Oz to Kg Converter

1. Leave the direction on Ounces to kilograms, or pick kilograms to ounces.
2. Enter the weight in ounces. Use the number on the label or the scale, decimals included.
3. Read the kilograms at the top. Grams, a pounds and ounces split and a troy ounce check follow below.

What each line of the result shows:

An ounce to kilogram conversion states a weight in avoirdupois ounces (oz) as the same mass in kilograms (kg), the SI base unit of mass. One ounce is a small unit: 1 kg holds a little over 35 ounces.

The avoirdupois ounce is 437.5 grains, or exactly 28.349523125 grams, according to NIST Handbook 44. UK law gives the same ounce as 1/16 of the pound, and fixes the pound at 0.45359237 kilogram. Both countries therefore share one ounce, down to the last digit.

This page suits anyone who reads ounces on a US label but works in metric: cooks, lab students, online sellers and travellers. It is not for fluid ounces, which measure volume, and not for troy ounces used for gold, though it shows a troy check line.

You multiply the ounces by 0.028349523125, because that is how many kilograms one ounce holds.

1. Start from the definition: 1 lb = 0.45359237 kg exactly.
2. Divide by 16, since 16 oz make a pound: 0.45359237 / 16 = 0.028349523125 kg per ounce.
3. Multiply your ounces by that number. For 10 oz: 10 x 0.028349523125 = 0.28349523125 kg.

The factor ends after 12 decimal places, so it is exact. The reverse factor, 35.27396195 oz per kg, never ends. That is why the tool divides by the exact number instead of multiplying by a rounded one.

A steak. A butcher sells a 12 oz steak. 12 x 0.028349523125 = 0.3402 kg, or about 340 g.

A food can. A can says 14.5 oz net weight. 14.5 x 0.028349523125 = 0.4111 kg. A metric recipe that asks for 400 g needs just under one can.

A large jar. A jar of peanut butter holds 40 oz. That is 1.134 kg, or 2 lb 8 oz. For the grams alone, the kg to grams converter moves the decimal for you.

Kilograms back to ounces. A parcel weighs 2.2 kg. 2.2 / 0.028349523125 = 77.60 oz, which is 4 lb 13.60 oz.

Each row is ounces x 0.028349523125, computed exactly and then rounded: kilograms to 4 decimals, grams to 2.

Kilograms to Ounces Chart

The reverse table uses kg / 0.028349523125, with ounces rounded to 2 decimals.

The factor is fixed, so only the kind of ounce and your rounding can change the answer.

Avoirdupois or Troy

A troy ounce is 480 grains, not 437.5, so it is 9.71 percent heavier. Fifty troy ounces are 1.5552 kg; fifty everyday ounces are only 1.4175 kg.

Weight or Volume

An "oz" on a drink is usually a fluid ounce. One US fluid ounce of water weighs about 29.6 g, which is 1.04 avoirdupois ounces. Oil weighs less, and syrup weighs more.

Net Weight vs Gross Weight

Food labels state net weight, the food without the pack. A parcel scale weighs the box too, so the two ounce figures differ.

Decimal Places

Kilograms carry a lot of zeros for small items: 1 oz is 0.0283 kg. Grams are easier to read below 1 kg, so the tool shows both.

Most of what you weigh uses the avoirdupois ounce. Precious metals are the main exception. NIST states that precious metals priced by weight are sold in troy units or SI units.

Gemstones use a third unit again, the metric carat of 200 mg. The carat to kilogram converter covers it.

Cooking from US Recipes

US recipes and packs list ounces. A metric kitchen scale reads grams or kilograms. Converting 6 oz of pasta gives 0.1701 kg, or 170 g.

Selling and Shipping

Sellers who weigh in ounces often face carriers or buyers abroad who quote kilograms. A 20 oz item is 0.567 kg before packing.

Science and School Work

SI units are required in most lab reports. A 5 oz sample is 0.1417 kg, which drops straight into a density or force formula.

Liquids by Volume

A recipe listing fluid ounces needs a volume conversion first. The fluid ounces to mL converter handles that step.

These shortcuts trade a little accuracy for speed. Each error is stated so you know when to trust it.

• Divide by 35. 70 oz / 35 = 2 kg. The true answer is 1.9845 kg, so this is 0.78 percent high.
• Times 0.028. 10 oz x 0.028 = 0.28 kg. This runs 1.2 percent low.
• Times 0.03. Quick, but 5.8 percent high. Fine for a rough guess only.
• 16 oz is about 0.45 kg. One pound is 0.4536 kg, so this is 0.8 percent low.

To split ounces into pounds first, the pounds to ounces converter works with the exact 16 ounce pound.

1. Using a Fluid Ounce as a Weight

Eight fluid ounces of honey weigh far more than 8 ounces. Convert volume to millilitres, then use the density of the liquid.

2. Pricing Gold with Everyday Ounces

Using 28.35 g for a troy ounce understates the metal by 2.75 g per ounce. Always check which ounce a price quotes.

3. Rounding the Factor Too Early

Using 0.03 kg per ounce on 100 oz gives 3 kg. The real answer is 2.835 kg, an error of 165 g.

4. Dropping a Zero

1 oz is 0.0283 kg, not 0.283 kg. Check the answer in grams (28.35 g) when in doubt.

5. Mixing Up Oz to Kg and Kg to Oz

Ounces to kilograms makes the number smaller. A result bigger than your input means you multiplied by 35 by mistake.

The avoirdupois conversion is exact, because the ounce is defined through the 0.45359237 kg pound.

One kilogram is 35.274 avoirdupois ounces. The full value is 35.27396195 oz, from 1 divided by 0.028349523125.

No. 16 oz is one pound, which is 0.45359237 kg. You need about 35.27 oz to make 1 kg.

100 oz is 2.835 kg. The exact figure is 2.8349523125 kg.

Half a kilogram is 17.637 oz, or 1 lb 1.64 oz. So 500 g is a little more than one pound.

32 oz is 0.9072 kg. That is 2 pounds, just under 1 kg.

Yes. The avoirdupois ounce is 28.349523125 g in both. Only the fluid ounce differs: 29.57 mL in the US and 28.41 mL in the UK.

One troy ounce is exactly 0.0311034768 kg, or 31.1034768 g. One kilogram holds 32.15 troy ounces.

The ounce comes from the pound, and the pound was tied to the kilogram at 0.45359237 kg. Dividing that by 16 gives 28.349523125 g.

Use grams below 1 kg. A 3 oz item is 85.05 g, which is easier to read than 0.08505 kg.

250 g is 8.818 oz. That is a little over half a pound.

No. The conversion runs in your browser and nothing is sent to our servers. A result you choose to Save stays in this browser only.

• Ounce (avoirdupois) and ounce (troy) to kilogram conversion factors (NIST SP 811, Appendix B.8).
• Avoirdupois ounce = 437.5 grains = 28.349523125 grams; troy ounce = 480 grains (NIST Handbook 44, 2026, Appendix C).
• Ounce = 1/16 pound, pound = 0.45359237 kg and ounce troy = 0.0311034768 kg in UK law (Weights and Measures Act 1985, Schedule 1, legislation.gov.uk).
• Precious metals sold by troy weight or SI units (NIST Office of Weights and Measures).