A bag of flour in a European grocery says 1 kg; the American recipe it inspired calls for pounds. The conversion — 1 kg = 2.20462 lb — is the single most useful weight factor for anyone living between the two systems. International travelers read luggage scales in kilos and airline limits in pounds. Gym-goers translate plate math. Online shoppers compare product weights across regions. And every one of them is really asking the same question: what does this feel like in the units I know? Type your value in the Kilograms (kg) box and the Pounds (lb) readout applies the 2.20462 factor, with Ounces (oz) at 35.2739 each and Stone (st) for the British view. The 70 kg example gives 154.3236 lb — the classic adult reference. The 1 kg example gives 2.2046 lb and 35.2739 oz, neat anchors for mental math.

The one-line math.

Kilograms to pounds: multiply by 2.20462. Twenty kilograms is 20 times 2.20462 = 44.0925 pounds — an Olympic barbell bar. One hundred kilograms is 220.4623 pounds. Pounds to kilograms: divide by 2.20462, or multiply by 0.45359237 — a 200-pound person is 200 times 0.45359237 = 90.7185 kg. The pound is the defined unit here: since 1959, one pound is exactly 0.45359237 kilograms, and the 2.20462 factor is just its mirror. The converter on this page applies the full-precision factor the instant you type, and the Ounces and Stone boxes ride along — 10 kg shows 22.0462 lb, 352.7396 oz, and 1.5747 stone in one glance.

Mental math that works.

Multiply kilos by 2.2 — the error is under three-tenths of a percent, invisible outside a laboratory. Seventy kilos times 2.2 = 154, against the true 154.3236. An even friendlier version: double the kilos and add ten percent of the doubled figure. Seventy becomes 140, plus 14, gives 154 — same answer, no decimal multiplication. Going the other way, halve the pounds and subtract ten percent: 154 pounds halves to 77, minus 7.7, gives 69.3 kg against the true 69.8532 — within one percent. For luggage, cooking, and conversation, the shortcuts are plenty; for medicine, freight, and competition weigh-ins, use the page's full precision.

An anchor ladder for everyday kilos.

One kilogram is 2.2046 lb — a bag of sugar plus a bit. Two kilograms is 4.4092 lb — a small bag of flour. Five kilograms is 11.0231 lb — a bag of potatoes. Ten kilograms is 22.0462 lb — a carry-on packed full. Twenty kilograms is 44.0925 lb — an Olympic bar. Twenty-five kilograms is 55.1156 lb — a big bag of dog food. Fifty kilograms is 110.2311 lb — a checked-bag-and-a-half. One hundred kilograms is 220.4623 lb — a heavyweight boxer. Note the grocery anchor Americans know by heart: the 5-pound bag of flour is 2.268 kg, and the 10-pound bag of potatoes is 4.5359 kg — which is why 2.2 and 4.5 keep showing up on packaging.

Airline luggage: the 23-kilo question.

The standard international checked-bag limit is 23 kg, which is 50.7063 pounds — and the standard US domestic limit is 50 pounds, which is 22.6796 kg. The two limits are not the same number, and the gap has cost travelers real money at check-in counters: a bag weighing exactly 23 kg is 0.7 lb over a strict 50-pound limit. Carry-on limits run 7 to 10 kg, which is 15.4324 to 22.0462 pounds. The safe habit: weigh the bag at home, convert with the real factor, and leave a kilogram of margin — 22 kg reads as 48.5017 lb, comfortably under both limits.

Gym math: bars, plates, and milestones.

The Olympic barbell bar is 20 kg — 44.0925 pounds, the metric twin of the American 45-pound bar. Standard plates run 25 kg (55.1156 lb), 20 kg (44.0925 lb), 15 kg (33.0693 lb), and 10 kg (22.0462 lb). The classic American milestones translate too: a 225-pound bench press is 102.0583 kg, and the 315-pound three-plate squat is 142.8816 kg. The 45-pound plate itself is 20.4117 kg — which is why metric lifters just call it a 20. A lifter moving between a US gym and a European one needs only the anchors: 100 kg is 220.4623 lb, and 200 lb is 90.7185 kg.

Body weight, in both directions.

One hundred fifty pounds is 68.0389 kg — a common adult reference. Two hundred pounds is 90.7185 kg. The round metric figures land nearby: 70 kg is 154.3236 lb, 75 kg is 165.3467 lb, and 80 kg is 176.3698 lb. Baby weights flip the script — a 3.5 kg newborn is 7.7162 lb — and pediatric dosing is calculated in milligrams per kilogram of body weight, which is exactly where the full-precision factor stops being optional. Fitness apps outside the US log everything in kilos; if yours asks for 68 kg, that is the 150-pound person typing.

Cooking across the Atlantic.

A kilo of flour is 2.2046 lb — and American flour is sold in 5-pound bags, which are 2.268 kg, so the European kilo bag runs a touch smaller than the American standard. Butter flips the other way: the European 250 g block is 8.8185 oz, while the American stick is 113.3981 g. Sugar's kilo bag is 2.2046 lb against the American 4-pound bag at 1.8144 kg. None of this matters much in everyday cooking — baking is the exception, where a 10 percent flour error can collapse a cake — but it matters enormously when a recipe says 500 g and your scale only reads ounces: that is 17.637 oz, just over a pound.

Stone: the British view.

The Stone box on this page exists for the UK, where body weight is still quoted in stone and pounds: one stone is 14 pounds, or 6.35029 kg. Seventy kilograms is 11.0231 stone — an 11-stone person. One hundred kilograms is 15.748 stone. To read the decimal the British way, take the fractional part times 14: 0.0231 times 14 = 0.32 lb, so 70 kg is 11 stone and about a third of a pound — 11 st 0.3 lb. If a British friend says they weigh twelve stone, that is 168 pounds, or 76.2035 kg.

Why 2.20462? A tale of two definitions.

The pound side of the story was settled in 1959, when the international pound was defined as exactly 0.45359237 kilograms — a finite, exact figure. The kilogram side was wilder: for 130 years it was a platinum-iridium cylinder in a Paris vault, and it was slowly losing mass. In 2019 the kilogram was redefined by fixing the Planck constant, retiring the cylinder forever. The conversion factor 2.20462 is the mirror of the exact pound definition — and because it is a mirror, its decimal never terminates, so any figure you see is rounded. For everyday use 2.2 is plenty; for science, the constants do the work.

Shipping, freight, and postage.

The US Postal Service caps most domestic parcels at 70 pounds — 31.7515 kg. Freight forwarders quote per-kilo rates while American shippers think per-pound: a $2-per-kilo rate is about $0.91 per pound. The quick flip: dollars per kilo divided by 2.2 is roughly dollars per pound. A 500 kg pallet is 1,102.3113 lb — just over half a US ton (a ton is 2,000 lb, or 907.1847 kg). Whenever the quote and the scale speak different units, convert the quote first; the scale is never wrong about what it measured.

Mistakes to avoid.

Three traps. First, reading a kilo scale as pounds or vice versa — a 70 on a gym scale is 70 kg (154 lb) in Berlin and 70 lb (31.8 kg) in Boston, and the difference matters enormously. Second, rounding 2.20462 to 2.2 on freight: fine on a suitcase, but across a 500 kg pallet it misses by more than 2 pounds. Third, confusing the avoirdupois pound with the troy pound — jewelers weigh gold in troy ounces (31.1035 g), so a troy pound is only 373.24 g, about 0.823 of the pound on this page. For food, luggage, and people, the avoirdupois pound here is the right one.

For students: why the factor never ends.

Here is a curiosity worth knowing: the pound is defined as exactly 0.45359237 kilograms — a finite decimal — but the kilogram-to-pound factor 2.20462262 and on never terminates. The asymmetry comes from the direction of the definition: dividing 1 by 0.45359237 produces a repeating decimal, the same way 1 divided by 3 gives 0.333 and on. It is exact anyway — exact by definition, rounded only when written down. That is why the converter keeps extra digits internally and why textbooks print 2.20462: enough precision for every scale you will ever stand on.

A pocket reference to keep.

If you remember only four numbers, make them these: 1 kg is 2.2046 lb, 10 kg is 22.0462 lb, 23 kg is 50.7063 lb — the airline limit — and 100 kg is 220.4623 lb. Between those four anchors, every everyday conversion is a short mental hop. And when precision matters — the prescription, the freight quote, the weigh-in — the converter at the top of this page is one tap away.

With the pre-filled defaults — Kilograms (kg) 70 — the Kilogram to Pound returns Pounds (lb) 154.3234, Ounces (oz) 2,469.18, Stone (st) 11.0231. Change any input and those results update instantly, so you can see exactly how each number you enter moves the answer.