Oz ⇔ grams
Convert ounces to grams. Works both ways. Instant
Welcome to the most simple, accurate and reliable OZ to Grams converter available online! Whether you are cooking, baking, following a recipe, tracking nutrition, weighing ingredients, shipping a package, or working in a science lab, converting between ounces (oz) and grams (g) is one of the most frequent weight conversions you will ever need.
Our free bidirectional weight converter works both ways:
⚖️ OZ → Grams (Ounces to Grams)
⚖️ Grams → OZ (Grams to Ounces)
Ounces ⇔ Grams Converter
Convert weight measurements instantly
How many grams are in an ounce?
1 ounce = 28.3495 grams
This is the internationally standardized conversion for the avoirdupois ounce — the standard ounce used in everyday measurements, cooking, nutrition, and shipping.
⚠️ Note: The troy ounce (used for precious metals like gold and silver) = 31.1035 grams
Why do the US and UK use ounces while most countries use grams?
The ounce is rooted in the Imperial measurement system, historically used across the British Empire. While the United Kingdom officially adopted the metric system, ounces are still commonly referenced in everyday British life — particularly for body weight, food portions, and beverages (e.g., a pint of beer = 20 fl oz in the UK).
The United States has retained the Imperial system for most everyday measurements, including weight, despite using metric units in science and medicine. The rest of the world predominantly uses grams and kilograms as part of the globally standardized metric system.
Is oz the same as fl oz (fluid ounce)?
No — oz and fl oz are completely different units!
| Unit | Measures | Equal To |
|---|---|---|
| oz (ounce) | Weight / Mass | 28.3495 grams |
| fl oz (fluid ounce) | Volume / Liquid | 29.5735 ml (US) |
- Ounces (oz) measure how heavy something is
- Fluid ounces (fl oz) measure how much liquid volume something has
For example:
- A bottle of water might be labeled 16 fl oz (volume)
- A chicken breast might weigh 6 oz (weight/mass)
Never confuse the two — especially in cooking and nutrition!
dult readers
How accurate is this converter?
Our converter uses the exact internationally standardized conversion factor:
1 ounce = 28.349523125 grams (exact)
Results are displayed to up to 5 decimal places for maximum precision — suitable for everyday cooking, professional nutrition tracking, pharmaceutical applications, and scientific use.