Convert Ounces to Kilograms
Ounces to kilograms is the conversion for rolling up a weight given in the small imperial unit into tidy metric kilograms. One ounce is exactly 0.028349523125 kilograms, so it takes a lot of ounces to make a kilogram — the number always gets much smaller.
Ounces to Kilograms conversion table
| Ounces (oz) | Kilograms (kg) |
|---|---|
| 1 | 0.02835 |
| 2 | 0.056699 |
| 3 | 0.085049 |
| 5 | 0.141748 |
| 10 | 0.283495 |
| 20 | 0.56699 |
| 50 | 1.417476 |
| 100 | 2.834952 |
| 500 | 14.174762 |
| 1,000 | 28.349523 |
The formula
To convert ounces to kilograms, multiply the weight in ounces by 0.028349523125:
kilograms = ounces × 0.028349523125
A worked example
A carton of ingredients is listed as 32 oz and you want it in kilograms:
32 × 0.028349523125 = 0.907 kg
So 32 ounces — that's two pounds — comes out just over nine-tenths of a kilogram.
Why it's exact despite the long number
The ounce is one-sixteenth of a pound, and the pound is defined as exactly 0.45359237 kilograms, so the ounce works out to exactly 0.028349523125 kilograms. The value is long but not fuzzy — it's a precise definition, which is what lets you trust the result for anything that has to be recorded in metric.
When you'll use it
Totalling several ounce weights into one kilogram figure, converting an ounce-labelled product for a metric form or spreadsheet, comparing imperial packaging against kilogram pricing, or turning a recipe's ounce amounts into a single metric batch weight.
Frequently asked questions
How many kilograms are in an ounce?
Exactly 0.028349523125 kilograms. The avoirdupois ounce is defined as one-sixteenth of a pound, and the pound is defined in kilograms, so this value is exact.
Why is the number so tiny?
Because an ounce is a small weight — only about 28 grams — a single ounce is only a few hundredths of a kilogram. You need roughly thirty-five ounces to reach one kilogram.
Is this the ounce used for food?
Yes, this is the everyday avoirdupois ounce for food and parcels. Precious metals use troy ounces, which are a different size and factor.