This converter turns ounces into kilograms instantly, using the exact factor 1 ounce = 0.02834952313 kilograms. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
The avoirdupois ounce, exactly 28.349523125 grams — standard in US recipes. The SI base unit of mass, redefined in 2019 in terms of the Planck constant.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
ounces- The amount you are converting, measured in ounces
0.02834952313- The exact number of kilograms in one ounce
kilograms- The converted result
How it works, step by step
- Enter the number of ounces you want to convert.
- The value is multiplied by 0.02834952313, the exact conversion factor.
- The result is displayed in kilograms, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 ounces
Multiply 5 by 0.028349523. That gives 0.141748 kilograms. A quick sanity check: one ounce is smaller than one kilogram, so the number should get smaller — and it does.
Converting 72 ounces
72 × 0.028349523 = 2.0412 kilograms. Working backwards, 2.0412 ÷ 0.028349523 returns 72 ounces, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many kilograms are in one ounce?
Exactly 0.02834952313. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert ounces to kilograms?
Kilograms = ounces × 0.02834952313. To reverse it, divide instead: ounces = kilograms ÷ 0.02834952313, which is the same as multiplying by 35.27396195.
Is the ounce bigger than the kilogram?
No. One ounce is only 0.0283495 of a kilogram, so the kilogram is the larger unit.
Why does my answer differ slightly from other ounces to kg converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a ounce?
The avoirdupois ounce, exactly 28.349523125 grams — standard in US recipes.
What is a kilogram?
The SI base unit of mass, redefined in 2019 in terms of the Planck constant.
Ounces to kilograms reference table
| Ounces | Kilograms |
|---|---|
| 0.5 oz | 0.014175 kg |
| 1 oz | 0.02835 kg |
| 2 oz | 0.056699 kg |
| 3 oz | 0.085049 kg |
| 5 oz | 0.141748 kg |
| 10 oz | 0.283495 kg |
| 15 oz | 0.425243 kg |
| 20 oz | 0.56699 kg |
| 25 oz | 0.708738 kg |
| 50 oz | 1.4175 kg |
| 75 oz | 2.1262 kg |
| 100 oz | 2.835 kg |
| 250 oz | 7.0874 kg |
| 500 oz | 14.1748 kg |
| 1000 oz | 28.3495 kg |
Exact factor: 1 ounce = 0.02834952313 kilograms. Values rounded for display.