Weight & Mass

Pounds to Kilograms Converter

By Inch To Cm Converter Editorial Team··1 min read

One pound is 0.45359237 kilograms – just under half. That gives a decent mental shortcut: halve the pounds, then add about 10% back (200 lb → 100 → ~90 kg). Going the other way, double the kilograms and knock off a tenth. The converter is exact; the shortcut is for the gym or the check-in queue.

Where this conversion actually comes up

Three places, mostly: body weight (a 180 lb person is 81.6 kg), airline baggage limits (a 50 lb bag is 22.7 kg; a 23 kg limit is 50.7 lb), and gym plates (a 45 lb Olympic plate is 20.4 kg, close to the metric 20 kg plate but not identical). For scale, the average US adult man weighs about 90 kg (198 lb) and a king mattress is 40-90 kg depending on type.

Pounds to kilograms table

PoundsKilogramsContext
10 lb4.54 kga small bag of flour x2
23 lb10.43 kgnear a 10 kg baggage limit
50 lb22.68 kga checked-bag limit
150 lb68.04 kga lighter adult
200 lb90.72 kga heavier adult

Pounds, stone and the wider weight picture

In the UK, body weight is often given in stone – 1 stone = 14 lb = 6.35 kg – so “12 stone” is 168 lb or 76.2 kg. For ingredients and small items, the ounces to grams converter is the right tool, and the all-in-one weight converter covers milligrams up to tonnes. If you came here to work out a calorie target, the BMR calculator uses weight in kg directly.

FAQ

How do I convert pounds to kg?

Multiply pounds by 0.45359237. A close shortcut: halve the pounds and subtract about 10%. So 160 lb ≈ 80 − 8 = 72 kg (exact: 72.6 kg).

How many kg is 150 pounds?

68.04 kg.

What is a 50 lb baggage limit in kg?

22.68 kg. Airlines with a metric limit usually set it at 23 kg, which is 50.7 lb.

Is the pound-to-kilogram factor exact?

Yes. Since 1959 the international avoirdupois pound has been defined as exactly 0.45359237 kg.

How do I convert stone to kg?

One stone is 14 pounds, or 6.35 kg. Multiply the number of stone by 6.35. "11 stone" is about 69.9 kg.

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