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العربيةMass converter — kg, g, lb, oz, stone and tonnes
Weigh a parcel in pounds and ounces, price scrap metal in tonnes, or read a recipe written in grams — eleven mass units stay in view at the same time, and the figures below are exact, not rounded.
How to use it
- 1
Type into any row — say kg or lb. The results appear immediately, no button needed.
- 2
Need a combined figure? Fill in two rows, for example kg and g, and they are added together before converting.
- 3
Set how many digits you want (4–12) and click a result to copy the plain number.
Exact conversion factors
These are the definitions the calculator uses. Nothing here is rounded for convenience — where a value is exact by definition, it says so.
- 1 lb = 0.45359237 kg exactly (1959 international agreement)
- 1 kg = 2.20462262 lb = 35.2739619 oz
- 1 oz = 28.3495231 g · 1 st = 6.35029318 kg
- 1 t = 1000 kg · 1 US ton = 907.18474 kg · 1 UK ton = 1016.0469088 kg
kg = lb × 0.45359237 · lb = kg ÷ 0.45359237 · g = kg × 1000 · oz = lb × 16Mass conversion table — every unit
One of each unit, converted into the three units people ask for most.
| Unit | kg | lb | g |
|---|---|---|---|
| 1 t | 1 000 kg | 2 204.62 lb | 1 000 000 g |
| 1 kg | 1 kg | 2.20462 lb | 1 000 g |
| 1 g | 0.001 kg | 0.00220462 lb | 1 g |
| 1 mg | 0.000001 kg | 0.00000220462 lb | 0.001 g |
| 1 µg | 0.000000001 kg | 0.00000000220462 lb | 0.000001 g |
| 1 ct | 0.2 kg | 0.440925 lb | 200 g |
| 1 lb | 0.453592 kg | 1 lb | 453.592 g |
| 1 oz | 0.0283495 kg | 0.0625 lb | 28.3495 g |
| 1 st | 6.35029 kg | 14 lb | 6 350.29 g |
| 1 US ton | 907.185 kg | 2 000 lb | 907 185 g |
| 1 UK ton | 1 016.05 kg | 2 240 lb | 1 016 050 g |
kg → lb, g — quick values
| kg | lb | g |
|---|---|---|
| 0.5 kg | 1.10231 lb | 500 g |
| 1 kg | 2.20462 lb | 1 000 g |
| 2 kg | 4.40925 lb | 2 000 g |
| 3 kg | 6.61387 lb | 3 000 g |
| 5 kg | 11.0231 lb | 5 000 g |
| 10 kg | 22.0462 lb | 10 000 g |
| 20 kg | 44.0925 lb | 20 000 g |
| 25 kg | 55.1156 lb | 25 000 g |
| 50 kg | 110.231 lb | 50 000 g |
| 100 kg | 220.462 lb | 100 000 g |
| 250 kg | 551.156 lb | 250 000 g |
| 1 000 kg | 2 204.62 lb | 1 000 000 g |
How this converter works
Most converters make you pick a pair of units and then start over when the pair changes. This one works the other way round: whatever you type in any field becomes part of one total, and every other unit updates from that total. Enter 2 lb in one row and 6 oz in another and you get a single answer of 1077.28 g, not two separate ones.
The pound used here is the international avoirdupois pound of exactly 0.453 592 37 kg, agreed between the English-speaking standards bodies in 1959. Everything imperial on the page — ounce, stone, short ton, long ton — is derived from that one number, so results stay consistent no matter which row you start in.
Notes and abbreviations
- t — tonne, the metric ton of 1000 kg (not the same as a US or UK ton)
- lb — pound; 16 oz make a pound, 14 lb make a stone
- US ton — short ton, 2000 lb; UK ton — long ton, 2240 lb
- ct — metric carat, fixed at 200 mg and used for gemstones
Questions
Is a tonne the same as a ton?
No. A tonne is 1000 kg. A US short ton is 907.18474 kg and a UK long ton is 1016.0469088 kg — a 12 percent spread between the three.
How do I convert my weight from stone to kilograms?
Put the stone figure in the stone row and the leftover pounds in the pound row. 11 st and 4 lb comes out as 71.668 kg.
Why does the ounce field show a long decimal?
An ounce is 28.349523125 g exactly, so most conversions land on a repeating figure. Lower the precision selector if you want a rounder answer.