Convert ounces to kilograms (and kilograms back to ounces) for shipping, cooking, lifting, parcels and precious metals. Switch between everyday avoirdupois ounces and troy ounces, choose your decimal precision, and see the result update instantly.
Created by
Daniel Whitman
Reviewed by
Hannah Brooks
Quick rule: 1 oz ≈ 0.02835 kg (avoirdupois) and 1 kg ≈ 35.274 oz. For precious metals, 1 troy oz ≈ 0.03110 kg.
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By international agreement (1959), one avoirdupois ounce equals exactly 0.028349523125 kilograms — about 0.02835 kg. To convert ounces to kilograms the calculator multiplies your input by this factor; to go from kilograms back to ounces it divides by the same number. A handy mental rule: 1 oz ≈ 0.0283 kg and 1 kg ≈ 35.274 oz.
A troy ounce is a different unit, used almost exclusively for precious metals such as gold, silver and platinum. One troy ounce equals exactly 0.0311034768 kilograms, so 1 kg ≈ 32.151 troy oz. If you're weighing food, parcels or body weight, pick avoirdupois; if you're weighing bullion or jewellery, pick troy.
Quick benchmarks: 16 oz = 0.4536 kg (exactly one US pound), 1 lb = 0.4536 kg, and 1 stone (14 lb) = 6.35 kg.
Quick-glance charts for the most common conversions plus the official definitions of every ounce and weight unit.
| Ounces | Kilograms | Grams |
|---|---|---|
| 1 oz | 0.02835 | 28.35 |
| 2 oz | 0.0567 | 56.7 |
| 4 oz | 0.1134 | 113.4 |
| 8 oz | 0.2268 | 226.8 |
| 12 oz | 0.34019 | 340.19 |
| 16 oz | 0.45359 | 453.59 |
| 20 oz | 0.56699 | 566.99 |
| 24 oz | 0.68039 | 680.39 |
| 32 oz | 0.90718 | 907.18 |
| 48 oz | 1.36078 | 1,360.78 |
| 64 oz | 1.81437 | 1,814.37 |
| 80 oz | 2.26796 | 2,267.96 |
| 100 oz | 2.83495 | 2,834.95 |
| 160 oz | 4.53592 | 4,535.92 |
| 320 oz | 9.07185 | 9,071.85 |
| Kilograms | Ounces | Pounds |
|---|---|---|
| 0.1 kg | 3.527 | 0.2205 |
| 0.25 kg | 8.818 | 0.5512 |
| 0.5 kg | 17.637 | 1.1023 |
| 1 kg | 35.274 | 2.2046 |
| 1.5 kg | 52.911 | 3.3069 |
| 2 kg | 70.548 | 4.4092 |
| 2.5 kg | 88.185 | 5.5116 |
| 5 kg | 176.37 | 11.0231 |
| 10 kg | 352.74 | 22.0462 |
| 20 kg | 705.479 | 44.0925 |
| 50 kg | 1,763.7 | 110.231 |
| 100 kg | 3,527.4 | 220.462 |
| Troy oz | Kilograms | Grams |
|---|---|---|
| 0.1 oz t | 0.00311 | 3.11 |
| 0.25 oz t | 0.00778 | 7.776 |
| 0.5 oz t | 0.01555 | 15.552 |
| 1 oz t | 0.0311 | 31.103 |
| 2 oz t | 0.06221 | 62.207 |
| 5 oz t | 0.15552 | 155.517 |
| 10 oz t | 0.31103 | 311.035 |
| 20 oz t | 0.62207 | 622.07 |
| 50 oz t | 1.55517 | 1,555.17 |
| 100 oz t | 3.11035 | 3,110.35 |
| 1000 oz t | 31.10348 | 31,103.48 |
| Unit | Kilograms | Notes |
|---|---|---|
| Avoirdupois ounce (oz) | 0.02834952 | Everyday ounce — food, body weight, postage |
| Troy ounce (oz t) | 0.03110348 | Used for gold, silver and other precious metals |
| US pound (lb) | 0.45359237 | 16 avoirdupois ounces |
| Stone (UK) | 6.35029318 | 14 pounds — used for body weight in the UK |
| Kilogram (kg) | 1 | ≈ 35.274 avoirdupois oz · ≈ 32.151 troy oz |
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