KG to LBS Converter

About the KG to LBS Converter

Convert kilograms to pounds and pounds to kilograms on one page — type in either box and the other updates. The pound is defined as exactly 0.45359237 kg, so pounds = kg ÷ 0.45359237 (about kg × 2.20462) and kilograms = lb × 0.45359237. The arithmetic here is exact: 150 lb is exactly 68.0388555 kg.

Under the result you also get the weight in pounds and ounces (70 kg = 154 lb 5.2 oz) and in stones and pounds (11 st 0.3 lb). Type 11 st 4 lb or 7 lb 8 oz straight into a box, or use the Stones and pounds and Pounds and ounces fields, which work with a phone’s number keypad. Printable tables list 1–200 kg, 1–200 lb and 5–30 stone, and a short list gives everyday weights — 23 kg and 32 kg bags, gym plates — in both units.

Common uses

• Body weight from a scale, a doctor’s note or a fitness app in the other unit.
• Checking a suitcase against an airline’s per-bag limit in kg when your luggage scale shows pounds.
• Gym plates, dumbbells and lifting records in kg and lb.
• Baby weights in pounds and ounces, and UK weights in stones and pounds.
• Recipes, parcels and shipping weights given in pounds.

The formula

NIST Handbook 44 (2026), Appendix C gives 1 avoirdupois pound (lb) = 0.453 592 37 kg exactly and 1 lb = 16 oz (p. C-17) — the definition agreed internationally in 1959.

• pounds = kg ÷ 0.45359237 — 70 kg ÷ 0.45359237 = 154.32 lb
• kilograms = lb × 0.45359237 — 150 lb × 0.45359237 = 68.04 kg

In your head: double the kilograms and add 10 % (70 kg → 140 + 14 = 154 lb, 0.2 % low), or halve the pounds and take away 10 % (150 lb → 75 − 7.5 = 67.5 kg, 0.8 % low).

Pounds and ounces, stones and pounds

A pound is 16 ounces and a stone is 14 pounds (UK Weights and Measures Act 1985, Schedule 1, Part VI; NIST Handbook 44, p. C-8). To split pounds, keep the whole pounds and multiply the rest by 16: 154.3236 lb = 154 lb + 0.3236 × 16 oz = 154 lb 5.2 oz. For stones, divide by 14: 154.3236 ÷ 14 = 11 st, and 154.3236 − 154 = 0.32 lb is left over.

Going the other way, turn everything into pounds first: 11 st 4 lb = 11 × 14 + 4 = 158 lb = 71.67 kg; 7 lb 8 oz = 7.5 lb = 3.40 kg.

Airline bags and gym plates

Airlines set their own baggage rules, by route and fare. As an example, Emirates’ checked-baggage page gives a limit of 23 kg per piece in Economy and Premium Economy — one or two pieces, depending on the fare — and 32 kg per piece in Business and First on routes to and from the Americas and Africa, and says each individual bag must not weigh more than 32 kg on its other routes. 23 kg is 50.71 lb and 32 kg is 70.55 lb, so a bag that a luggage scale shows as 50 lb (22.68 kg) is inside a 23 kg limit.

Plates marked in pounds are a little heavier than their metric look-alikes: a 45 lb plate is 20.41 kg, while a 20 kg plate is 44.09 lb.

Limitations

• The conversion is exact; only the display is rounded. Pounds and ounces and stones and pounds are shown to one decimal place.
• Pound means the avoirdupois pound used for body weight, food and luggage. Precious metals use troy units — see the troy mode of the Ounces to Grams converter.
• This converts mass. Force units such as kilogram-force, pound-force and newtons are not converted here.
• For weights above a billion pounds the pounds-and-ounces and stones-and-pounds lines are left out.

Privacy

Everything happens in your browser. What you enter or open here is not uploaded or stored by MySmartCoPilot.