Multiply lb by 0.45359237 to get kg. The displayed factor is rounded; the calculator uses the full stored conversion factor.
Use avoirdupois pounds, as used for body and package weights. Troy weights follow a different system.
Worked example
150 lb = 68.0388555 kg. To reverse it, enter the unrounded output and select Swap units. Round only the final result; converting an already-rounded result back may not reproduce the original exactly.
Conversion table in both directions
lb and kg reference values
Input
lb → kg
kg → lb
1
0.45359237
2.2046226218
2
0.90718474
4.4092452437
5
2.26796185
11.0231131092
10
4.5359237
22.0462262185
20
9.0718474
44.092452437
25
11.33980925
55.1155655462
50
22.6796185
110.2311310924
100
45.359237
220.4622621849
500
226.796185
1,102.3113109244
1000
453.59237
2,204.6226218488
Last updated . Results are estimates for informational purposes only.