Convert ounces to kilograms
1 oz is 0.02835 kg, or 28.35 grams, for the everyday avoirdupois ounce on US labels and in recipes. Type the ounces and the kilograms appear as you type. For gold and silver, pick the troy ounce under the fields: it weighs 0.0311 kg.
How many kilograms are in an ounce?
An avoirdupois ounce is 0.02835 kg, or 28.35 grams. The exact figure is 0.028349523125 kg, so you multiply the ounces by it: kilograms = ounces × 0.028349523125[1]. For a rough figure in your head, divide the ounces by 35; the answer comes out less than one percent too high.
Sixteen ounces make one pound, so a 16 oz package weighs 0.4536 kg. A 32 oz tub is 0.9072 kg, just short of a kilogram, and it takes 35.27 oz to reach a full kilo.
The troy ounce used for gold, silver and platinum is 0.0311 kg, exactly 0.0311034768 kg[1]. Set the Ounce type switch under the fields, and the unit next to the ounces field changes between oz and oz t. The kilograms to ounces converter works the other way round.
Where do ounces that need converting to kilograms come from?
Mostly from US recipes, US packaging and sports gear, where the ounce is a sixteenth of a pound and the two often appear together. A label reading 1 lb 8 oz means 24 ounces, which is 0.6804 kg. For smaller amounts in grams, the ounces to grams converter is quicker to read.
A birth weight such as 7 lb 6 oz works the same way. Multiply the pounds by 16 and add the ounces, which gives 118 oz, and then convert: the baby weighs 3.3452 kg. The pounds to grams converter takes the whole 7 lb 6 oz in one go.
How many kilograms does a bar in troy ounces weigh?
Bullion coins and bars are sold by the troy ounce, so their weight in kilograms comes from multiplying by 0.0311034768. A one-ounce coin holds 31.1 grams of pure metal, and a 100 oz bar weighs 3.1103 kg.
The biggest bars on the London market are weighed in ounces too. A Good Delivery gold bar contains 350 to 430 ounces of fine gold, and a silver bar 1,000 ounces with a 10 percent tolerance[2]. Four hundred ounces of gold come to 12.4414 kg, and a thousand ounces of silver to 31.1035 kg. Mine output quoted in millions of ounces goes through the ounces to tons converter.
Ounces to kilograms conversion chart
| Avoirdupois ounces | Kilograms | Troy ounces | Kilograms |
|---|---|---|---|
| 0.5 oz | 0.01417 kg | 0.5 oz t | 0.01555 kg |
| 1 oz | 0.02835 kg | 1 oz t | 0.0311 kg |
| 2 oz | 0.0567 kg | 2 oz t | 0.06221 kg |
| 3 oz | 0.08505 kg | 3 oz t | 0.09331 kg |
| 4 oz | 0.1134 kg | 4 oz t | 0.1244 kg |
| 5 oz | 0.1417 kg | 5 oz t | 0.1555 kg |
| 6 oz | 0.1701 kg | 6 oz t | 0.1866 kg |
| 8 oz | 0.2268 kg | 8 oz t | 0.2488 kg |
| 10 oz | 0.2835 kg | 10 oz t | 0.311 kg |
| 12 oz | 0.3402 kg | 12 oz t | 0.3732 kg |
| 14 oz | 0.3969 kg | 14 oz t | 0.4354 kg |
| 16 oz | 0.4536 kg | 16 oz t | 0.4977 kg |
| 18 oz | 0.5103 kg | 18 oz t | 0.5599 kg |
| 20 oz | 0.567 kg | 20 oz t | 0.6221 kg |
| 24 oz | 0.6804 kg | 24 oz t | 0.7465 kg |
| 28 oz | 0.7938 kg | 28 oz t | 0.8709 kg |
| 30 oz | 0.8505 kg | 30 oz t | 0.9331 kg |
| 32 oz | 0.9072 kg | 32 oz t | 0.9953 kg |
| 35 oz | 0.9922 kg | 35 oz t | 1.0886 kg |
| 40 oz | 1.134 kg | 40 oz t | 1.2441 kg |
| 48 oz | 1.3608 kg | 48 oz t | 1.493 kg |
| 50 oz | 1.4175 kg | 50 oz t | 1.5552 kg |
| 64 oz | 1.8144 kg | 64 oz t | 1.9906 kg |
| 72 oz | 2.0412 kg | 72 oz t | 2.2395 kg |
| 80 oz | 2.268 kg | 80 oz t | 2.4883 kg |
| 100 oz | 2.835 kg | 100 oz t | 3.1103 kg |
| 128 oz | 3.6287 kg | 128 oz t | 3.9812 kg |
| 160 oz | 4.5359 kg | 160 oz t | 4.9766 kg |
| 200 oz | 5.6699 kg | 200 oz t | 6.2207 kg |
| 400 oz | 11.3398 kg | 400 oz t | 12.4414 kg |
| 500 oz | 14.1748 kg | 500 oz t | 15.5517 kg |
| 1,000 oz | 28.3495 kg | 1,000 oz t | 31.1035 kg |
| 10,000 oz | 283.4952 kg | 10,000 oz t | 311.0348 kg |
How much do bullion coins and bars weigh in kilograms?
| Troy ounces | Kilograms |
|---|---|
| 0.1 oz t | 0.00311 kg |
| 0.25 oz t | 0.007776 kg |
| 0.5 oz t | 0.01555 kg |
| 1 oz t | 0.0311 kg |
| 2 oz t | 0.06221 kg |
| 5 oz t | 0.1555 kg |
| 10 oz t | 0.311 kg |
| 20 oz t | 0.6221 kg |
| 50 oz t | 1.5552 kg |
| 100 oz t | 3.1103 kg |
| 350 oz t | 10.8862 kg |
| 400 oz t | 12.4414 kg |
| 430 oz t | 13.3745 kg |
| 1,000 oz t | 31.1035 kg |
What number formats does this converter accept?
| What you type | What the converter shows | How we read it |
|---|---|---|
| 12.5 | 0.3544 kg | The point separates the decimals, so this is twelve and a half ounces. |
| 12,5 | 0.3544 kg | Only one digit follows the comma, so we read it as a decimal comma, the way European recipes write it. |
| 1,500 | 42.5243 kg | Three digits follow the comma, so we treat it as a thousands separator and convert fifteen hundred ounces. A note under the field shows the other possible reading, 1.5. |
| 1 500 | 42.5243 kg | A space between thousands is dropped, the way some mint and bank reports print large numbers. |
| 1.500 | 0.04252 kg | In English the point always marks decimals, so this is one and a half ounces. In a German or Spanish text the same figures would mean fifteen hundred, so a note under the field offers that reading too, 1500. |
| 3/4 | 0.02126 kg | We work out a fraction with a slash ourselves, the way a recipe writes 3/4 oz. |
| 8½ | 0.241 kg | A ½ sign copied from a recipe is added to the number before it, so this is eight and a half ounces. |
| 16 oz | 0.4536 kg | The oz pasted from a label along with the number does no harm: we take the number and skip the unit. |
How to convert ounces to kilograms with this tool
Start by working out which ounce you have, because the switch depends on it.
Check which ounce it is
Labels, recipes and product specs use the avoirdupois ounce. Coins, bars and metal prices use the troy ounce, often written oz t, ozt or with the word troy.Set the Ounce type switch
Choose Avoirdupois (oz) or Troy (oz t). The line under the switch shows how many ounces of each type make a kilogram.Enter the ounces and copy the result
The kilograms appear while you type. Copy result puts the number on your clipboard, Swap order opens the kilograms to ounces converter, and Clear all empties both fields.
Convert other units to Kilograms
Convert Ounces (oz) to other units
Sources
- Handbook 44 – 2026, Appendix C. General Tables of Units of Measurement — National Institute of Standards and Technology
- Good Delivery Rules — Technical Specifications — London Bullion Market Association
- Big Texan Steak Ranch — Wikipedia
- CONVERT function — Microsoft
Every figure in the tables was computed from the unit definitions and checked arithmetically before publication. Historical values and the names of local units come from the sources listed above.
Content last reviewed: · written and checked by the Arteon team
Frequently asked questions about ounces and kilograms
How much is the 72 oz steak in kilograms?
The 72-ounce steak at the Big Texan Steak Ranch in Amarillo weighs 2.0412 kg, or 4.5 pounds. It is free to anyone who finishes it, together with the sides, within one hour[3].
How many kilograms is a million ounces of gold?
A million troy ounces is 31,103.48 kg, a little over 31 metric tons. Mining companies often report their gold output and reserves in millions of ounces, and the ounces to tons converter turns them into tons.
Can I convert fluid ounces to kilograms?
Not directly, because a fluid ounce (fl oz) measures volume. Convert it to milliliters first and then use the density of the liquid. A milliliter of water weighs about a gram, so a US fluid ounce of water is about 29.6 grams. The ounces to milliliters converter handles the volume.
How do I convert ounces to kilograms in Excel?
=CONVERT(A1,"ozm","kg") turns the avoirdupois ounces in cell A1 into kilograms[4]. CONVERT has no troy ounce, so for gold and silver type =A1*0.0311034768.
How many kilograms is a pound?
A pound is exactly 0.45359237 kg, which is 16 avoirdupois ounces[1]. Weights given in pounds alone go through the pounds to kilograms converter.
Help us improve our tools
Write to us if a weight you need is missing from the tables or you have a question about ounces. We read every message.