Ounces to Grams Converter
Convert ounces to grams — one ounce is 28.3495 g. Results update as you type; exact factors shown.
One ounce is 28.3495 grams — see the exact factor, not a rounded rule of thumb.
How the ounces to grams converter works
Mass converts through the kilogram. The avoirdupois pound has been exactly 0.45359237 kg since 1959, so an ounce is 28.349523125 g and a stone (14 lb) is 6.35029318 kg. A US short ton is 2,000 lb; an imperial long ton is 2,240 lb; a metric tonne is 1,000 kg.
The US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common mass conversions
| From | To | Units |
|---|---|---|
| 0.5 oz | 14.1748 g | ounces to grams |
| 1 oz | 28.3495 g | ounce to grams |
| 2 oz | 56.699 g | ounces to grams |
| 3 oz | 85.0486 g | ounces to grams |
| 4 oz | 113.3981 g | ounces to grams |
| 5 oz | 141.7476 g | ounces to grams |
| 6 oz | 170.0971 g | ounces to grams |
| 8 oz | 226.7962 g | ounces to grams |
| 10 oz | 283.4952 g | ounces to grams |
| 12 oz | 340.1943 g | ounces to grams |
| 16 oz | 453.5924 g | ounces to grams |
| 32 oz | 907.1847 g | ounces to grams |
Units in this converter and their exact factors
| Unit | Symbol | One unit in kilograms |
|---|---|---|
| milligram | mg | 0.000001 kilogram |
| gram | g | 0.001 kilogram |
| kilogram | kg | 1 kilogram |
| tonne (metric ton) | t | 1,000 kilogram |
| ounce | oz | 0.0283495231 kilogram |
| pound | lb | 0.45359237 kilogram |
| stone | st | 6.35029318 kilogram |
| US ton (short) | US ton | 907.18474 kilogram |
| imperial ton (long) | long ton | 1,016.0469088 kilogram |
FAQFrequently asked questions about mass conversion
How many grams is 1 oz?
28.3495 g.
What is 4 oz in grams?
113.4 g — the quarter-pound.
How many ounces in a pound?
Sixteen, so 16 oz is 453.6 g.
Is a troy ounce different?
Yes — the troy ounce used for precious metals is 31.103 g, about 10% heavier. This page uses the ordinary avoirdupois ounce.
Why do recipes mix ounces and grams?
Older recipes were written in ounces; grams are more precise for baking, which is why most modern ones give both.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.