Ounce to Gram Converter
Convert ounces to grams instantly. Free ounces to grams calculator with formula, examples and FAQs.
Quick answer
1 ounces equals 28.3495 grams. To convert ounces to grams, multiply the ounces value by 28.3495 — so 10 ounces = 283.495 grams. This factor is exact, and the reverse conversion (grams to ounces) simply divides by 28.3495 instead of multiplying.
Converted value
28.35
1.00 ounces = 28.35 grams
What is ounces to grams?
Going from ounces to grams keeps the underlying weight the same — only the unit changes. Because ounces is the unit bakers and metric cooks tend to start with, this direction is especially useful. Apply grams = ounces × 28.3495 and the result is precise every time.
Real-world uses: why convert ounces to grams?
Converting ounces to grams bridges two ways of measuring the same thing. People do it most often when converting US recipe amounts to grams, and on the receiving side when measuring coffee, spices and supplements. Having the exact value — not a rough estimate — prevents costly mistakes in paperwork, purchases and planning.
- •Converting US recipe amounts to grams.
- •Reading food packaging in metric.
- •Weighing letters and small items.
- •Measuring precious metals and ingredients.
- •Measuring coffee, spices and supplements.
Who uses this conversion?
How the ounces to grams conversion is calculated
This is the same arithmetic that calculators and search engines use — no rounded shortcuts.
grams = ounces × 28.3495
- Both ounces and grams are defined in terms of the same base unit, the gram.
- 1 ounces = 28.349523 gram, and 1 grams = 1 gram.
- Divide one definition by the other to get the conversion factor: 28.349523 ÷ 1 = 28.34952.
- So grams = ounces × 28.3495. Multiply any ounces value by 28.34952 to get the result in grams.
Precision: Mass factors are exact by definition, so no precision is lost in the maths. The displayed value is rounded to four decimal places for readability.
Example calculations
- •1 ounces = 28.3495 grams
- •8 ounces = 226.7962 grams
- •16 ounces = 453.5924 grams
ounces to grams quick reference table
Common ounces values converted to grams, each calculated with the exact factor.
| ounces | grams |
|---|---|
| 10 | 283.4952 |
| 25 | 708.7381 |
| 50 | 1417.4762 |
| 100 | 2834.9523 |
| 250 | 7087.3808 |
| 500 | 14174.7616 |
| 1000 | 28349.5231 |
| 2500 | 70873.8078 |
| 5000 | 141747.6156 |
| 10000 | 283495.2313 |
Common mistakes to avoid
- •Converting in the wrong direction — multiplying when you should divide (or vice versa). Sanity-check whether grams should come out larger or smaller than ounces.
- •Rounding too early. Keep full precision during the calculation and round only the final grams value.
- •Confusing mass units (kg, g) with imperial weight (lb, oz) and applying the wrong base factor.
Common questions about weight conversions
Is this weight conversion exact?
Yes. Mass definitions such as 1 lb = 0.45359237 kg and 1 oz = 28.349523 g are exact, so results are precise to the decimals shown.
Why do my results differ slightly?
Usually because of a rounded factor (2.2 instead of 2.204623) or mixing mass with force. We use the full-precision international factors.
Metric or imperial for weight?
Metric (kg, g) dominates science and most of the world; imperial (lb, oz, stone) is common for US and UK body weight and cooking. Convert exactly here rather than estimating.
Can I round the result?
Yes — kitchen and body-weight values rarely need more than one decimal. Keep more precision for lab or trade use and round last.
History of these units
History of the ounce
imperial / US customary
The ounce comes from the Roman uncia, one-twelfth of a pound. The avoirdupois ounce is now 1/16 of a pound — about 28.35 grams — and is common in US recipes and postage.
History of the gram
metric
The gram was originally defined as the mass of one cubic centimetre of water. It became the base of the metric mass system and is the everyday unit for food, medicine and small quantities.
Related converters
More weight conversions
Popular conversions
Support
Frequently asked questions
How do I convert ounces to grams?
What is 1 ounces in grams?
How do I convert grams back to ounces?
When would I need to convert ounces to grams?
Is the ounces to grams factor exact?
Is my data private when I use this ounces to grams converter?
Learn more