Ounces to Grams Calculator
Conversion factor used: 1 ounce = 28.349523125 grams.
If you need to calculate ounces to grams quickly, this page gives you both: an instant oz-to-g calculator and a practical guide to understanding the conversion. Whether you're cooking, meal prepping, buying ingredients, or following a nutrition plan, using grams can make measurements far more precise.
How to convert ounces to grams
The formula is simple:
grams = ounces × 28.349523125
So if you have 4 ounces, multiply 4 by 28.349523125:
4 oz = 113.3980925 g (commonly rounded to 113.4 g).
Quick mental estimate
For rough daily use, you can round 1 oz to 28.35 g (or even 28 g when speed matters). This helps when you need a fast estimate and don’t require lab-level precision.
Common ounce to gram conversions
| Ounces (oz) | Grams (g) |
|---|---|
| 0.5 oz | 14.17 g |
| 1 oz | 28.35 g |
| 2 oz | 56.70 g |
| 3 oz | 85.05 g |
| 3.5 oz | 99.22 g |
| 4 oz | 113.40 g |
| 8 oz | 226.80 g |
| 12 oz | 340.19 g |
| 16 oz (1 lb) | 453.59 g |
When this conversion is useful
- Cooking and baking: Many international recipes list ingredients in grams instead of ounces.
- Nutrition tracking: Food labels and fitness apps often prefer gram measurements.
- Coffee brewing: Precision in grams improves consistency for espresso and pour-over recipes.
- Mailing and shipping: Product weights may need metric units in some systems and forms.
- Science and lab work: Grams are standard in most technical and educational settings.
Ounces (weight) vs fluid ounces (volume)
This is the most common source of confusion. The calculator above converts ounces of weight (oz) to grams (g). That is a mass/weight conversion.
Fluid ounces (fl oz) measure volume, not weight. Converting fluid ounces to grams depends on the substance density. For example, 1 fl oz of water has a different gram value than 1 fl oz of honey or flour.
Tips for accurate conversions
1) Use a digital scale when possible
Even with perfect conversion math, actual measuring cups and scoops can vary. A digital scale in grams eliminates guesswork.
2) Choose the right precision
For most kitchen tasks, 1–2 decimal places are enough. For nutrition or scientific use, 3–4 decimals can be helpful.
3) Round consistently
If you're logging food or ingredients over time, use the same rounding rule each day to stay consistent.
FAQ: calculate ounces to grams
How many grams are in 1 ounce?
1 ounce = 28.349523125 grams, usually rounded to 28.35 g.
How many grams are in 8 ounces?
8 oz equals 226.796185 g, commonly rounded to 226.8 g.
How many grams are in 16 ounces?
16 oz equals 453.59237 g, which is very close to 454 g (and equals 1 pound).
Can I use 28 grams per ounce?
Yes, for rough estimates. But for accuracy, use 28.3495 g per oz.
Bottom line
If you need to calculate ounces to grams, multiply ounces by 28.349523125 or use the calculator above for instant results. It’s fast, accurate, and especially helpful for cooking, meal prep, and any workflow that depends on consistent measurements.