How to Convert cm to Inches, kg to lbs, and Celsius to Fahrenheit
A recipe lists the oven at 200 °C, a furniture listing gives a height in centimeters, and a fitness app wants your weight in pounds. Switching between metric and imperial is a daily annoyance — and doing it in your head invites mistakes (especially with temperature, which is not a simple multiply).
A unit converter handles all three in one place. Here is how.
How to convert cm, kg, and Celsius
QuickWand's free unit converter runs entirely in your browser — type a value and read the result, nothing uploaded.
- Open the unit converter.
- Pick a category — length, weight, or temperature.
- Choose the unit you have and the unit you want (cm → inches, kg → lbs, °C → °F).
- Type your value and read the converted answer instantly. Reverse the units to go the other way.
The math behind each conversion
Knowing the formulas makes the results easy to sanity-check — and two of them are simpler than you might expect.
- cm to inches — Divide by 2.54, because one inch is defined as exactly2.54 cm. So 180 cm ÷ 2.54 ≈ 70.9 in (about 5'11"). Multiply by 2.54 to go back.
- kg to lbs — Multiply by 2.20462. So 70 kg × 2.20462 ≈ 154.3 lbs. Divide by the same number to convert pounds to kilograms.
- Celsius to Fahrenheit — Multiply by 1.8 and add 32. So 20 °C × 1.8 + 32 = 68 °F. To reverse it, subtract 32 first, then multiply by 5/9.
Why temperature is the odd one out
Length and weight are proportional: zero cm is zero inches, and doubling the value doubles the result. Temperature is different because the two scales do not share a zero point — water freezes at 0 °C but 32 °F. That is why the formula has a +32 offset on top of the multiplier. Forgetting the offset is the single most common conversion mistake, which is exactly why a converter is worth using.
A few everyday anchors worth memorizing
- 1 inch = 2.54 cm and 1 foot ≈ 30.5 cm.
- 1 kg ≈ 2.2 lbs— a quick mental estimate.
- 0 °C = 32 °F (freezing) and 100 °C = 212 °F (boiling).
When you need precision — sizing a shipment, following a recipe, or reading a forecast abroad — type the value into the converter and get an exact answer without the mental arithmetic.