HowMuchIt / Grams in an ounce
How many grams in an ounce?
28.35: one everyday ounce is 28.349523125 grams, by definition. Sixteen of them make a pound, about 453.6 grams. The converter handles grams, ounces, pounds, kilograms and troy ounces.
Convert ounces, grams and pounds
1 ounce = 28.349523125 g (28.35). 16 ounces in a pound = 453.59237 g. A troy ounce, for gold and silver, is 31.1034768 g.
The everyday ounce and the troy ounce
The ounce on a food label or a kitchen scale is the avoirdupois ounce, 28.35 grams. Gold, silver and other precious metals use the troy ounce, 31.1 grams, about ten percent heavier. So a "one-ounce" gold coin weighs more than an ounce of anything in your kitchen. A fluid ounce is different again: it measures volume, so how many grams it weighs depends on what is in the cup.
Questions people ask
How many grams in a pound?
About 453.6; exactly 0.45359237 kilograms.
How many ounces in a pound?
16.
How many grams of coffee per cup?
The Specialty Coffee Association's figure is 55 grams per liter of water, about 8 grams for a 5 fluid ounce cup.
Good to know
- One ounce (avoirdupois, the everyday ounce) is exactly 28.349523125 grams, usually rounded to 28.35 g.1,2
- There are 16 ounces in a pound.1,3,4
- One pound is exactly 0.45359237 kg, or about 453.6 grams.2,3,5
- A troy ounce is 31.1034768 grams, heavier than an everyday ounce.1,2
- Gold, silver and other precious metals are weighed in troy ounces, not everyday ounces.1,6
- A fluid ounce is a unit of volume, not weight, so grams per fluid ounce depend on the ingredient.7,8
- A US fluid ounce is 29.57 ml (a UK fluid ounce is 28.41 ml).2,7
How we checked this page
Checked on October 27, 2026. We kept a fact only when two independent publishers agree, and each one is numbered to its sources below. Where sources give different numbers, we keep only what they share. We never write a price. This page was written with an AI assistant and checked against the sources below.
Sources
- Ounce, Wikipedia (unit definition)
- NIST Guide to the SI, Appendix B.9: Factors for units listed by kind of quantity, NIST
- Avoirdupois weight, Encyclopaedia Britannica
- Measurement Conversions for Recipes (HGIC 4260), Clemson Cooperative Extension
- Pound (mass), Wikipedia (unit definition)
- Troy weight, Encyclopaedia Britannica
- Fluid ounce, Wikipedia (unit definition)
- Culinary Measurement Tips, NIST Office of Weights and Measures