Conversion Calculators
Browse our collection of free online conversion calculators — designed to convert between units of length, weight, and measurement instantly. Fast, accurate, and mobile-friendly with no sign-up required. Whether you’re converting metric to imperial or imperial to metric, our tools handle the calculation for you.
Our Free Conversion Calculators
- CM to Inches Calculator — Convert centimetres to inches instantly
- Inches to CM Calculator — Convert inches to centimetres instantly
- KG to LBS Calculator — Convert kilograms to pounds instantly
- LBS to KG Calculator — Convert pounds to kilograms instantly
Why Metric and Imperial Conversions Matter
The world uses two major measurement systems — the metric system (used in most of the world, including Europe, Asia, and Australia) and the imperial system (primarily used in the United States, with partial use in the UK). Navigating between them is a daily need for millions of people: checking your weight from a US health app, reading a UK clothing size in centimetres, buying materials from an international supplier, or following a recipe from another country.
Our conversion calculators eliminate the mental maths and give you accurate results in both directions instantly.
Quick Conversion Reference
| Metric | Imperial | Conversion Factor |
|---|---|---|
| 1 centimetre | 0.3937 inches | ÷ 2.54 |
| 1 inch | 2.54 centimetres | × 2.54 |
| 1 kilogram | 2.2046 pounds | × 2.2046 |
| 1 pound | 0.4536 kilograms | ÷ 2.2046 |
| 1 metre | 39.37 inches / 3.281 feet | × 3.281 for feet |
| 1 foot | 30.48 centimetres | × 30.48 |
How to Convert Centimetres to Inches
To convert centimetres to inches, divide the value in centimetres by 2.54. For example, 180 cm ÷ 2.54 = 70.87 inches (approximately 5 feet 11 inches). This conversion is used in clothing sizes, screen dimensions, height comparisons, and DIY measurements. Use our CM to Inches Calculator to convert any value instantly.
How to Convert Kilograms to Pounds
To convert kilograms to pounds, multiply the value in kg by 2.2046. For example, 70 kg × 2.2046 = 154.32 lbs. This is particularly useful for gym and fitness tracking, comparing medical readings between countries, and understanding product weights in international shipping. Use our KG to LBS Calculator for instant conversion.
Common Conversion Use Cases
- Height and clothing — Converting your height to inches for US clothing or shoe size charts
- Fitness and health — Reading body weight in pounds vs kilograms across different apps and scales
- DIY and construction — Converting between metric and imperial measurements for materials
- Cooking and baking — Scaling recipes that use different unit systems
- Shipping and retail — Converting product weights for international orders and listings
- Travel — Understanding road signs, speed limits, and distances when moving between countries
Frequently Asked Questions
How many cm is 5 feet?
5 feet = 60 inches = 152.4 centimetres. To convert feet and inches to cm, convert feet to inches first (multiply by 12), add any extra inches, then multiply the total by 2.54. Use our Inches to CM Calculator to do this automatically.
How many pounds is 100 kg?
100 kg = 220.46 lbs. To convert kg to pounds, multiply by 2.2046. For the reverse, use our LBS to KG Calculator.
Why are there two measurement systems?
The imperial system evolved historically in Britain and was adopted by its colonies including the United States. The metric system was developed in France during the late 18th century and has since been adopted internationally as the global standard for science and commerce. The UK uses a mix of both — road distances in miles, height in feet and inches, but weight in kilograms in medical settings.
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