Convert between ounces (oz) and kilograms (kg) for weight measurements. Supports both avoirdupois (everyday items) and troy (precious metals) ounces.
Conversion Factors:
1 Avoirdupois Ounce = 0.0283495 kg | 1 Kilogram = 35.27396 avoirdupois ounces
kg = oz × 0.0283495 | oz = kg ÷ 0.0283495
*Toggle below for troy ounces (used for gold, silver, precious metals)
Accepts decimal values (e.g., 16 oz = 0.4536 kg)
Display format:
Quick conversions - click to auto-fill (avoirdupois):
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Units of weight from different measurement systems - imperial/US customary and metric
Typical items and their approximate weights in both units:
| Item | Ounces (oz) | Kilograms (kg) |
|---|---|---|
| Standard envelope (empty) | 0.25 oz | 0.007 kg |
| Medium apple | 5-6 oz | 0.14-0.17 kg |
| Can of soda | 12 oz | 0.34 kg |
| 1 pound (avoirdupois) | 16 oz | 0.4536 kg |
| Bag of sugar (5 lb) | 80 oz | 2.268 kg |
| Average newborn baby | 113-158 oz | 3.2-4.5 kg |
| Gold bar (1 troy ounce) | 1 troy oz ≈ 1.097 oz | 0.0311 kg |
Common weight conversions for everyday items, cooking, and commerce
Ounce Type:
| Ounces (oz) | = | Kilograms (kg) | Common Reference |
|---|---|---|---|
| 1 oz | = | 0.02835 kg | Slice of bread |
| 4 oz | = | 0.1134 kg | Stick of butter |
| 8 oz | = | 0.2268 kg | 1 cup of water |
| 16 oz | = | 0.4536 kg | 1 pound (lb) |
| 32 oz | = | 0.9072 kg | Small bag of flour |
| 100 oz | = | 2.835 kg | Medium bag of rice |
| 352.74 oz | = | 10 kg | Small pet or large bag of dog food |
Avoirdupois ounces are used for everyday items. Troy ounces are used for precious metals (1 troy oz ≈ 31.1035g).
Common questions about ounces, kilograms, and weight conversions
These are two distinct systems for measuring weight with different historical origins:
Avoirdupois Ounces (everyday use):
1 oz = 28.3495 grams
16 oz = 1 pound (avoirdupois)
Used for most everyday items, food, and general merchandise
Troy Ounces (precious metals):
1 oz = 31.1035 grams
12 troy oz = 1 troy pound
Used exclusively for gold, silver, platinum, and other precious metals
A troy ounce is approximately 10% heavier than an avoirdupois ounce (1 troy oz ≈ 1.097 avoirdupois oz).
The number of ounces in a kilogram depends on the type of ounce:
Avoirdupois ounces (everyday):
1 kilogram = 35.27396 avoirdupois ounces
So 1 oz = 1 kg ÷ 35.27396 ≈ 0.0283495 kg
Troy ounces (precious metals):
1 kilogram = 32.1507466 troy ounces
So 1 troy oz = 1 kg ÷ 32.1507466 ≈ 0.0311035 kg
For practical purposes, people often use approximate conversions: 1 kg ≈ 35.27 oz (avoirdupois) or 1 kg ≈ 32.15 troy oz.
These are completely different units that are often confused:
For example, 1 fluid ounce of water weighs approximately 1 avoirdupois ounce, but this relationship doesn't hold for other substances with different densities.
In 2019, the International Bureau of Weights and Measures redefined the kilogram to be based on a fundamental physical constant rather than a physical artifact:
This change doesn't affect everyday weight measurements but ensures the kilogram remains accurate and consistent across time and locations.
Common scenarios requiring ounce-to-kilogram conversion include:
Accurate conversion is especially important for commercial purposes, where weight differences can affect pricing, shipping costs, or regulatory compliance.
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