# Unit Converter: cm to Inches, kg to lbs, °C to °F and More

Convert cm to inches, kg to lbs, °C to °F, litres to gallons and km/h to mph instantly, with every unit at once and a quick reference table.

Interactive tool: https://lookup.sg/tools/unit-converter

## How this works
Every conversion goes through a base unit (metres, kilograms, litres, metres per second) using exact legal definitions: 1 inch is 2.54 cm, 1 foot is 30.48 cm, 1 mile is 1.609344 km, 1 pound is 0.45359237 kg, 1 ounce is 28.349523125 g and 1 US gallon is 3.785411784 litres. A UK gallon is 4.54609 litres and a nautical mile is 1,852 m.

Temperature is not a simple ratio: °F = °C × 9 ÷ 5 + 32, and kelvin = °C + 273.15. Cooking measures use metric spoons and cups (5 ml teaspoon, 15 ml tablespoon, 250 ml cup), so check whether an American recipe means US cups (about 237 ml).

Results are rounded to about 6 significant figures, which is more precision than any everyday use needs. Heights in centimetres are also shown in feet and inches.

## FAQs
### How many inches is 170 cm?
170 cm is 66.93 inches, or 5 ft 6.9 in. Divide centimetres by 2.54 to get inches, and divide inches by 12 for feet.

### How do I convert kg to lbs?
Multiply by 2.20462. 1 kg is 2.20462 lb, so 65 kg is 143.3 lb. To go the other way, 1 lb is 0.453592 kg.

### What is 32 °C in Fahrenheit?
89.6 °F. Multiply by 9, divide by 5 and add 32. Normal body temperature of 37 °C is 98.6 °F.

### What is 90 km/h in mph?
55.92 mph. Divide km/h by 1.609344 to get miles per hour.

## Sources
- [NIST: Guide for the Use of the International System of Units (SP 811), conversion factors](https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors)

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