Ounce to kg Converter — oz to Kilograms
Enter a weight in ounces (avoirdupois or troy) and the converter instantly shows the equivalent in kilograms, grams, pounds and stones, using the exact SI conversion factors.
oz
Ounce type
Exact SI conversion from ounces to kilograms
- 1
Conversion factor
1 av oz = 0.0283495231 kg = 0.0283495231Avoirdupois ounce — the everyday US/UK weight ounce; ≈ 28.35 g. - 2
Multiply ounces by factor
16 × 0.0283495231 = 0.453592
How does this calculator work?
Multiply ounces by 0.028 349 523 125 (avoirdupois) or 0.031 103 476 8 (troy) to get kilograms. 1 lb = 16 av oz = 0.453 592 kg. There are ≈ 35.274 av oz or ≈ 32.151 troy oz per kilogram. The two types of ounce differ by about 10% — always check which one is intended.
Formula
How this is calculated
The word "ounce" covers two distinct units used in different contexts. The avoirdupois ounce (commonly written oz or oz av) is the everyday unit for food, body weight and postal packages in countries that use imperial measures. One avoirdupois ounce equals exactly 28.349 523 125 grams (0.028 349 523 125 kg) by international agreement — there is no rounding involved.
The troy ounce (oz t) is used exclusively for precious metals (gold, silver, platinum, palladium) and gemstones. One troy ounce equals exactly 31.103 476 8 grams (0.031 103 476 8 kg). A troy ounce is therefore about 10 % heavier than an avoirdupois ounce. When a gold dealer quotes a price "per ounce", they always mean troy ounces; recipe books always mean avoirdupois.
The conversion is a simple multiplication: multiply the number of ounces by the appropriate factor. Both factors are defined exactly in the SI system, so there is no rounding error in the primary conversion. The secondary outputs (grams, pounds, stones) add only floating-point rounding at the display level.
Frequently asked questions
There are approximately 35.274 avoirdupois ounces in 1 kilogram (1 ÷ 0.028 349 523 125 ≈ 35.274). For troy ounces the figure is approximately 32.151 per kilogram (1 ÷ 0.031 103 476 8 ≈ 32.151).
Avoirdupois ounces (28.35 g each) are used for everyday goods; 16 av oz = 1 avoirdupois pound. Troy ounces (31.10 g each) are used in precious-metal trading; 12 troy oz = 1 troy pound. Always confirm which type of ounce is meant before converting.
No. A fluid ounce (fl oz) measures volume, not mass. 1 US fluid ounce = 29.573 mL; 1 UK fluid ounce = 28.413 mL. The weight of a fluid ounce depends on the density of the liquid — for water at 4 °C it happens to be close to 1 avoirdupois ounce, but this is a coincidence, not a definition.
Also known as
TG we-Calculate Editorial Team. (2026). Ounce to kg Converter — oz to Kilograms [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/ounce-to-kg-converter
TG we-Calculate Editorial Team. "Ounce to kg Converter — oz to Kilograms." TG we-Calculate. 2026. https://we-calculate.com/calculator/ounce-to-kg-converter.
TG we-Calculate Editorial Team, "Ounce to kg Converter — oz to Kilograms," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/ounce-to-kg-converter
@misc{wecalculate_ounce_to_kg_converter, title = {Ounce to kg Converter — oz to Kilograms}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/ounce-to-kg-converter}}, year = {2026}, note = {TG we-Calculate} }
Did this calculator help you?