LBS TO KG Converter
The fastest free pounds-to-kilograms converter online. Instant results, full reference table, reverse kg → lbs mode, and bodyweight conversion. No signup needed.
- Instant conversion
- lbs → kg & kg → lbs
- Full reference table
- Barbell plate chart
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kg per pound (exact factor)
lbs per kilogram
Values in reference table
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HOW TO USE THE LBS TO KG CONVERTER
Four ways to get the weight conversion you need in seconds.
Enter any value in the pounds field above. Decimals are supported — e.g. 185.5 lbs converts precisely to 84.14 kg.
The kg result appears instantly as you type. Hit "Convert Now" to see the full breakdown including grams, stones, and ounces.
Toggle to "kg → lbs" mode or type directly into the right field to reverse the conversion at any time.
Scroll to the full lbs-to-kg reference table below covering 1 lb to 500 lbs in 1 lb increments. Filter by any value instantly.
Best Set for Accuracy: Divide pounds by 2 and subtract 10% of that result. For example, 200 lbs → 200 ÷ 2 = 100 → subtract 10 = ~90 kg. The exact answer is 90.72 kg. Close enough for a gym conversation.
BODYWEIGHT CONVERTER
Convert your bodyweight in pounds to kilograms — and see which powerlifting or weightlifting weight class you fall into.
IPF POWERLIFTING WEIGHT CLASSES
| CLASS (KG) | APPROX (LBS) | GENDER |
|---|---|---|
| 59 kg | 130 lbs | Men |
| 66 kg | 145.5 lbs | Men |
| 74 kg | 163 lbs | Men |
| 83 kg | 183 lbs | Men |
| 93 kg | 205 lbs | Men |
| 105 kg | 231.5 lbs | Men |
| 120 kg | 264.5 lbs | Men |
| 47 kg | 103.6 lbs | Women |
| 52 kg | 114.6 lbs | Women |
| 57 kg | 125.7 lbs | Women |
| 63 kg | 138.9 lbs | Women |
| 72 kg | 158.7 lbs | Women |
| 84 kg | 185.2 lbs | Women |
BARBELL PLATE WEIGHTS: LBS VS KG
Every standard Olympic plate weight in both units — essential for lifting at gyms that use different systems.
| Plate (lbs) | Plate (kg) | Colour (standard) | Use case | Intensity bar |
|---|---|---|---|---|
| 45 lb | 20.41 kg | Red (IWF) / Blue | Primary plate, most lifts | |
| 35 lb | 15.88 kg | Yellow / Green | Accessory loading | |
| 25 lb | 11.34 kg | Green | Secondary plate | |
| 10 lb | 4.54 kg | Black / White | Fine-tune loading | |
| 5 lb | 2.27 kg | Black | Micro-loading | |
| 2.5 lb | 1.13 kg | Silver / Chrome | Smallest fractional | |
| 1.25 lb | 0.57 kg | Fractional | Microload PRs |
| Bar type | Weight (lbs) | Weight (kg) | Common use |
|---|---|---|---|
| Standard Olympic Bar | 45 lb | 20.41 kg | Powerlifting, general strength |
| Women's Olympic Bar | 33 lb | 15 kg | Olympic weightlifting (women's) |
| Trap / Hex Bar | ~60 lb | ~27 kg | Deadlifts, carries |
| Safety Squat Bar | ~65 lb | ~29.5 kg | Squat variations |
| EZ Curl Bar | ~25 lb | ~11.3 kg | Curls, skull crushers |
IWF vs gym plates: International Weightlifting Federation (IWF) plates are denominated in kg with standard colour coding: red = 25 kg, blue = 20 kg, yellow = 15 kg, green = 10 kg, white = 5 kg, black = 2.5 kg. Most US gyms use 45 lb (20.41 kg) plates. When travelling between systems, use this table to avoid loading mismatches.
COMMON WEIGHT CONVERSIONS: LBS TO KG
The most-searched weight conversions — from bodyweight benchmarks to popular lifting milestones.
Popular barbell totals in both units
Common human bodyweights
Boxing / MMA / wrestling
Helpful reference points
LBS TO KG CONVERSION TABLE: 1–500 LBS
Once you calculate your deadlift max, use this chart to program exact working weights for every training goal. This is your one rep deadlift calculator reference for intelligent programming.
| Pounds (lbs) | Kilograms (kg) | Grams (g) | Stones & lbs |
|---|
THE LBS TO KG CONVERSION FORMULA
The exact conversion factor, how it was defined, and the fastest ways to use it in your head.
Pounds to Kilograms
The international pound was defined as exactly 0.45359237 kilograms by the International Yard and Pound Agreement of 1959. This is the exact, legally binding conversion factor used worldwide — it is not a rounded approximation.
Kilograms to Pounds
The reciprocal — 1 ÷ 0.45359237 — gives exactly 2.204622621848776… pounds per kilogram. For practical use, 2.2046 is accurate to within 0.002% for values under 1,000 lbs.
Fast Approximation
lbs ≈ kg × 2.2
For quick mental estimates, dividing pounds by 2.2 gives a result accurate to within ±0.9% for values under 500 lbs. Most lifters use this to quickly re-express their maxes between systems.
The Half-and-Subtract Method
Halve the pounds value, then subtract 10% of the result. Example: 220 lbs → 110 × 0.9 = 99 kg (exact: 99.79 kg). Error under 0.8%. The most reliably accurate mental-math shortcut.
Most strength training programs originating in the US use pounds. Most scientific literature, international competitions, and programs from the UK, Europe, and Australia use kilograms. Being fluent in both systems — and knowing the difference between a 100 kg and a 100 lb squat — is practically useful for any serious lifter.
POUNDS VS KILOGRAMS: WHICH SYSTEM DO YOU NEED?
The difference between lifting in pounds and kilograms goes beyond a unit — it affects how you read programs, track progress, and compete.
| Context | Pounds (lbs) | Kilograms (kg) |
|---|---|---|
| Primary countries | USA, some gym culture in UK/Australia | Everywhere else, international competitions |
| Scientific literature | Rarely used | Standard unit in all peer-reviewed research |
| Powerlifting meets | Used in USAPL / USA domestic meets | IPF, all international federations |
| Olympic weightlifting | Not used | Always kg — IWF standard |
| Commercial gym equipment | US-made dumbbells, machines | European, Australian, and commercial Olympic sets |
| Programming increments | 5 lb jumps (~2.27 kg) are standard | 2.5 kg jumps (~5.5 lbs) are standard |
| BMI & medical use | Not standard | Always kg — WHO standard |
WHAT ARE POUNDS AND KILOGRAMS?
The pound (lb)
The pound is a unit of mass used primarily in the United States customary system and, to a lesser degree, in the imperial system. The word “pound” derives from the Latin libra pondo, meaning “a pound by weight” — which also explains the symbol “lb.” The modern international avoirdupois pound is defined as exactly 0.45359237 kilograms since the International Yard and Pound Agreement of 1959.
The kilogram (kg)
The kilogram is the base unit of mass in the International System of Units (SI). Since May 2019, it has been defined in terms of the Planck constant (h = 6.62607015 × 10⁻³⁴ J·s), providing an invariant physical definition independent of any physical object. Before 2019, it was defined by the mass of the International Prototype Kilogram — a platinum-iridium cylinder kept in France. The kilogram is used in every country except the United States, Liberia, and Myanmar for commercial and everyday purposes.
Why two systems exist
The metric system was developed during the French Revolution in the 1790s to create a universal measurement system. Britain adopted it gradually through the 20th century; the United States began transitioning with the Metric Conversion Act of 1975 but never fully completed the switch. As a result, the US remains one of three countries that has not adopted metric as its primary system, creating the persistent need for lbs-to-kg conversion in sports, medicine, and science.
Pounds and kilograms in strength sports
In practice, the difference matters most in competitive strength sports. US-based powerlifters trained in pounds often struggle when competing in international IPF meets denominated in kilograms. A 315 lb deadlift — a common milestone — is 142.88 kg, which doesn’t align neatly with the 140/150 kg progressions used in kg-based programming. Knowing exact conversions prevents loading errors and keeps your programming percentages accurate.
FREQUENTLY ASKED QUESTIONS
The most common questions about converting pounds to kilograms and using this converter.
1 pound (lb) equals exactly 0.45359237 kilograms (kg). This is the internationally agreed exact definition as set by the International Yard and Pound Agreement of 1959. For most practical calculations, rounding to 0.4536 kg per pound introduces an error of less than 0.001%.
1 kilogram (kg) equals approximately 2.20462 pounds (lbs). The exact reciprocal of the conversion factor (1 ÷ 0.45359237) is 2.204622621848776... For quick mental math, 2.2 lbs per kg is accurate to within 0.21%.
To convert pounds to kilograms, multiply the number of pounds by 0.45359237.
Example:
100 lbs × 0.45359 = 45.36 kg
A quicker approximation is to divide pounds by 2.2:
100 ÷ 2.2 = 45.45 kg
The difference is under 0.2% for most values.
225 pounds equals 102.06 kilograms.
Calculation:
225 × 0.45359237 = 102.058 kg
100 kilograms equals approximately 220.46 pounds.
Calculation:
100 × 2.20462 = 220.462 lbs
185 pounds equals 83.91 kilograms.
Calculation:
185 × 0.45359 = 83.915 kg
315 pounds equals 142.88 kilograms.
Calculation:
315 × 0.45359 = 142.882 kg
Yes. lb and lbs both refer to pounds. "lb" is the standard abbreviation derived from the Latin libra pondo, while "lbs" is the commonly used plural form. Both are widely understood, although "lb" is preferred in scientific writing.
A simple mental shortcut is to multiply kilograms by 2.2.
Example:
80 kg × 2.2 = 176 lbs
The United States primarily uses the imperial system, so gym equipment is manufactured in pounds (lbs). Most other countries use the metric system, so their equipment is labeled in kilograms (kg). International organizations such as the IPF and IWF also use kilograms for competition.
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