1 ounce to grams
1 ounce = 28.3495 grams
Formula: grams = ounces x 28.3495
One ounce is the base small-weight unit in American kitchens and post offices, and its gram value is needed whenever a US measurement has to fit a metric recipe or shipping label.
How to Convert ounces to grams
The ounce-to-gram factor is exact. One avoirdupois ounce is defined as exactly 28.349523125 grams, derived directly from the exact pound and kilogram definitions, so the conversion never loses precision.
The formula is grams = ounces x 28.3495. Multiply your value by the factor: 1 x 28.3495 = 28.3495 grams.
The reverse is just as direct: 28.3495 grams equals 1 ounce. That symmetry is a quick way to sanity-check any conversion you make.
ounces to grams Conversion Table
Use this table to read off nearby values at a glance. The highlighted row is the 1-ounces conversion from this page.
| ounces | grams |
|---|---|
| 1 | 28.3495 |
| 2 | 56.699 |
| 3 | 85.0486 |
| 4 | 113.3981 |
| 5 | 141.7476 |
| 6 | 170.0971 |
| 7 | 198.4467 |
| 8 | 226.7962 |
| 9 | 255.1457 |
| 10 | 283.4952 |
Reverse: grams to ounces
Need to go the other way? 28.3495 grams converts back to 1 ounce. For the full breakdown in that direction, see 1 gram to ounces.
Frequently Asked Questions
How many grams are in 1 ounce?
The answer is 28.3495 grams. Since the relationship between ounces and grams is set by an exact definition, nothing here is rounded up or guessed.
Does this ounce apply to precious metals like gold?
No. This page uses the avoirdupois ounce, the everyday ounce for food and shipping, where one ounce is exactly 28.349523125 grams. Gold and silver are weighed in troy ounces, which are heavier at about 31.103 grams, so do not use this figure for bullion.
What is 28.3495 grams back in ounces?
Flip the calculation and 28.3495 grams resolves back to 1 ounce, exactly the weight you started from. The mass converters on this site confirm any reverse figure.
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Disclaimer: This calculator is for informational and educational purposes only. Results are estimates and may not reflect exact values.
Last updated: June 13, 2026