Pounds to kilograms (lbs to kg) for body weight and recipes

Convert pounds to kilograms with the exact definition (1 lb = 0.45359237 kg), plus a table from 1 to 250 lb.

Frompound (lb)

Tokilogram (kg)

0.45

Decimals2 decimals

Formula: kg = lb × 0.45359237

1 lb = 0.45 kg

Common values: pound to kilogram

lb	kg
1 lb	0.45 kg
2 lb	0.91 kg
5 lb	2.27 kg
10 lb	4.54 kg
20 lb	9.07 kg
50 lb	22.68 kg
100 lb	45.36 kg
110 lb	49.9 kg
120 lb	54.43 kg
130 lb	58.97 kg
140 lb	63.5 kg
150 lb	68.04 kg
160 lb	72.57 kg
180 lb	81.65 kg
200 lb	90.72 kg
250 lb	113.4 kg

Quick answers

1 lb to kg: 0.4536 kg
7 lb to kg: 3.18 kg
7.5 lb to kg: 3.4 kg
100 lb to kg: 45.36 kg
200 lb to kg: 90.72 kg
250 lb to kg: 113.4 kg

How it works

One pound is exactly 0.45359237 kg (international yard and pound agreement, 1959), so kilograms = pounds × 0.45359237 with no rounding in the factor. 150 lb is 68.04 kg, 200 lb is 90.72 kg, and a 50 lb bag limit is 22.68 kg.

You need this when a US doctor, gym app or recipe gives pounds and your scale shows kilograms, or when a courier asks for kilograms and the box is marked in pounds. For pounds and ounces (such as a baby's birth weight of 7 lb 8 oz), convert the ounces to a fraction of a pound first: 8 oz = 0.5 lb, so 7.5 lb = 3.40 kg.

How to convert pounds to kilograms

Formula: kg = lb × 0.45359237.

Multiply the pounds by 0.45359237. This factor is the legal definition of the pound, so the result is exact before rounding. Worked example for a 165 lb adult: 165 × 0.45359237 = 74.8427 kg, or 74.8 kg on a scale that shows one decimal.

With pounds and ounces, turn the ounces into a fraction of a pound first (divide by 16): 7 lb 8 oz = 7.5 lb = 3.402 kg. With stone and pounds, multiply the stone by 14 and add the pounds: 11 st 4 lb = 158 lb = 71.67 kg.

Kilograms to pounds: the reverse direction, lb = kg × 2.20462262185

lb to kg chart

Each row is computed with the same exact factor as the converter above and rounded only for display.

Pounds	Kilograms	Grams	Stone and pounds
1 lb	0.45 kg	454 g	0 st 1 lb
5 lb	2.27 kg	2,268 g	0 st 5 lb
10 lb	4.54 kg	4,536 g	0 st 10 lb
25 lb	11.34 kg	11,340 g	1 st 11 lb
45 lb	20.41 kg	20,412 g	3 st 3 lb
50 lb	22.68 kg	22,680 g	3 st 8 lb
100 lb	45.36 kg	45,359 g	7 st 2 lb
110 lb	49.9 kg	49,895 g	7 st 12 lb
120 lb	54.43 kg	54,431 g	8 st 8 lb
130 lb	58.97 kg	58,967 g	9 st 4 lb
140 lb	63.5 kg	63,503 g	10 st 0 lb
150 lb	68.04 kg	68,039 g	10 st 10 lb
160 lb	72.57 kg	72,575 g	11 st 6 lb
170 lb	77.11 kg	77,111 g	12 st 2 lb
180 lb	81.65 kg	81,647 g	12 st 12 lb
190 lb	86.18 kg	86,183 g	13 st 8 lb
200 lb	90.72 kg	90,718 g	14 st 4 lb
220 lb	99.79 kg	99,790 g	15 st 10 lb
250 lb	113.4 kg	113,398 g	17 st 12 lb
300 lb	136.08 kg	136,078 g	21 st 6 lb

Everyday pounds-to-kilograms examples

The 50 lb checked-bag limit printed by US airlines: 50 lb = 22.68 kg.
A "45 lb" barbell plate in a US gym: 45 lb = 20.41 kg.
A body weight from a US doctor's chart or fitness app: 150 lb = 68.04 kg.
One pound of ground beef or butter in a US recipe: 1 lb = 0.454 kg.
The 70 lb maximum weight for most US Postal Service mail: 70 lb = 31.75 kg.

How to use it

Type the value in the first box; the converted value appears in the second box as you type.
Or type in the second box to convert the other way.
Use the Decimals menu to round, and the quick-reference table for common values.

Frequently asked questions

How many kg is 1 lb?

Exactly 0.45359237 kg, or about 454 g.

How do I convert lbs to kg in my head?

Halve the pounds and subtract 10% of the result: 180 lb → 90 − 9 = 81 kg (exact 81.65).

How many kg is 150 lbs?

68.04 kg. The table on this page lists other common body weights.

Is "lbs" a different unit from "lb"?

No. "lb" is the symbol (from the Latin libra); "lbs" is an informal plural. Both mean the avoirdupois pound.

How many kg is 250 lbs?

250 lb = 113.4 kg (250 × 0.45359237).

What is 7 lb or 7.5 lb in kg (baby weight)?

7 lb = 3.18 kg and 7.5 lb (7 lb 8 oz) = 3.4 kg.