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Metric & Unit Converters

Free, instant unit converters. Convert between metric and imperial units for distance, weight, temperature, length and speed.

Distance

Kilometres to Miles

Convert km to miles instantly with exact conversion factor.

Miles to Kilometres

Convert miles to km using the exact 1.609344 factor.

Temperature

Celsius to Fahrenheit

Convert °C to °F and Kelvin. Includes key reference points.

Fahrenheit to Celsius

Convert °F to °C and Kelvin. Common reference temperatures shown.

Weight

Kilograms to Pounds

Convert kg to lb and stones & pounds. Ideal for body weight.

Pounds to Kilograms

Convert pounds to kg and stones. Uses exact 0.453592 factor.

Kilograms to Stones

Convert kg to stones and pounds — e.g. "10 st 3 lb".

Stones to Kilograms

Enter stones and pounds to get exact kilograms and total pounds.

Length

Metres to Feet & Inches

Convert metres to feet and inches. Also shows decimal feet and cm.

Feet & Inches to Metres

Enter feet and inches to get exact metres and centimetres.

Inches to Centimetres

Convert inches to cm and mm. Exact 2.54 cm per inch.

Centimetres to Inches

Convert cm to decimal inches plus feet & inches breakdown.

Inches to Millimetres

Convert inches to mm and cm. Exact 25.4 mm per inch.

Millimetres to Inches

Convert mm to inches, centimetres and feet. Great for engineering.

Convert inches to decimal feet and feet & inches format.

Convert feet (decimal allowed) to inches, cm and metres.

Speed

Convert miles per hour to kilometres per hour and m/s.

Convert kilometres per hour to miles per hour and m/s.

About Our Metric & Unit Converters

All CalcWhizz unit converters are free, accurate, and GDPR compliant. Calculations run entirely in your browser — no personal data is stored or shared. Every conversion uses internationally standardised factors from the International System of Units (SI), and where definitions are exact (such as 1 inch = 25.4 mm exactly), we use those exact values.

Our converters cover the most commonly needed metric-to-imperial conversions: distance (km and miles), temperature (Celsius and Fahrenheit), weight (kilograms, pounds and stones), length (metres, feet, inches, centimetres and millimetres), and speed (mph and kph).

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Accurate Conversions: All conversion factors used are internationally standardised values from the International System of Units (SI) and are exact where defined. Results are for informational purposes.