Ans

Unit converter

Mass & weight.

Convert kg to lb, or pick any of the 25 units in the menus. Type in either box and the other follows. Everything on this page is mass rather than weight, which is why a kilogram is still a kilogram on the Moon and a pound-force is somewhere else entirely.

kg → lbExact definition
—
Kilograms to pounds — common values, to 6 significant figures.
kglb
1 kg2.20462 lb
2 kg4.40925 lb
3 kg6.61387 lb
4 kg8.81849 lb
5 kg11.0231 lb
10 kg22.0462 lb
15 kg33.0693 lb
20 kg44.0925 lb
25 kg55.1156 lb
50 kg110.231 lb
75 kg165.347 lb
100 kg220.462 lb
250 kg551.156 lb
500 kg1102.31 lb
1000 kg2204.62 lb
1 kg=2.204622622 lb 1 lb=0.45359237 kg

Definitions

  • The kilogram is the SI base unit of mass, defined since 2019 by fixing the Planck constant rather than by a metal cylinder in Paris.
  • The international avoirdupois pound is exactly 0.453 592 37 kg, agreed in 1959 — which is why pounds and kilograms convert exactly.
  • Everything here is mass, not force. The pound is defined as exactly 0.453 592 37 kg, so pound-to-kilogram conversion is exact.
  • The menus include st + lb and lb + oz, which keep the whole stone whole and put the remainder in pounds — so a value reads 12 st 8.37 lb rather than a decimal.
  • 23 of the 25 units are exact by definition; the rest are conventional or measured values. The display says which kind you are looking at.

How it works

Every value is converted into kilograms and then back out into the unit you asked for. One route covers every pairing in the menus, so an unusual combination is no less accurate than a common one, and adding a unit affects only that unit.

Both boxes are live. Whichever one you last typed in is the source, changing either menu recalculates straight away, and Swap exchanges the units and the values so the number you are reading stays where you are looking.

Display precision limits significant figures rather than decimal places, because one fixed number of decimals is useless across a range this wide. Very large and very small results switch to scientific notation with a proper superscript exponent. The editable box always holds a plain number at full working precision, so you can carry on from either side.

Common questions this answers: how many pounds in a kilogram (2.20462), how many kilograms in a pound (0.453592), and what 1 kg is in pounds (2.20462 lb).

Common conversions

From the maker of Ans — a scientific calculator you can own. Same idea: a proper instrument, nothing in the way.