⚖️ Weight

Weight Converter

Switch between kilograms, pounds, ounces, stones and more. Perfect for travel luggage limits, cooking, fitness tracking and shipping. Press Convert when you are ready.

Written and reviewed by SM Arijul Islam · Last reviewed 28 October 2026 · Editorial standards · Report an error

About the weight converter

Strictly speaking these are units of mass, but in everyday language we call them weight. The kilogram is the SI base unit; the pound and ounce used here are the international avoirdupois versions, which are the ones found on modern scales and product labels.

Exact factors used

1 pound = 0.45359237 kilograms exactly
1 ounce = 28.349523125 grams (1/16 lb)
1 stone = 14 pounds = 6.35029318 kilograms
1 US ton (short) = 907.18474 kg · 1 UK ton (long) = 1,016.0469088 kg
1 metric carat = 0.2 grams exactly

Need body metrics instead? Try the BMI Calculator or the Ideal Weight Calculator.

How to convert weight

Weight and mass are different quantities, though everyday 'weight' usually means mass, measured in kilograms and grams or in pounds and ounces. One pound is defined as exactly 0.45359237 kg, and one avoirdupois ounce is one sixteenth of a pound. The stone — 14 pounds — remains common in the UK and Ireland for body weight, while tonnes and tons differ between the metric, US and UK systems.

Common weight conversions

One kilogram expressed in other units of weight
Unit	1 kilogram equals
Milligram (mg)	1,000,000
Gram (g)	1,000
Ounce (oz)	35.273962
Pound (lb)	2.2046226
Stone (st)	0.15747304
US ton (short) (ton)	0.0011023113
Metric tonne (t)	0.001

Common stone, pound and ounce values

Common body-weight and small-mass conversions
Input	Metric	Also
10 stone 7 lb	66.68 kg	147 lb
7 lb 8 oz	3.402 kg	3,402 g
500 g	1.102 lb	1 lb 1.6 oz

Common weight searches

Everyday weight queries people often type into this converter
Search-style query	What this page can answer	Note
1 kg in pounds	about 2.2046226 lb	the basic kg to lb figure
2 kg in pounds	about 4.4092452 lb	two kilograms in pounds
70 kg in lbs	about 154.324 lb	often wanted as 11 stone 0.3 lb too
70 kg in pounds	about 154.3 lb	same result, different wording
180 lbs in kg	about 81.6466 kg	common body-weight query
200 lbs in kg	about 90.7185 kg	common body-weight query

Everyday uses

Body weight, fitness and nutrition
Cooking, baking and portion control
Luggage limits and shipping costs
Science, engineering and trade
Converting imperial recipes to metric

Frequently asked questions — weight conversions people actually search

How many grams are in an ounce?

About 28.35 g — the international avoirdupois ounce, which is the one almost everyone means; the troy ounce used for precious metals is a different unit, at about 31.1 g.

How many grams in 8 ounces?

About 226.8 g — 8 oz is just under a quarter of a kilo.

How many grams in a pound?

One international pound is exactly 453.59237 g, commonly rounded to 453.6 g or 454 g for everyday use.

How many ounces are in a pound?

16 avoirdupois ounces for everyday weighing. The troy ounce used for precious metals is heavier, at about 31.1 grams, and is not the same as an ordinary ounce.

Is a pound 454 g or 453.6 g?

Exactly 453.59237 g. People round to 453.6 g or 454 g depending on how coarse a figure they need.

What is 60 kg in stones and pounds?

60 kg is about 9 stone 6.3 lb — the combined result many people want when converting metric weight into imperial weight.

What is 70 kg in stones and pounds?

70 kg is about 11 stone 0.3 lb — the combined result many people want when converting metric weight into imperial weight.

Is a tonne the same as a ton?

Not exactly. A metric tonne is 1,000 kg; a US short ton is about 907.18 kg; a UK long ton is about 1,016.05 kg.

More worked examples

A 70 kg adult weighs 154.32 lb (70 × 2.2046226).
A 5 lb bag of flour is 2.268 kg (5 × 0.45359237).
12 stone is 76.2 kg, because one stone is 6.35029 kg — the stone is 14 pounds.
A 500 g portion is 17.64 oz.

Quick reference

Common exact weight and mass conversion factors
Conversion	Exact value
1 kilogram	2.2046226 lb
1 pound	0.45359237 kg
1 ounce	28.349523 g
1 stone	6.3502932 kg
1 metric tonne	1,000 kg
1 US short ton	907.18474 kg
1 UK long ton	1,016.0469 kg

Common exact values

Everyday weight conversions between kilograms, pounds and stones
Kilograms	Pounds	Also
60 kg	132.3 lb	132 lb 4.8 oz
60 kg in stones and pounds	9 st 6.3 lb	60 kg = 9 st 6.3 lb
65 kg	143.3 lb	143 lb 5 oz
70 kg	154.3 lb	154 lb 5.5 oz
70 kg in lbs	154.3 lb	70 kg = 154.3 lb
70 kg in stones and pounds	11 st 0.3 lb	70 kg = 11 st 0.3 lb
75 kg	165.3 lb	165 lb 5.2 oz
80 kg	176.4 lb	176 lb 6.4 oz
80 kg in stones and pounds	12 st 8.4 lb	80 kg = 12 st 8.4 lb
85 kg	187.4 lb	187 lb 5.6 oz
100 kg	220.5 lb	220 lb 7.5 oz
130 kg	286.6 lb	286 lb 9.9 oz
160 kg	352.7 lb	352 lb 11.6 oz

Common pound values converted to kilograms
Pounds	Kilograms	Also
100 lbs in kg	45.4 kg	100 lb = 45.4 kg
130 lbs in kg	59.0 kg	130 lb = 59.0 kg
140 lbs in kg	63.5 kg	140 lb = 63.5 kg
150 lbs in kg	68.0 kg	150 lb = 68.0 kg
160 lbs in kg	72.6 kg	160 lb = 72.6 kg
180 lbs in kg	81.6 kg	180 lb = 81.6 kg
200 lbs in kg	90.7 kg	200 lb = 90.7 kg
220 lbs in kg	99.8 kg	220 lb = 99.8 kg

Common mistakes to avoid

Assuming a 'ton' always means 1,000 kg. A US short ton is about 907 kg and a UK long ton about 1,016 kg.
Confusing fluid ounces (a volume) with ounces (a mass) — recipes in the United States use both.
Using troy ounces for everyday goods. The troy ounce is about 31.1 g and is reserved for precious metals.
Treating a daily body-weight reading as a trend; hydration, food and time of day move it by a kilogram or more.

Further questions

Why is a pound exactly 0.45359237 kg?

It was fixed by the 1959 international agreement on the yard and pound, which defined the pound in terms of the kilogram.

How many grams is a cup of flour?

That is not a mass conversion — it depends on how the flour is packed, but roughly 120 to 125 g.

Is the kilogram still based on a metal cylinder?

No. Since 2019 it has been defined through the Planck constant, so it no longer depends on a physical artefact.

What is the difference between mass and weight?

Mass is the amount of matter in an object; weight is the gravitational force acting on that mass, measured in newtons.

Sources and standards

The kilogram is defined by fixing the numerical value of the Planck constant, and the international avoirdupois pound is exactly 0.45359237 kg. NIST SP 811 lists both, and the page keeps mass separate from the pound-force, which is a force.

kg to lbs and lbs to kg

One kilogram is 2.20462262 pounds, and one pound is 0.45359237 kilograms. Both figures are exact, because the international pound has been defined as 0.45359237 kg since 1959. That means 70 kg is 154.32 lb and 150 lb is 68.04 kg.

Kilograms converted to pounds and pounds converted to kilograms
Kilograms	Pounds	Pounds	Kilograms
1 kg	2.2046 lb	1 lb	0.4536 kg
10 kg	22.0462 lb	50 lb	22.680 kg
50 kg	110.231 lb	100 lb	45.359 kg
70 kg	154.324 lb	150 lb	68.039 kg
100 kg	220.462 lb	200 lb	90.718 kg

Need only one direction? Use the dedicated kg to lbs converter or the lbs to kg converter; both show the exact factor and a full chart. For body weight against height, the BMI calculator takes either unit.