lbs to kg converter
One pound is exactly 0.45359237 kilograms. To convert lbs to kg, multiply the pounds by 0.45359237.
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150 pounds =
68.0389kg
Formula: kg = lb × 0.45359237
Show the steps
- Definition: 1 lb = 0.45359237 kg exactly; SI base unit of mass
- 150 lb × 0.45359237 = 68.0389 kg
Definitions used: 1 lb = 0.45359237 kg exactly; SI base unit of mass.
Source: NIST Handbook 44 (2026), Appendix C and NIST SP 811, Appendix B.8, checked on .
How to convert pounds to kilograms
Multiply the value in pounds by 0.45359237. The factor follows from the definitions: 1 lb = 0.45359237 kg exactly, and SI base unit of mass.
kg = lb × 0.45359237
Worked example: 150 lb to kg
- Definition: 1 lb = 0.45359237 kg exactly; SI base unit of mass
- 150 lb × 0.45359237 = 68.0389 kg
- Answer: 150 lb = 68.0389 kg.
Pounds to kilograms chart
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 1 | 0.453592 |
| 2 | 0.907185 |
| 5 | 2.26796 |
| 10 | 4.53592 |
| 20 | 9.07185 |
| 25 | 11.3398 |
| 35 | 15.8757 |
| 45 | 20.4117 |
| 50 | 22.6796 |
| 100 | 45.3592 |
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 120 | 54.4311 |
| 135 | 61.235 |
| 150 | 68.0389 |
| 160 | 72.5748 |
| 180 | 81.6466 |
| 200 | 90.7185 |
| 225 | 102.058 |
| 250 | 113.398 |
| 300 | 136.078 |
Values rounded to 6 significant digits. Type any other number in the converter at the top of the page.
How do you convert pounds to kg in your head?
Halve the pounds, then take away 10% of that. 150 lb → 75 → 75 − 7.5 = 67.5 kg; the exact value is 68.039 kg. The shortcut is 0.8% low.
How many kg are 45 lb and 135 lb at the gym?
A 45 lb plate or bar is 20.41 kg, close to a 20 kg plate. 135 lb (a bar with one plate per side) is 61.23 kg and 225 lb is 102.1 kg.
More questions about pounds and kilograms
How many kg is 1 lb?
Exactly 0.45359237 kg, or 453.59237 grams.
How many kg is 200 lbs?
200 lb is 90.7185 kg.
How do I convert pounds and ounces to kg?
Divide the ounces by 16, add them to the pounds, then multiply by 0.45359237. For 6 lb 4 oz: 6.25 lb × 0.45359237 = 2.835 kg.
Is “lb” or “lbs” correct?
The symbol is lb for one or many pounds; lbs is a common informal plural. Both are understood by the converter.
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Sources and limits
- NIST Handbook 44 (2026), Appendix C
NIST Handbook 44-2026, Appendix C: General Tables of Units of Measurement.
National Institute of Standards and Technology. Edition or effective date: . Text in force when checked on .
- NIST SP 811, Appendix B.8
NIST Special Publication 811, Guide for the Use of the SI, Appendix B.8: Factors for Units Listed Alphabetically (page updated August 18, 2025).
National Institute of Standards and Technology. Edition or effective date: . Text in force when checked on .
This is a calculation aid, not an official measurement service. Results are rounded to 6 significant digits for display. For trade, engineering, medical dosing or legal documents, confirm the figure in the official source. Nothing you type leaves your browser.