How this tool works
Six conversions between the pairs people look up most often: metres and feet, kilograms and pounds, Celsius and Fahrenheit. The result is rounded to two decimal places.
The factors are the exact international definitions — one foot is 0.3048 metres, one pound is 0.45359237 kilograms — so the conversions agree with any standards reference. Temperature is the odd one out: length and mass conversions are simple multiplication, but Celsius and Fahrenheit have different zero points as well as different degree sizes, which is why the formula multiplies and then adds. Rounding happens once, at display time, so no error accumulates.
Reading a converted figure
- Two decimal places is a display choice, not a precision claim: the underlying arithmetic keeps full precision. If your input was measured to the nearest centimetre, the two decimals in the output are not meaningful.
- Pounds here means the avoirdupois pound: the everyday one, 0.45359237 kg exactly. Troy pounds, used for precious metals, are different and are not offered.
- Temperature differences convert differently from temperatures: a rise of 10 °C is a rise of 18 °F, not 50 °F. The formula here converts a point on the scale, which is what you want for a reading and not for a change.
- Check which foot: the international foot is used here. The US survey foot, still met in older land records, differs by about two parts per million — irrelevant for a room, material over a county.