Lbs to Kg Converter
Convert lbs to kg instantly with this free pounds to kilograms tool. Type any pound value and get the exact kilogram equivalent, with a quick reference table for common US body weights, sports categories, and baby weights. Need the reverse direction? The same converter handles kg to lbs with a single tap on the swap button.
1 Pound = 0.453592 Kilogram
Pound to kilogram reference table
Common US weight benchmarks converted to metric, with their context.
| Pounds (lbs) | Kilograms (kg) | Context |
|---|---|---|
| 100 lbs | 45.36 kg | Petite adult, large child |
| 120 lbs | 54.43 kg | Average young adult woman (US) |
| 130 lbs | 58.97 kg | Common female weight class |
| 140 lbs | 63.50 kg | Welterweight boxing limit (147) |
| 150 lbs | 68.04 kg | Average woman (US) |
| 165 lbs | 74.84 kg | Middleweight boxing (160 lb) |
| 180 lbs | 81.65 kg | Average man (US) |
| 200 lbs | 90.72 kg | Strength training milestone |
| 220 lbs | 99.79 kg | Light heavyweight boxing (175) |
| 250 lbs | 113.40 kg | Heavyweight class threshold |
| 300 lbs | 136.08 kg | Super heavyweight, NFL lineman |
Baby weight conversion (lbs and oz to kg)
US hospitals record newborn weight in pounds and ounces. Here is what each common weight looks like in kilograms.
| Pounds and ounces | Total pounds | Kilograms |
|---|---|---|
| 5 lb 0 oz | 5.00 lbs | 2.27 kg |
| 6 lb 0 oz | 6.00 lbs | 2.72 kg |
| 7 lb 0 oz | 7.00 lbs | 3.18 kg |
| 7 lb 8 oz | 7.50 lbs | 3.40 kg |
| 8 lb 0 oz | 8.00 lbs | 3.63 kg |
| 8 lb 8 oz | 8.50 lbs | 3.86 kg |
| 9 lb 0 oz | 9.00 lbs | 4.08 kg |
| 10 lb 0 oz | 10.00 lbs | 4.54 kg |
Why use this converter
Instant conversion
Type any lbs and see kg update without pressing a button.
US weight table
Common American body weights (100, 150, 200, 250 lbs) in kg.
Recipe-friendly
Convert ingredient weights from US cookbooks to metric units.
Baby weight conversion
US hospitals record birth weight in lbs and oz. See it in kg.
Swap any time
Switch direction back to kg to lbs with one click.
No signup
Open and convert. Nothing stored, nothing tracked.
When you need lbs to kg conversion
Reading US recipes
American cookbooks list meat and bulk ingredients in pounds. Convert quickly when cooking with metric measuring tools.
US baby weight
Birth weights in US hospitals are recorded in pounds and ounces. A 7 lb 8 oz baby is 3.4 kg.
Boxing and MMA weight classes
Fighter weights are announced in pounds. Heavyweight = 200+ lbs (90.7+ kg). Welterweight = 147 lbs (66.7 kg).
NFL and basketball player weights
Roster sheets list weights in pounds. Convert for international scouting or comparison.
US shipping and freight
Carriers in the US show package weights in pounds. Convert to kg for international shipping forms.
Personal weight tracking abroad
If you grew up tracking your weight in pounds but live in a metric country, convert your old records.
About pounds and kilograms
How to convert lbs to kg
To convert lbs to kg, multiply the pound value by 0.45359237. That single step is all it takes to turn any weight in pounds into kilograms. If you prefer division, you can divide the pound value by 2.20462 and get the same answer. For example, to convert 165 lbs to kg you would calculate 165 x 0.45359237, which gives 74.84 kg. The converter at the top of this page does the same math for you the moment you type, so you never have to reach for a calculator. Because lbs and kg are both units of mass, the conversion factor stays identical no matter how large or small the number is.
The pounds to kilograms formula
One pound is defined as exactly 0.45359237 kilograms. The simple formula is kg = lbs x 0.45359237. To go from kg back to lbs, divide by the same number, or multiply kilograms by 2.20462. The international definition has been fixed since the 1959 agreement between the US, UK, and other English-speaking countries that adopted a common pound. Because that constant is exact, any pounds to kilograms result you see here matches scientific and legal standards used worldwide.
How to mentally convert lbs to kg fast
Half the pounds, then knock off about 10 percent. So for 200 lbs: half is 100, knock off 10 percent and you land on 90 kg (the exact value is 90.72). For 150 lbs: half is 75, knock off 10 percent and you get 67.5 kg (exact: 68.04). This trick stays within about 1 percent of the true value, which is fast enough for shopping, gym talk, and everyday conversations. When you need a precise figure for a medical form or a shipping label, use the calculator above instead of the estimate.
Common pounds to kilograms conversions
Some weights come up far more often than others, especially everyday bodyweight numbers. Here are the ones people search for most. The query "150 lbs in kg" resolves to 68.04 kg, a typical adult weight in the US. The query "180 lbs in kg" gives 81.65 kg, close to the average weight of an adult man in the US. The popular "200 lbs in kg" search returns 90.72 kg, often cited as a strength training milestone. Rounder figures are easy too: 100 lbs is 45.36 kg, 120 lbs is 54.43 kg, 130 lbs is 58.97 kg, 160 lbs is 72.57 kg, 220 lbs is 99.79 kg, and 250 lbs is 113.40 kg. The reference table earlier on this page lays these out alongside the context where each weight appears.
Why does the US use pounds?
The US inherited the pound from British imperial measurement. Britain adopted the metric system for most purposes during the 20th century, but the US never fully made the switch. The Metric Conversion Act of 1975 declared metric to be the "preferred" system, but did not require it. Daily-life weights in the US still use pounds: body weight, baby weight, grocery items, and mailing packages. This is why so many people need to convert lbs to kg, since the rest of the world reports weight in kilograms on labels, prescriptions, and travel documents.
Reading US baby weights
US hospitals announce newborn weight in pounds and ounces. A common figure is "7 pounds 8 ounces" which means 7.5 lbs, since 8 oz is half a pound. That equals 3.40 kg. Average newborn weight in the US is about 7.5 lbs (3.4 kg) for full-term babies. Anything below 5 lb 8 oz (2.5 kg) is classified as low birth weight by international standards. Parents who want to compare notes with family or doctors abroad usually need to convert these pounds figures to kilograms, because pediatric growth charts outside the US are built in kg.
Lbs and kg in fitness and medical use
In the gym, plates, dumbbells, and personal records in the US are tracked in pounds, while most international lifting standards and Olympic weightlifting use kilograms. Knowing both lets you compare a 225 lb bench press (102.06 kg) with a lifter who trains in metric. On the medical side, the contrast matters even more. Doctors and pharmacists outside the US calculate drug doses by bodyweight in kilograms, so a patient who knows their weight only in pounds should convert it before an appointment. Body mass index also depends on weight in kilograms, which is why our BMI calculator and this lbs to kg tool pair well together.
Sports weight classes in pounds vs kg
Boxing, MMA, and wrestling use weight classes that originated in pounds. Welterweight is 147 lbs (66.7 kg). Middleweight is 160 lbs (72.6 kg). Heavyweight in boxing starts at over 200 lbs (90.7 kg). International Olympic categories use kilograms (66 kg, 73 kg, 81 kg, and so on), which is why athletes need to convert between the two systems when competing globally. Fans following a card announced in pounds can use this converter to see where each fighter would fall on a metric scorecard.
Converting kg to lbs (the reverse direction)
The opposite conversion, kg to lbs, is just as common and is actually searched even more often than pounds to kilograms. To convert kilograms to pounds, multiply the kg value by 2.20462. For example, 70 kg is 154.32 lbs and 80 kg is 176.37 lbs. This converter handles both directions: enter a value in pounds to see kilograms, then press the swap button to flip it and read kg to lbs instead. Whether you start from lbs and kg or work the other way, the math stays consistent because both results rely on the same fixed factor.
1 pound equals 0.453592 kilograms. For quick mental math, multiply pounds by 0.45 and you get a value within 1% of exact.
Multiply the pound value by 0.453592 (or divide by 2.20462). For example, 150 lbs x 0.453592 = 68.04 kg. Our converter does this instantly as you type.
150 pounds equals 68.04 kilograms. This is a typical body weight benchmark for adult women in the US and falls within the healthy BMI range for most heights.
180 pounds equals 81.65 kilograms. This is a common body weight benchmark for adult men in the US.
200 pounds equals 90.72 kilograms. This is often used as a strength training milestone (bench press or deadlift 200 lbs).
250 pounds equals 113.4 kilograms. This is the weight class threshold for heavyweight boxing and many strength sports.
100 pounds equals 45.36 kilograms. This is the threshold for many luggage and freight categories.
Divide the pound value by 2, then subtract 10% of the result. Example: 150 lbs. Half = 75. Subtract 7.5 (10% of 75) = 67.5 kg (exact: 68.04). Or simpler: multiply by 0.45 in your head.
The US uses the imperial system, which it inherited from British colonial measurements. Although the metric system was officially adopted as a preferred system in 1975, daily life weights (baby weights, body weight, groceries, shipping) are still measured in pounds in the US.
They are the same. "Lbs" is the abbreviation for pounds, from the Latin "libra" which means scales or balance. So "150 lbs" and "150 pounds" mean exactly the same weight.
Multiply the number of pounds by 0.45359237 to get kilograms. For instance, 180 pounds x 0.45359237 = 81.65 kg. You can also divide the pound value by 2.20462 for the same result, and our converter applies this automatically as you type.
120 pounds equals 54.43 kilograms. This is a common bodyweight figure for adults and is a frequent search when filling out medical or travel forms that ask for weight in kilograms.
130 pounds equals 58.97 kilograms. This weight sits within a typical female combat sports range and is close to several international weight classes.
160 pounds equals 72.57 kilograms. In boxing, 160 lbs is the middleweight limit, which maps neatly to common metric weight classes used internationally.
To convert kg to lbs, multiply the kilogram value by 2.20462. For example, 70 kg equals 154.32 lbs. Our tool works in both directions, so you can press the swap button to switch from lbs to kg conversion over to kg to lbs.
Yes. Since the 1959 international agreement, one pound has been defined as exactly 0.45359237 kilograms in the US, UK, and other English-speaking countries. That means lbs and kg values convert identically no matter where you are.
A quick method is to multiply the pound value by 0.45, which lands within 1% of the exact answer. So 200 lbs is roughly 90 kg and 150 lbs is roughly 67.5 kg. For an exact figure, use the converter at the top of this page.