Skip to content

Weight converter (mass)

Kilograms, pounds, ounces, stone, grams, tonnes, short and long tons, troy ounces and carats, converted both ways.

Loading tool…

Fromkilogram (kg)
1
Topound (lb)
2.204622622
DecimalsAuto (up to 10 significant digits)

Formula: lb = kg × 2.20462262185

1 kg = 2.204622622 lb

Common values: kilogram to pound

kglb
1 kg2.204622622 lb
2 kg4.409245244 lb
5 kg11.02311311 lb
10 kg22.04622622 lb
20 kg44.09245244 lb
25 kg55.11556555 lb
50 kg110.2311311 lb
75 kg165.3466966 lb
100 kg220.4622622 lb
250 kg551.1556555 lb
500 kg1,102.311311 lb
1,000 kg2,204.622622 lb

Quick answers

1 lb to oz
16 oz
5 lb to oz
80 oz
1 oz to lb
0.0625 lb
1 lb to kg
0.4536 kg
1 kg to lb
2.2046 lb
1 st to kg
6.35 kg

How it works

Weight shows up in different units depending on who is asking: airlines quote checked-bag limits as 23 kg (50.7 lb), UK scales and doctors still use stone (14 lb), recipes from the US use ounces, gold is priced per troy ounce and gemstones per carat. This converter handles all of them from one input and shows the factor for the pair you pick.

The pound has been defined as exactly 0.45359237 kg since the 1959 international yard and pound agreement, so kilogram-pound conversions are exact: 1 kg = 2.20462262 lb. An avoirdupois ounce is 1/16 lb (28.349523125 g). The troy ounce used for precious metals is heavier, exactly 31.1034768 g, and the metric carat is exactly 200 mg. A US short ton is 2000 lb (907.18474 kg) and a UK long ton 2240 lb (1016.05 kg); the metric tonne is 1000 kg.

Scientifically these are units of mass; "weight" in everyday use means the same thing, and the numbers are identical on any scale calibrated on Earth.

Common weight conversions

Weight here means mass: the kilogram, pound and ounce. Precious metals use the troy ounce (31.1 g), gemstones the metric carat (0.2 g), and the US short ton and UK long ton differ by 240 lb.

  • 1 kg = 2.204622622 lb (lb = kg × 2.20462262185)
  • 1 lb = 0.45359237 kg (kg = lb × 0.45359237)
  • 1 oz = 28.34952313 g (g = oz × 28.349523125)
  • 1 st = 6.35029318 kg (kg = st × 6.35029318)
  • 1 t = 1.102311311 short ton (short ton = t × 1.10231131092)
  • 1 oz t = 31.1034768 g (g = oz t × 31.1034768)

Every weight unit in this converter

The size of each unit in kilograms (kg), the base unit the converter uses internally. Values are exact where the unit has an exact definition.

UnitIn kgSystem
milligram (mg)0.000001 kgMetric
gram (g)0.001 kgMetric
kilogram (kg)1 kgMetric
tonne (metric ton) (t)1,000 kgMetric
ounce (avoirdupois) (oz)0.02834952313 kgImperial / US
pound (lb)0.45359237 kgImperial / US
stone (14 lb) (st)6.35029318 kgImperial / US
US short ton (2000 lb) (short ton)907.18474 kgImperial / US
UK long ton (2240 lb) (long ton)1,016.046909 kgImperial / US
troy ounce (oz t)0.0311034768 kgPrecious metals
metric carat (ct)0.0002 kgPrecious metals

How to use it

  1. Choose the unit you have (for example kilogram) and the unit you need (for example pound).
  2. Type the value in either box; the other updates as you type.
  3. Set the number of decimals, or read other values from the table below the converter.

Frequently asked questions

How many pounds are in a kilogram?

1 kg = 2.20462262 lb, because 1 lb is defined as exactly 0.45359237 kg. For a quick estimate, double the kilograms and add 10%: 70 kg → 154 lb (exact 154.32).

How do I convert stone to kilograms?

One stone is 14 lb, which is exactly 6.35029318 kg. A person weighing 11 st 4 lb weighs 158 lb, or 71.67 kg. Enter the stone value with decimals (11.2857 st) or convert the pounds directly.

Is a troy ounce the same as a regular ounce?

No. Precious metals use the troy ounce, 31.1034768 g, which is about 9.7% heavier than the avoirdupois ounce (28.3495 g) used for food and parcels. Gold and silver prices are always per troy ounce.

What is the difference between a ton and a tonne?

A tonne (metric ton) is 1000 kg. A US short ton is 2000 lb (907.18 kg) and a UK long ton 2240 lb (1016.05 kg). Shipping and engineering documents outside the US usually mean the metric tonne.

How many ounces are in a pound (lbs to oz)?

16. The avoirdupois pound is exactly 16 ounces, so ounces = pounds × 16: 1 lb = 16 oz, 2.5 lb = 40 oz, 7 lb 8 oz = 120 oz.

Related tools