20 lb = 9.07185 kg (pound → kilogram)
20 lb = 9.07185 kg
20 pounds (lb) equals 9.07185 kilograms (kg). The conversion uses the exact factor 0.453592: 20 × 0.453592 = 9.07185.
Kilograms = Pounds × 0.453592How 20 pounds compares to its arithmetic neighbours, converted to kilograms.
| Relation | pounds | kilograms |
|---|---|---|
| ÷10 | 2 lb | 0.907185 kg |
| ÷2 (half) | 10 lb | 4.53592 kg |
| ×1 (this value) | 20 lb | 9.07185 kg |
| ×2 (double) | 40 lb | 18.1437 kg |
| ×5 | 100 lb | 45.3592 kg |
| ×10 | 200 lb | 90.7185 kg |
Pounds to kilograms multiplies by 0.45359237 exactly. A 150 lb adult is 68.04 kg; a 25 lb plate is 11.34 kg. Drug dosing, anaesthesia, infant formula concentrations, and shipping freight all depend on this conversion being right to four significant figures. The half-pound matters: confusing 22 lb with 22.5 lb at a paediatric weigh-in changes a paracetamol dose by 4 %. Always convert using the full factor, then round to the precision the downstream calculation needs.
This is the reverse of the most common weight lookup on the internet, used whenever a US-sourced spec — body weight, luggage limit, or shipping weight — needs to enter a metric system: 150 lb is 68.04 kg, 200 lb is 90.72 kg, and 44 lb is 19.96 kg. Airlines publishing checked-baggage limits in both units sometimes round each side independently (50 lb becomes "23 kg" rather than the exact 22.68 kg), so always check the airline's own published figure rather than recomputing it yourself when a limit is at stake.
Start with your value in pounds.
Multiply the pound value by 0.453592. This is the exact conversion factor from pounds to kilograms.
The product is your value in kilograms. For example, 5 lb × 0.453592 = 2.26796 kg.
The exact factor from pounds to kilograms is 0.453592.
Kilograms = Pounds × 0.453592
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 0.1 lb | 0.045359 kg |
| 0.25 lb | 0.1134 kg |
| 0.5 lb | 0.2268 kg |
| 1 lb | 0.45359 kg |
| 1.5 lb | 0.68039 kg |
| 2 lb | 0.90718 kg |
| 2.5 lb | 1.134 kg |
| 3 lb | 1.3608 kg |
| 4 lb | 1.8144 kg |
| 5 lb | 2.268 kg |
| 6 lb | 2.7216 kg |
| 7 lb | 3.1751 kg |
| 8 lb | 3.6287 kg |
| 9 lb | 4.0823 kg |
| 10 lb | 4.5359 kg |
| 12 lb | 5.4431 kg |
| 15 lb | 6.8039 kg |
| 18 lb | 8.1647 kg |
| 20 lb | 9.0718 kg |
| 25 lb | 11.34 kg |
| 30 lb | 13.608 kg |
| 35 lb | 15.876 kg |
| 40 lb | 18.144 kg |
| 45 lb | 20.412 kg |
| 50 lb | 22.68 kg |
| 60 lb | 27.216 kg |
| 70 lb | 31.751 kg |
| 75 lb | 34.019 kg |
| 80 lb | 36.287 kg |
| 90 lb | 40.823 kg |
| 100 lb | 45.359 kg |
| 120 lb | 54.431 kg |
| 125 lb | 56.699 kg |
| 150 lb | 68.039 kg |
| 175 lb | 79.379 kg |
| 180 lb | 81.647 kg |
| 200 lb | 90.718 kg |
| 225 lb | 102.06 kg |
| 250 lb | 113.4 kg |
| 275 lb | 124.74 kg |
| 300 lb | 136.08 kg |
| 350 lb | 158.76 kg |
| 400 lb | 181.44 kg |
| 450 lb | 204.12 kg |
| 500 lb | 226.8 kg |
| 600 lb | 272.16 kg |
| 750 lb | 340.19 kg |
| 1000 lb | 453.59 kg |
| 2000 lb | 907.18 kg |
| 5000 lb | 2268 kg |
A loaf of bread is about 1 lb. A standard bag of sugar is 5 lb. In kilograms, that gives you: 1 lb = 0.453592 kg, 10 lb = 4.53592 kg, 100 lb = 45.3592 kg.
The international avoirdupois pound (lb) is a unit of mass in the imperial and US customary systems, defined as exactly 0.45359237 kilograms since the 1959 international yard and pound agreement. It is the everyday unit for body weight, groceries, and shipping in the United States. Sixteen ounces make one pound; fourteen pounds make one stone in British usage.
The kilogram (kg) is the SI base unit of mass. Since the 2019 redefinition it is defined by fixing the Planck constant to exactly 6.62607015 × 10⁻³⁴ J·s, replacing the old International Prototype Kilogram artifact. In everyday use, the kilogram is the global standard for body weight, groceries, and engineering specifications.
./pro
Free trial, no signup — runs entirely in your browser, nothing uploaded.
We use Plausible for cookieless analytics. Accepting also lets Google Analytics set first-party cookies to count visits; advertising partners may set cookies once ads are enabled. You can read more in the privacy policy.