How many kilograms are in 1 pound?

1 lb equals 0.45359237 kg. This is an exact conversion factor defined by NIST.

How do I convert pounds to kilograms?

Multiply the value in lb by the conversion factor. For example, 10 lb = 4.5359237 kg. Use our calculator above for instant results.

Is the pounds to kilograms conversion exact?

Yes, this conversion is mathematically exact based on the international definition of these units (NIST SP 811).

Can I convert pounds to kilograms offline?

Yes! OmniConvert runs entirely in your browser — no internet connection needed after the page loads. Your data never leaves your device, ensuring complete privacy.

What is the difference between pounds and kilograms?

Pounds (lb) and Kilograms (kg) are both units of mass but belong to different measurement systems. 1 lb = 0.45359237 kg. Use the converter above to switch between them instantly.

Pounds to Kilograms (lb → kg) — Free Online Converter

lb → kg Reference Table

lb	kg
0.001 lb	0.00045359237 kg
0.002 lb	0.00090718474 kg
0.003 lb	0.00136077711 kg
0.004 lb	0.00181436948 kg
0.005 lb	0.00226796185 kg
0.006 lb	0.00272155422 kg
0.007 lb	0.00317514659 kg
0.008 lb	0.00362873896 kg
0.009 lb	0.00408233133 kg
0.01 lb	0.0045359237 kg
0.02 lb	0.0090718474 kg
0.03 lb	0.0136077711 kg
0.04 lb	0.0181436948 kg
0.05 lb	0.0226796185 kg
0.06 lb	0.0272155422 kg
0.07 lb	0.0317514659 kg
0.08 lb	0.0362873896 kg
0.09 lb	0.0408233133 kg
0.1 lb	0.045359237 kg
0.2 lb	0.090718474 kg
0.3 lb	0.136077711 kg
0.4 lb	0.181436948 kg
0.5 lb	0.226796185 kg
0.6 lb	0.272155422 kg
0.7 lb	0.317514659 kg
0.8 lb	0.362873896 kg
0.9 lb	0.408233133 kg
1 lb	0.45359237 kg
1.5 lb	0.680388555 kg
2 lb	0.90718474 kg
2.5 lb	1.133980925 kg
3 lb	1.36077711 kg
3.5 lb	1.587573295 kg
4 lb	1.81436948 kg
4.5 lb	2.041165665 kg
5 lb	2.26796185 kg
5.5 lb	2.494758035 kg
6 lb	2.72155422 kg
6.5 lb	2.948350405 kg
7 lb	3.17514659 kg
7.5 lb	3.401942775 kg
8 lb	3.62873896 kg
8.5 lb	3.855535145 kg
9 lb	4.08233133 kg
9.5 lb	4.309127515 kg
10 lb	4.5359237 kg
11 lb	4.98951607 kg
12 lb	5.44310844 kg
13 lb	5.89670081 kg
14 lb	6.35029318 kg
15 lb	6.80388555 kg
16 lb	7.25747792 kg
17 lb	7.71107029 kg
18 lb	8.16466266 kg
19 lb	8.61825503 kg
20 lb	9.0718474 kg
25 lb	11.33980925 kg
30 lb	13.6077711 kg
35 lb	15.87573295 kg
40 lb	18.1436948 kg
45 lb	20.41165665 kg
50 lb	22.6796185 kg
55 lb	24.94758035 kg
60 lb	27.2155422 kg
65 lb	29.48350405 kg
70 lb	31.7514659 kg
75 lb	34.01942775 kg
80 lb	36.2873896 kg
85 lb	38.55535145 kg
90 lb	40.8233133 kg
95 lb	43.09127515 kg
100 lb	45.359237 kg
120 lb	54.4310844 kg
125 lb	56.69904625 kg
130 lb	58.9670081 kg
140 lb	63.5029318 kg
150 lb	68.0388555 kg
160 lb	72.5747792 kg
175 lb	79.37866475 kg
180 lb	81.6466266 kg
200 lb	90.718474 kg
225 lb	102.0582833 kg
250 lb	113.3980925 kg
275 lb	124.7379018 kg
300 lb	136.077711 kg
350 lb	158.7573295 kg
400 lb	181.436948 kg
450 lb	204.1165665 kg
500 lb	226.796185 kg
600 lb	272.155422 kg
700 lb	317.514659 kg
750 lb	340.1942775 kg
800 lb	362.873896 kg
900 lb	408.233133 kg
1000 lb	453.59237 kg
1200 lb	544.310844 kg
1250 lb	566.9904625 kg
1500 lb	680.388555 kg
1750 lb	793.7866475 kg
2000 lb	907.18474 kg
2500 lb	1133.980925 kg
3000 lb	1360.77711 kg
4000 lb	1814.36948 kg
4500 lb	2041.165665 kg
5000 lb	2267.96185 kg
6000 lb	2721.55422 kg
7000 lb	3175.14659 kg
7500 lb	3401.942775 kg
8000 lb	3628.73896 kg
9000 lb	4082.33133 kg
10000 lb	4535.9237 kg
15000 lb	6803.88555 kg
20000 lb	9071.8474 kg
25000 lb	11339.80925 kg
50000 lb	22679.6185 kg
75000 lb	34019.42775 kg
100000 lb	45359.237 kg

Values based on NIST SP 811 conversion factors

Real-World Examples

Average male body weight (US)

150 lb = 68.0388555 kg

Checked baggage limit (50 lb, US airlines)

50 lb = 22.6796185 kg

25 lb dumbbell (beginner weight)

25 lb = 11.33980925 kg

Standard barbell plate (45 lb)

45 lb = 20.41165665 kg

10 lb dumbbell (light training)

10 lb = 4.5359237 kg

Why Convert Pounds to Kilograms?

Converting between pounds (lb) and kilograms (kg) is one of the most common mass conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert lb to kg saves time and prevents errors.

Mass conversions from lb to kg are vital in culinary arts, logistics, and pharmaceutical industries. Professional chefs and home bakers rely on precise ingredient conversions to replicate international recipes — a slight variation in flour or leavening agents can ruin the texture of a dish. In global shipping, freight costs and vehicle load limits depend on accurate weight calculations to ensure safety and compliance with transport regulations. Furthermore, in healthcare and chemistry, dosage calculations must be exact; confusing mass units can lead to ineffective treatments or dangerous overdoses. Reliable mass conversion ensures consistency across borders and disciplines.

How to Convert Pounds to Kilograms

To convert pounds to kilograms, use the following formula:

kg = lb × 0.45359237

Example: 1 lb = 0.45359237 kg

For example, 5 lb = 2.26796185 kg, 10 lb = 4.5359237 kg, and 100 lb = 45.359237 kg. For larger values, 1000 lb = 453.59237 kg. Conversely, 1 kg = 2.204622622 lb. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Use Cases

Average male body weight (US): 150 lb = 68.0388555 kg
Checked baggage limit (50 lb, US airlines): 50 lb = 22.6796185 kg
25 lb dumbbell (beginner weight): 25 lb = 11.33980925 kg
Standard barbell plate (45 lb): 45 lb = 20.41165665 kg
10 lb dumbbell (light training): 10 lb = 4.5359237 kg

Common Mistakes to Avoid

Mass vs Weight: confusing mass (kg) with weight/force (Newtons or lbs-force).
Ton variations: mixing up Short Ton (US), Long Ton (UK), and Metric Tonne.
Ounce confusion: confusing Ounces (weight) with Fluid Ounces (volume).

Pro Tips

Kitchen scales: Use the 'Tare' button to zero out container weight.
Water weight: 1 Liter of water weighs exactly 1 kg (at 4°C). Useful benchmark.
Conversion rule: To get kg from lbs, divide by 2.2 (approx halve it).

What is a Pound?

The pound (lb) is a unit of mass in the Imperial and US customary systems. The international avoirdupois pound is legally defined as exactly 0.45359237 kilograms since 1959.

Pounds are the primary unit of weight in the United States and are widely used in the UK for body weight. Common uses include groceries, body mass, and engineering in the US.

What is a Kilogram?

The kilogram (kg) is the base unit of mass in the International System of Units (SI). Originally defined by a platinum-iridium artifact, since 2019 it is defined by the Planck constant (h) set to 6.62607015×10⁻³⁴ J⋅s.

Kilograms are the global standard for measuring mass and weight in science, commerce, and daily life (body weight, groceries). Used nearly everywhere except the US.

Pounds → Kilograms

Pounds to Kilograms Formula