Last updated: May 2026
Enter kilograms — get pounds, stones, and ounces instantly. Works for body weight, luggage limits, and gym plates.
Two-way conversion — change either field and the other updates live
kg → lbs: Multiply kilograms by 2.20462. Example: 80 kg × 2.20462 = 176.37 lb.
lbs → kg: Divide pounds by 2.20462 (same as multiplying by 0.45359). Example: 176.37 lb ÷ 2.20462 = 80 kg.
Stones: Take the total pounds, divide by 14 (drop the remainder for the stone count), then the remainder is the leftover lbs. Example: 176.37 lb → 176 ÷ 14 = 12 stone, remainder 8 → 12 st 8 lb.
Ounces: Multiply lbs by 16. Example: 176.37 lb × 16 = 2,821.9 oz.
Grams: Multiply kg by 1,000. Example: 80 kg = 80,000 g.
Related Converters
The kilogram and the pound measure the same thing — mass — but they come from completely different systems of measurement. The relationship between them is fixed: 1 kilogram = 2.20462 pounds. That's it. Memorize that one number and you can convert anything in your head (approximately, anyway).
For a quick mental estimate, multiply kg by 2.2. You'll be off by about 0.2% — close enough for body weight, good enough for luggage, not good enough for industrial quantities. For exact calculations, use 2.20462 or just let this converter do the math.
Going the other direction — lbs to kg — divide by 2.20462, or equivalently multiply by 0.45359. So 200 lbs ÷ 2.20462 = 90.72 kg. A 200-pound person weighs just over 90 kg.
This table covers the full range of human body weights plus common gym and luggage scenarios. The "stones + lbs" column is formatted the way it's read in the UK — so 12 st 8 lb means 12 full stones plus 8 extra pounds.
| Kilograms (kg) | Pounds (lbs) | Stones + lbs (UK) |
|---|---|---|
| 50 kg | 110.2 lb | 7 st 12 lb |
| 60 kg | 132.3 lb | 9 st 6 lb |
| 70 kg | 154.3 lb | 11 st 0 lb |
| 80 kg | 176.4 lb | 12 st 8 lb |
| 90 kg | 198.4 lb | 14 st 2 lb |
| 100 kg | 220.5 lb | 15 st 10 lb |
| 110 kg | 242.5 lb | 17 st 4 lb |
| 120 kg | 264.6 lb | 18 st 12 lb |
| 130 kg | 286.6 lb | 20 st 6 lb |
| 140 kg | 308.6 lb | 22 st 0 lb |
| 150 kg | 330.7 lb | 23 st 8 lb |
The metric system was invented in France in the 1790s and has been spreading ever since. By now, almost every country officially uses kilograms. Almost. The United States uses pounds and ounces for everyday weight, while the UK is technically metric but informally still uses pounds for body weight and stone for heavier measurements. This creates the constant need for conversion — and approximately 50,000 searches a day for "kg to lbs."
The US came close to switching in the 1970s. The Metric Conversion Act of 1975 was passed but made voluntary, and industries lobbied against mandatory change. Science, medicine, and pharmaceuticals in the US do use metric units. Your doctor measures your weight in kg in their system even if they tell you the number in pounds.
Most gym equipment outside the US is calibrated in kilograms. A 20 kg plate is the standard Olympic barbell plate — it weighs about 44 lbs. If you learned to lift in a US gym and move abroad, that "225 lb bench press" becomes "102 kg" on the whiteboard — less impressive-sounding but the exact same weight on the bar.
Common gym plate conversions worth memorizing: 2.5 kg = 5.5 lb, 5 kg = 11 lb, 10 kg = 22 lb, 20 kg = 44 lb, 25 kg = 55 lb. The 45 lb plate common in US gyms is actually 20.4 kg — not exactly 20 kg, which is why "lb plates" and "kg plates" aren't interchangeable without re-calibrating your program.
For bodyweight tracking, the math is the same as any other weight: multiply your scale reading in kg by 2.20462. If you're logging macros or tracking weight loss, make sure your fitness app is set to the same unit as your scale — mixing them up leads to confusing data and frustrating graphs.
Most international carriers publish checked baggage limits in kilograms. Most US domestic carriers use pounds. Here are the limits you'll actually run into:
Economy class checked bag: typically 23 kg (50 lbs) on international routes. Budget airlines in Europe and Asia often cap at 20 kg (44 lbs). Business class: 32 kg (70 lbs) is common, with some carriers allowing more. Carry-on: 7–10 kg (15–22 lbs) depending on carrier and whether it's a full-size or personal item.
The easiest way to avoid fees: weigh your bag at home, convert to match what the airline lists, and aim to be at least 1 kg / 2 lbs under the limit (scales vary). A digital luggage scale that shows both units costs about $10 and pays for itself on the first overweight bag you catch in time.
BMI (Body Mass Index) can be calculated in either unit system. The metric formula — weight in kg divided by height in meters squared — is simpler. If your scale gives you pounds, convert to kg first by dividing by 2.20462, then run the BMI formula.
Alternatively, the imperial BMI formula is: (weight in lbs × 703) ÷ (height in inches)². Both formulas give the same BMI result, because the 703 factor is just the unit conversion baked in. Use whatever units you already have — just don't mix them.
One practical note: if you're tracking weight loss in a country that uses kg but your reference charts are in lbs, a 1 kg loss equals 2.2 lbs lost. A 10 kg weight loss is 22 lbs. A 50 lb weight loss is 22.7 kg. The math is always the same multiplication or division by 2.20462.
Stone is the odd one out — a unit of weight used almost nowhere outside the UK and Ireland, and even there only for body weight. One stone is exactly 14 pounds, or about 6.35 kg. The reason it persists is purely cultural: British people grew up hearing body weight described in stone, so a number like "12 stone 8" is instantly meaningful in a way that "176.4 pounds" or "80 kilograms" isn't.
Converting kg to stone: divide by 6.35029 to get the stone value as a decimal, then multiply the decimal part by 14 to get the remaining pounds. So 80 kg ÷ 6.35029 = 12.598 stone → 12 stone, 0.598 × 14 = 8.37 lb → 12 st 8 lb.
Stone is never used for luggage, food, or anything other than body weight. You won't see it on a shipping label or a food package — just on doctor's notes and in conversations about someone's weight.
Most of the world adopted the metric system (kilograms) during the 18th–20th centuries because it's decimal-based and easier to scale. The US kept the imperial pound because the Metric Conversion Act of 1975 was voluntary — and habits never changed. The UK is in between: officially metric but still uses pounds for body weight informally and stone for heavier body weight measurements.
It depends on your gym's equipment. Most commercial gyms outside the US use kg plates. US gyms typically use lbs. If you travel between countries, divide lbs by 2.205 to convert. Many fitness apps let you toggle the unit, but the underlying math doesn't change — only the number on the display does. Pick one unit and stick to it for consistent progress tracking.
Most international carriers allow 23 kg (about 50 lbs) for checked bags in economy. Some budget airlines go lower at 20 kg (44 lbs). Business class is often 32 kg (70 lbs). Carry-on limits are typically 7–10 kg (15–22 lbs). Always check your specific airline — these limits vary and overage fees can be steep.
Multiply your weight in kg by 2.20462 to get lbs. For BMI, you can also use the metric formula directly: BMI = weight (kg) ÷ height² (m²). There's no need to convert to lbs for BMI unless you're using an imperial formula, which is: BMI = (weight in lbs × 703) ÷ height² (inches²). Both give the same result.
Stone is a unit of weight used almost exclusively in the UK and Ireland for measuring body weight. One stone equals exactly 14 pounds or approximately 6.35 kg. A person who weighs 12 stone 8 lbs weighs 176.4 lbs or exactly 80 kg. Stone is not used for anything other than body weight — not luggage, food, or shipping.