Unit Converters

Unit Converters for Metric & Imperial Measurements

Use free UK-friendly converters for length, weight, temperature, volume and speed — including cm to inches, kg to stone, litres to pints, Celsius to Fahrenheit and mph to km/h.

Metric to imperial Imperial to metric UK everyday units Quick formulas

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Unit Converter

Convert common metric and imperial measurements in one place. Choose a category, enter an amount, pick your from and to units, then see the converted result with a clear formula note.

Length Weight Temperature Volume Speed

Example result 10 kg ≈ 1 st 8.0 lb Useful for UK everyday conversions where metric and imperial units are both commonly used. Use unit converter

Unit converter calculators

Choose the converter that matches what you need to work out, from everyday length and weight conversions to speed, volume and temperature.

Primary tool Unit Converter Convert length, weight, temperature, volume and speed in one broad metric and imperial converter. Length Length Converter Convert millimetres, centimetres, metres, kilometres, inches, feet, yards and miles. Weight Weight Converter Convert grams, kilograms, ounces, pounds and stone, with UK-friendly stone and pounds results. Temperature Temperature Converter Convert Celsius, Fahrenheit and Kelvin using clear temperature formulas. Volume Volume Converter Convert millilitres, litres, teaspoons, tablespoons, pints, gallons, cups and fluid ounces. Speed Speed Converter Convert mph, km/h, metres per second and knots for road, travel and sport examples.

Common UK conversion jobs

Unit Converters is built around quick everyday conversions, especially where UK users switch between metric and imperial measurements.

Convert body and product weights Use the weight converter for kilograms, grams, pounds, ounces and stone.

Switch between road and travel units Use length and speed converters for miles, kilometres, mph and km/h.

Check temperature and volume Use temperature and volume tools for Celsius, Fahrenheit, litres, pints and gallons.

Unit conversion note

Most conversions use fixed conversion factors, but the way you round the answer depends on the job. A DIY measurement may need more precision than a quick everyday estimate.

Unit conversion guides

Read practical guides that explain metric and imperial units, common UK conversions and how to round converted measurements sensibly.

Guide Metric to Imperial Conversions Explained Understand the common formulas behind kg to pounds, cm to inches, miles to km and litres to pints. UK conversions Common UK Measurement Conversions See the conversions UK users most often need for height, weight, roads, property, cooking and shopping. How-to How to Convert Length, Weight and Volume Units Learn how conversion factors work and how to avoid common multiply/divide mistakes. Explanation Metric vs Imperial Units: What Is the Difference? Compare the two measurement systems and where each one is commonly seen in the UK. Accuracy Rounding Converted Measurements Without Losing Accuracy Choose sensible decimal places for DIY, cooking, travel, health and everyday estimates.

Unit converter glossary

Quick definitions for the measurement terms that appear across metric, imperial and everyday UK conversions.

GlossaryMetric systemA decimal-based measurement system using units such as metres, grams and litres. GlossaryImperial unitsUnits such as inches, feet, miles, pounds, stone, pints and gallons. GlossaryConversion factorThe multiplier used to convert a value from one unit to another. GlossaryMetreThe standard metric unit of length. GlossaryCentimetreOne hundredth of a metre, commonly used for height and small measurements. GlossaryKilogramThe main metric unit used for everyday weight and mass. GlossaryPoundAn imperial weight unit often written as lb. GlossaryLitreA metric volume unit used for liquids and capacity. GlossaryCelsiusA temperature scale where water freezes at 0°C and boils at 100°C. GlossaryFahrenheitA temperature scale still seen in some weather, cooking and international contexts.

Convert everyday measurements faster

Start with the all-in-one unit converter, or jump straight into length, weight, temperature, volume or speed depending on the measurement you need.

Use unit converter Convert weight