CloudCalcAppWeight Converter
Convert kg, pounds, ounces, grams, stone and tons. Uses the exact 1 lb = 0.45359237 kg, with a reference table and tonne vs US and UK ton.
Last updated October 24, 2026
Swap is available once both units are chosen.
Conversion Result
Choose a From and a To unit - or tap a quick start - then enter a value.
Conversion factor
Select two units to see the conversion factor.
Popular Conversions
Examples
1 kilogram to grams
- Value:
- 1
- From Unit:
- Kilograms (kg)
- To Unit:
- Grams (g)
1 kilogram is exactly 1,000 grams.
1 kilogram to pounds
- Value:
- 1
- From Unit:
- Kilograms (kg)
- To Unit:
- Pounds (lb)
1 kilogram is about 2.2046 pounds.
16 ounces to pounds
- Value:
- 16
- From Unit:
- Ounces (oz)
- To Unit:
- Pounds (lb)
16 ounces is exactly 1 pound.
100 grams to ounces
- Value:
- 100
- From Unit:
- Grams (g)
- To Unit:
- Ounces (oz)
100 grams is about 3.5274 ounces.
11 stone to kilograms
- Value:
- 11
- From Unit:
- Stone (st)
- To Unit:
- Kilograms (kg)
11 stone is about 69.8532 kilograms (exactly 69.85322498).
1 long ton to kilograms
- Value:
- 1
- From Unit:
- Long tons (UK)
- To Unit:
- Kilograms (kg)
1 UK long ton is exactly 1,016.0469088 kilograms (shown as 1016.0469).
Weight Conversion Reference
| Relationship | Exact or rounded |
|---|---|
| 1 kg = 1,000 g | Exact |
| 1 g = 1,000 mg | Exact |
| 1 t (tonne) = 1,000 kg | Exact |
| 1 lb = 0.45359237 kg | Exact (definition) |
| 1 lb = 16 oz | Exact |
| 1 oz = 28.349523125 g | Exact |
| 1 st = 14 lb = 6.35029318 kg | Exact |
| 1 kg ≈ 2.2046 lb | Rounded |
| 1 g ≈ 0.0353 oz | Rounded |
| 1 kg ≈ 0.1575 st | Rounded |
Tonne, US Short Ton and UK Long Ton
Three different units are all called a ton. They are not interchangeable, so check which one a figure uses before converting it.
| Unit | Kilograms | Pounds |
|---|---|---|
| Tonne (metric ton) | = 1,000 kg | ≈ 2,204.6226 lb |
| US short ton | = 907.18474 kg | = 2,000 lb |
| UK long ton | = 1,016.0469088 kg | = 2,240 lb |
One UK long ton is exactly 1.12 US short tons. One tonne is about 1.1023 short tons or 0.9842 long tons.
Metric, US and Imperial Weight Units
Metric units scale by powers of ten. The ounce, pound, stone and both non-metric tons are all defined from one value, the international avoirdupois pound of exactly 0.45359237 kilograms.
- Milligram (mg) -
- one thousandth of a gram, used for very small amounts such as nutrition labels.
- Gram (g) -
- one thousandth of a kilogram, the usual unit for food and recipes in metric countries.
- Kilogram (kg) -
- the SI base unit of mass, used for body weight, luggage and most everyday weighing.
- Ounce (oz) -
- one sixteenth of a pound; this converter uses the avoirdupois ounce, not the troy ounce.
- Pound (lb) -
- exactly 0.45359237 kilograms, the base of the US and imperial weight units.
- Stone (st) -
- 14 pounds, still used for body weight in the UK and Ireland, often as stone and pounds.
Where Weight Conversions Come Up
- Cooking and baking - metric recipes use grams, US recipes ounces and pounds. See grams to ounces or ounces to grams.
- Parcels and luggage - carriers and airlines state limits in kilograms or pounds.
- Body weight - kilograms in most countries, pounds in the US, and stone and pounds in the UK and Ireland. See kilograms to pounds or pounds to kilograms.
- Freight and bulk materials - tonnes, US short tons or UK long tons, which differ by up to 12 percent.
FAQ
How does this weight and mass converter work?
It routes every conversion through kilograms as one common base unit. Your value is multiplied by the From unit's exact kilograms-per-unit factor, then that kilograms amount is divided by the To unit's own factor. The metric factors (milligram, gram, metric ton) are exact powers of ten; the imperial and US factors (ounce, pound, stone, US short ton, UK long ton) are all derived from one exact defined value, the international pound of 0.45359237 kilograms.
What is the difference between weight and mass?
Mass is the amount of matter in an object and does not change with location; weight is the force gravity exerts on that mass and varies slightly with location. In everyday use on Earth the two are treated as interchangeable, and every unit here - kilograms, pounds, ounces, stone, tons - is used for both. This tool converts the quantity you enter regardless of which sense you mean.
How many pounds are in a kilogram?
One kilogram is approximately 2.2046 pounds, from the exact definition that one pound equals 0.45359237 kilograms. Going the other way, one pound is about 0.4536 kilograms. Enter any value above to convert an exact amount in either direction.
What is a stone in weight?
A stone is a unit of mass equal to exactly 14 pounds, or about 6.3503 kilograms. It is still used in the United Kingdom and Ireland for body weight - for example, 11 stone is 154 pounds or roughly 70 kilograms. The word stone is used unchanged for the plural.
What is the difference between a tonne, a US ton and a UK long ton?
They are three different units. A tonne (metric ton) is exactly 1,000 kilograms, about 2,204.6226 pounds. A US short ton is exactly 2,000 pounds, which is exactly 907.18474 kilograms. A UK long ton is exactly 2,240 pounds, or exactly 1,016.0469088 kilograms, so one long ton is exactly 1.12 short tons. Because the word ton on its own can mean any of them, check which one a figure uses before converting it.
How many grams are in an ounce?
An ounce is exactly 28.349523125 grams - about 28.35 grams for everyday use - because it is defined as one sixteenth of the 0.45359237-kilogram pound. That is the ordinary (avoirdupois) ounce used for food, parcels and body weight.
Is an ounce the same as a troy ounce?
No. Food, postage and body weight use the avoirdupois ounce of 28.349523125 grams. Gold, silver and other precious metals are priced in troy ounces, which are exactly 31.1034768 grams, roughly 9.7 percent heavier. This converter uses the avoirdupois ounce.
Is an ounce the same as a fluid ounce?
No. An ounce measures mass, while a fluid ounce measures volume, so the two only line up for a particular substance. A US fluid ounce of water at room temperature weighs about 1.04 ounces. To convert fluid ounces, use the Volume Converter instead.
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