Unit Converter Live
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How Do I Convert Units?
Pick a category, choose the unit you have and the unit you want, then type the value; the answer appears as you type, and you can type in either box to convert backwards. The key factors: 1 inch = 2.54 cm, 1 kg = 2.205 lb, 1 mile = 1.609 km, and °F = °C × 9/5 + 32.
cm to Feet and Inches (Height)
| cm | Inches | Feet and inches |
|---|---|---|
| 150 | 59.1 | 4 ft 11 in |
| 155 | 61.0 | 5 ft 1 in |
| 160 | 63.0 | 5 ft 3 in |
| 165 | 65.0 | 5 ft 5 in |
| 170 | 66.9 | 5 ft 7 in |
| 175 | 68.9 | 5 ft 9 in |
| 180 | 70.9 | 5 ft 11 in |
| 185 | 72.8 | 6 ft 1 in |
| 190 | 74.8 | 6 ft 3 in |
Divide centimetres by 2.54 to get inches, then divide by 12 for feet; the remainder is inches. Feet-and-inches values are rounded to the nearest inch.
kg to lbs
| kg | 1 | 5 | 10 | 50 | 60 | 70 | 80 | 100 |
|---|---|---|---|---|---|---|---|---|
| lb | 2.20 | 11.02 | 22.05 | 110.23 | 132.28 | 154.32 | 176.37 | 220.46 |
Multiply kilograms by 2.205 for pounds, or divide pounds by 2.205 for kilograms.
Celsius to Fahrenheit and km to Miles
| °C | °F | km | Miles |
|---|---|---|---|
| −10 | 14 | 1 | 0.62 |
| 0 | 32 | 5 | 3.11 |
| 20 | 68 | 10 | 6.21 |
| 25 | 77 | 21.1 (half marathon) | 13.11 |
| 30 | 86 | 42.2 (marathon) | 26.22 |
| 37 | 98.6 | 100 | 62.14 |
What You Can Convert
- Length: metres, kilometres, centimetres, millimetres, miles, yards, feet, inches, nautical miles.
- Weight: kilograms, grams, milligrams, pounds, ounces, metric tonnes, stone.
- Temperature: Celsius, Fahrenheit, Kelvin.
- Area, volume and speed: m², km², ft², acres, hectares; litres, US and UK gallons, cups, pints; km/h, mph, m/s, knots.
- Data, time and pressure: bytes to terabytes; seconds to years; pascals, bar, PSI and atmospheres.
The data category uses 1 KB = 1,024 bytes, the binary convention used by most operating systems. Drive makers often use 1 KB = 1,000 bytes, which is why a new drive can show less space than its label.
Working out your BMI? The BMI calculator takes kg or lb directly. For maths beyond conversions, use the scientific calculator or the percentage calculator.
How to Use the Unit Converter
- Choose what you are converting, such as length, weight, temperature or data size.
- Type the value in the From box and pick its unit.
- Pick the unit you want in the To box; the answer appears instantly.
- Type in the To box instead to convert in the other direction.
How the Unit Converter Works
Most conversions are a single multiplication by a fixed, defined factor: 1 inch is exactly 2.54 cm, 1 kilogram is about 2.20462 pounds and 1 mile is about 1.609 km. Temperature is the exception, because the scales start from different zero points, so it uses a formula instead: °F = °C × 9/5 + 32, and °C = (°F − 32) × 5/9. Data sizes use the binary convention common in operating systems, where 1 GB is 1,024 MB.
Who Uses the Unit Converter?
- Travellers and online shoppers: check a height in feet, a weight in pounds or a temperature in Fahrenheit.
- Students: confirm homework conversions and see the factor behind them.
- Cooks and DIYers: switch recipe weights or measurements between metric and imperial.
How the Unit Converter Saves You Time
Looking up a factor, multiplying on a phone and rounding takes a minute and is easy to get wrong by a power of ten. Here the answer appears as you type, in both directions, with no factor to remember.
Frequently Asked Questions
How do I convert cm to inches?
How do I convert kg to lbs?
How do I convert Celsius to Fahrenheit?
How do I convert km to miles?
Can I convert in both directions?
Why is a gigabyte 1,024 megabytes here?
Last updated: September 2026