so you can edit either side.

It also keeps a short history of recent conversions and offers quick conversions for common pairs, which is handy when you are working through a list of values, such as converting a recipe, a set of dimensions or a packing list.

How to use the Unit Converter

  1. Select a category, for example length, weight, volume or temperature.
  2. Choose the From unit and the To unit.
  3. Enter a value. The converted result appears straight away.
  4. Use Copy Result to copy it, or Clear All to start over. Recent conversions are listed for reference.

What it can do

Multiple categories

Eight categories: length, weight, temperature, area, volume, speed, time and energy.

Bidirectional

Edit either field and the other updates.

High precision

Uses exact conversion factors and shows precise results.

History and copy

Recent conversions are saved on the page and the result can be copied in one click.

When it is useful

  • Converting kilometres to miles or centimetres to inches for travel and shopping.
  • Switching between Celsius and Fahrenheit for weather and cooking.
  • Translating pounds and kilograms or litres and gallons for shipping and recipes.
  • Checking dimensions on international product specifications.

Good to know

  • US and UK customary units differ in some cases (for example US and imperial gallons). Check which one your source uses.
  • Results are displayed with many digits; round them sensibly for the task at hand.
  • For cooking measures that depend on the ingredient, such as cups to grams, use the Cooking Unit Converter.

Read the guide: Unit Conversion Made Simple

Related tools: Cooking Unit Converter, Currency Converter, BMI Calculator, Percentage Calculator

Frequently Asked Questions

Q.Which unit categories are supported?
Length, weight, temperature, area, volume, speed, time and energy. Choose the category first, then the From and To units.
Q.How accurate are the conversions?
Conversions use standard exact or internationally defined factors, so results are as precise as the numbers you enter.
Q.How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32. For example 20 C x 1.8 + 32 = 68 F. The tool does this automatically.
Q.Why are US and imperial gallons different?
A US gallon is about 3.785 litres and an imperial (UK) gallon is about 4.546 litres. Make sure you choose the right one.
Q.Can I convert cups to grams?
Cups measure volume and grams measure mass, so the answer depends on the ingredient. Use the Cooking Unit Converter for ingredient-specific conversions.
Q.Does it work offline?
Once the page has loaded the maths runs locally in your browser.
Q.Are my conversions stored?
Recent conversions are kept only in the page while you use it.

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