Convert pounds to kilograms instantly using the exact international pound conversion. Use direct conversion, reverse conversion, pounds plus ounces, or multiple equal weights, then save the result as a PDF if needed.
All numeric fields start blank with a soft zero placeholder. Typing replaces the zero instead of creating a leading-zero value, and results stay hidden until you press Convert Weight.
Your converted weight will appear here after you press Convert Weight.
The PDF includes the selected mode, input values, pounds, kilograms, ounces and metric tonnes.
The international avoirdupois pound is defined as exactly 0.45359237 kilograms. Multiply pounds by this factor to convert lb to kg.
The result keeps both primary weight units visible and adds ounces and metric tonnes as supporting references.
Keep the original avoirdupois pound value visible for comparison.
See the converted metric mass using the exact pound definition.
Use ounces as a smaller imperial weight reference.
View very large converted weights in metric tonnes.
Multiply one repeated item weight before converting to kilograms.
Save the selected conversion and supporting units for later use.
A pound (lb) is a unit of mass commonly used in the United States and in some imperial measurement contexts. A kilogram (kg) is the SI base unit of mass. The international avoirdupois pound is defined as exactly 0.45359237 kilograms.
Kilograms = Pounds × 0.45359237
Multiply 10 by 0.45359237. The result is 4.5359237 kilograms.
10 lb × 0.45359237 = 4.5359237 kg
To convert kilograms back to pounds, multiply kilograms by approximately 2.20462262185.
Pounds = Kilograms × 2.20462262185
| Pounds | Kilograms | Ounces | Metric Tonnes |
|---|---|---|---|
| 1 lb | 0.454 kg | 16 oz | 0.000454 t |
| 5 lb | 2.268 kg | 80 oz | 0.002268 t |
| 10 lb | 4.536 kg | 160 oz | 0.004536 t |
| 20 lb | 9.072 kg | 320 oz | 0.009072 t |
| 25 lb | 11.340 kg | 400 oz | 0.011340 t |
| 50 lb | 22.680 kg | 800 oz | 0.022680 t |
| 75 lb | 34.019 kg | 1,200 oz | 0.034019 t |
| 100 lb | 45.359 kg | 1,600 oz | 0.045359 t |
| 250 lb | 113.398 kg | 4,000 oz | 0.113398 t |
| 500 lb | 226.796 kg | 8,000 oz | 0.226796 t |
| 1,000 lb | 453.592 kg | 16,000 oz | 0.453592 t |
If a weight is written in pounds and ounces, first convert the ounces to pounds by dividing by 16. Add that amount to the whole pounds, then multiply the total pounds by 0.45359237.
Total Pounds = Pounds + (Ounces ÷ 16)
Kilograms = Total Pounds × 0.45359237
For repeated items such as bags, blocks, tools, packaged materials or components, enter the weight of one item in pounds and the number of equal items. The calculator multiplies the pound value first, then converts the total to kilograms.
Rounded shortcuts such as dividing pounds by 2.2 can be useful for mental estimates, but they introduce small differences. For precise results, this page uses the exact pound-to-kilogram definition.
Pounds and kilograms can appear together in shipping, material specifications, tools, equipment, fitness, packaged products and imported technical documents. For construction and concrete work, weight conversion can also help when a product data sheet or supplier quote uses a different measurement system.
You can also use the Kilograms to Pounds converter, Pounds to Ounces, Pounds to Grams, and density converters such as kg/m³ to lb/yd³ when working with material specifications.
The same method works for single weights, pounds plus ounces and repeated items.
Select lb to kg, reverse, pounds + ounces or multiple weights.
Type your known mass without a leading zero.
Apply the exact 0.45359237 factor.
Compare lb, kg, oz and metric tonnes.
Use these common examples to check quick weight conversions.
| Example | Pounds | Calculation | Kilograms |
|---|---|---|---|
| Small Item | 8 lb | 8 × 0.45359237 | 3.629 kg |
| Bag / Package | 20 lb | 20 × 0.45359237 | 9.072 kg |
| Medium Load | 50 lb | 50 × 0.45359237 | 22.680 kg |
| Heavy Item | 100 lb | 100 × 0.45359237 | 45.359 kg |
| Bulk Weight | 500 lb | 500 × 0.45359237 | 226.796 kg |
Quick answers about lb, kg, ounces, formulas and common conversion values.
1 pound equals exactly 0.45359237 kilograms.
Multiply pounds by 0.45359237.
Multiply kilograms by approximately 2.20462262185.
10 lb equals 4.5359237 kg.
50 lb equals 22.6796185 kg.
100 lb equals 45.359237 kg.
1 kg is approximately 2.20462262185 lb.
Convert ounces to pounds by dividing by 16, add that to the whole pounds, then multiply the total by 0.45359237.
The zero is only a placeholder. The field itself starts blank, so your typed number does not get an unwanted leading zero.
Yes. Use Multiple Weights mode, enter one item weight in pounds and the quantity.
The converter uses fixed mathematical relationships between pounds, kilograms, ounces and metric tonnes.
1 avoirdupois pound is defined as exactly 0.45359237 kilograms.
The main metric output is calculated directly from the exact pound relationship.
1 pound contains 16 avoirdupois ounces.
1 metric tonne equals 1,000 kilograms and is shown for larger weights.