Unit Converter

Convert length, weight, and volume instantly.

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What Is a Unit Converter?

A unit converter is a tool that changes a measurement from one unit to another within the same category, such as metres to feet, kilograms to pounds, or litres to gallons. Different countries describe measurements in different ways, with many places using the metric system and others using imperial units, so the same length, weight, or volume can appear in several unfamiliar forms depending on where a product, recipe, or instruction came from.

Instead of looking up a formula and working through the maths by hand, where a single misplaced decimal point can spoil the result, you enter a value once and the converter applies the correct relationship between the two units for you. This page covers length, weight, and volume, which are the three categories most people need for travel, cooking, shopping, schoolwork, fitness, and everyday tasks around the home.

How to Use This Unit Converter

  1. Choose a category from the Category dropdown: Length, Weight, or Volume.
  2. Select your starting unit in the From dropdown and the unit you want in the To dropdown.
  3. Type your number into the Value field. The result updates instantly below as you type or change any selection.
  4. Read the converted value in the blue result box, and swap the From and To units any time you need the reverse conversion.

Who Uses a Unit Converter?

Almost anyone runs into unfamiliar units from time to time. Travellers use one to understand distances, luggage limits, and fuel amounts abroad, while home cooks use one to follow recipes written for another country. Students, shoppers comparing imported products, people tracking their weight or fitness, and anyone tackling a DIY project with measurements from an overseas guide will all find a quick converter saves time and prevents guesswork.

Tips for Accurate Conversions

  • Check the category before you convert. Units with similar names can belong to different categories, and a result only makes sense when both units measure the same thing.
  • Double-check which unit is set as From and which is set as To. Swapping them is the most common reason a result looks far too large or far too small.
  • Round sensibly for the task. A recipe or journey distance rarely needs many decimal places, while technical or school work may need the fuller figure shown in the result.

Frequently Asked Questions

Is this unit converter free to use?

Yes. It is completely free, with no signup or account required. Your values are converted in your browser on this page, so nothing you enter is sent to a server or stored.

Which units can I convert?

For length you can convert between metres, kilometres, centimetres, feet, inches, and miles. For weight you can use kilograms, grams, pounds, and ounces, and for volume you can use litres, millilitres, gallons, and fluid ounces.

Why does my result have several decimal places?

Many conversions do not produce a neat whole number, so the result is shown with up to six decimal places. You can round it to fewer places when an approximate figure is good enough for your task.

Can I convert between categories, like kilograms to litres?

No. Kilograms measure weight and litres measure volume, so there is no single fixed conversion between them. A converter can only change units that measure the same type of quantity.