lbs to kg Converter (Pounds to Kilograms)
Convert pounds to kilograms instantly. 1 lb = 0.45359237 kg, the exact legal definition, so the conversion never drifts. Chart from 1 to 300 lb for body weight, baggage limits and barbell loads.
Real-World Benchmarks
Multi-Unit Conversion Matrix
| Group | Measurement | Symbol | Equivalent Value |
|---|---|---|---|
| Metric (SI) | Microgram | µg | 6.8039E10 |
| Metric (SI) | Milligram | mg | 6.8039E7 |
| Metric (SI) | Gram | g | 68,038.8555 |
| Metric (SI) | Kilogram | kg | 68.0389 |
| Metric (SI) | Metric Tonne | t | 0.068 |
| Imperial & US Customary | Ounce | oz | 2,400 |
| Imperial & US Customary | Pound | lb | 150 |
| Imperial & US Customary | Stone | st | 10.7143 |
| Imperial & US Customary | Short Ton (US) | US ton | 0.075 |
| Imperial & US Customary | Long Ton (UK) | UK ton | 0.067 |
| Precious Metals & Gems | Troy Ounce | oz t | 2,187.5 |
| Precious Metals & Gems | Carat | ct | 340,194.2775 |
| Precious Metals & Gems | Grain | gr | 1,050,000 |
Step-by-Step Mathematical Explanation
- 1 lb equals 0.45359237 kg, so multiply: 150 × 0.45359237 = 68.038856 kg.
- Direct factor: 1 lb = 0.45359237 kg.
Essential Conversion Factors
Pound: International avoirdupois pound (exactly 0.45359237 kg)
lb to kg formula
Direct Answer: 1 lb = 0.45359237 kg, so multiply by 0.45359237: kg = lb × 0.45359237. Going back: lb = kg × 2.2046226.
How to convert pounds to kilograms
The international avoirdupois pound is defined as exactly 0.45359237 kilograms (1959 International Yard and Pound Agreement). Multiplying by that number gives an exact result; rounding only happens when the answer is displayed.
1. lb → kg
Multiply the number of pounds by the conversion factor:
Example: 150 lb × 0.45359237 = 68.04 kg.
2. kg → lb
To go back, divide by the same factor, or multiply by its reciprocal, 2.2046226:
Example: 68.04 kg ÷ 0.45359237 = 150 lb.
Mental math: halve it and take off 10%
Halve the pounds, then subtract a tenth of that. The estimate lands within 1% of the exact answer:
150 lb: 150 ÷ 2 = 75, minus 7.5 = 67.5 kg (exact: 68.04 kg).
1 lb in other mass units
| Unit | 1 lb equals | Typical use |
|---|---|---|
| Microgram | 453,592,370 µg | Vitamins and trace nutrients |
| Milligram | 453,592.37 mg | Medication doses and supplements |
| Gram | 453.59237 g | Cooking, postage and nutrition labels |
| Kilogram | 0.45359237 kg | SI base unit of mass — body weight and groceries |
| Metric Tonne | 0.00045359237 t | Vehicles, freight and cargo (1,000 kg) |
| Ounce | 16 oz | Avoirdupois ounce — 1/16 of a pound |
| Stone | 0.071428571 st | UK & Irish body weight unit (14 lb) |
| Short Ton (US) | 0.0005 US ton | US ton — 2,000 lb |
| Long Ton (UK) | 0.00044642857 UK ton | Imperial ton — 2,240 lb |
| Troy Ounce | 14.583333 oz t | Gold, silver and platinum pricing (31.1035 g) |
| Carat | 2,267.9619 ct | Gemstones and diamonds (exactly 200 mg) |
| Grain | 7,000 gr | Ammunition, arrows and pharmacy (1/7000 lb) |
lb to kg chart
| lb | kg |
|---|---|
| 1 | 0.45 |
| 2 | 0.91 |
| 2.2 | 1 |
| 3 | 1.36 |
| 4 | 1.81 |
| 5 | 2.27 |
| 6 | 2.72 |
| 7 | 3.18 |
| 8 | 3.63 |
| 10 | 4.54 |
| 12 | 5.44 |
| 15 | 6.8 |
| 20 | 9.07 |
| 25 | 11.34 |
| 30 | 13.61 |
| 35 | 15.88 |
| 40 | 18.14 |
| 45 | 20.41 |
| 50 | 22.68 |
| 60 | 27.22 |
| 70 | 31.75 |
| 80 | 36.29 |
| 100 | 45.36 |
| 120 | 54.43 |
| 130 | 58.97 |
| 140 | 63.5 |
| 150 | 68.04 |
| 160 | 72.57 |
| 170 | 77.11 |
| 180 | 81.65 |
| 190 | 86.18 |
| 200 | 90.72 |
| 220 | 99.79 |
| 250 | 113.4 |
| 300 | 136.08 |
kg to lb chart
| kg | lb |
|---|---|
| 0.5 | 1.1 |
| 1 | 2.2 |
| 1.5 | 3.31 |
| 2 | 4.41 |
| 2.5 | 5.51 |
| 3 | 6.61 |
| 3.5 | 7.72 |
| 4 | 8.82 |
| 4.5 | 9.92 |
| 5 | 11.02 |
| 6 | 13.23 |
| 7 | 15.43 |
| 8 | 17.64 |
| 9 | 19.84 |
| 10 | 22.05 |
| 15 | 33.07 |
| 20 | 44.09 |
| 25 | 55.12 |
| 30 | 66.14 |
| 40 | 88.18 |
| 50 | 110.23 |
| 55 | 121.25 |
| 60 | 132.28 |
| 65 | 143.3 |
| 70 | 154.32 |
| 75 | 165.35 |
| 80 | 176.37 |
| 85 | 187.39 |
| 90 | 198.42 |
| 95 | 209.44 |
| 100 | 220.46 |
| 110 | 242.51 |
| 120 | 264.55 |
| 150 | 330.69 |
Frequently Asked Questions
What is 150 lb in kg?
150 lb is 68.04 kg (150 × 0.45359237).
What is 200 lb in kg?
200 lb is 90.72 kg (200 × 0.45359237).
How many kilograms are in a pound?
One pound is exactly 0.45359237 kg, or about 0.454 kg (454 grams).
Is lb the same as lbs?
Yes. lb is the official symbol for the pound (from the Latin libra); lbs is a common informal plural. Both mean the same 0.45359237 kg unit.