Lbs to Kg Converter
Type a weight in pounds and get kilograms instantly — using the exact legal definition of the pound — plus a reference table of common weights. The kg to lbs page covers the reverse direction.
Common conversions
| lbs | kg |
|---|---|
| 100 | 45.36 |
| 110 | 49.9 |
| 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 |
| 240 | 108.86 |
| 260 | 117.93 |
| 280 | 127.01 |
The lbs → kg conversion
Since 1959 the pound has been defined as exactly 0.45359237 kg, so pounds convert to kilograms by multiplying by that factor — roughly "divide by 2, then take off 10%": 150 lbs → 75 − 7.5 = 67.5 kg (true value 68.04).
Anchors: 100 lbs ≈ 45 kg, 150 lbs ≈ 68 kg, 200 lbs ≈ 91 kg. Medication dosing is usually per kilogram, which is why US clinics convert your weight first.
Worked examples
Example 1: 150 lbs in kilograms
Convert 150 lbs — the most-asked value.
- Multiply by the exact factor.150 × 0.45359237 = 68.04
- Shortcut check: halve, minus 10%.75 − 7.5 = 67.5 ≈ ✓
150 lbs ≈ 68.0 kg.
Example 2: gym plates abroad
You lift 225 lbs (two 45 lb plates per side plus the bar) — what's that in kg?
- Convert.225 × 0.45359237 = 102.1 kg
- Nearest metric loading.bar 20 + 4 × 20 = 100 kg ≈ 220 lbs
About 102 kg — load 100 kg on a metric bar for the close equivalent.
FAQ
Exactly how many kg is 1 lb?+
Exactly 0.45359237 kg — a defined value, not a measurement. That's why pound-kilogram conversions have no rounding ambiguity at the definition level.
What's the quickest mental conversion?+
Halve the pounds and subtract 10% of that: 180 lbs → 90 − 9 = 81 kg (true 81.6). Within 1% for everyday use.
How many lbs is a stone?+
14 lbs exactly, or 6.35 kg. A UK weight of "11 stone 4" is 158 lbs ≈ 71.7 kg.
Why does my scale show different kg than this converter?+
Scales round (often to 0.1 kg or 0.2 lbs) and may be calibrated loosely. The conversion itself is exact; the measurement isn't.
Related calculators
- Kg → Lbs ConverterConvert kilograms to pounds instantly (1 kg = 2.20462 lbs) with the exact math shown and a table of common weights from 40 to 120 kg.
- Unit ConverterConvert length, weight, volume and temperature between US and metric units with exact factors and steps — feet to meters, lb to kg, °F to °C.