1 pound is exactly 0.45359237 kilograms, so 150 lb is 68.0 kg. Fahrenheit is Celsius × 9 ÷ 5 + 32, so 20 °C is 68 °F.
Mass: pounds to kilograms
Multiply pounds by 0.45359237. Rounding the factor to 0.45 loses 0.8% and the error grows with the number: 150 lb becomes 67.5 kg instead of 68.0 kg.
To go back, divide kilograms by 0.45359237.
Temperature: Celsius to Fahrenheit
Multiply by 9, divide by 5, add 32. The scales do not share a zero, so doubling and adding 30 is only a rough check near everyday temperatures.
Body temperature of 37 °C is 98.6 °F and boiling water at sea level, 100 °C, is 212 °F.
A habit that prevents errors
Write the unit next to every number, convert once at the end and sanity-check the size of the result. The converters on so67 show the factor they use.
| °C | °F |
|---|---|
| 0 | 32.0 |
| 20 | 68.0 |
| 37 | 98.6 |
| 100 | 212.0 |
FAQ
How many pounds is one kilogram?+
About 2.2046 pounds, since 1 lb is 0.45359237 kg.
At what temperature are Celsius and Fahrenheit equal?+
At −40.