Enter protein values
Protein grams measure protein mass. They do not equal food weight.
Formula used
Grams = ounces × 28.349523125
The converter uses the international avoirdupois ounce. Results retain precision before the selected rounding step. This approach keeps every displayed conversion consistent and reliable.
How to use this calculator
- Select the conversion direction.
- Enter protein grams or ounces.
- Choose servings and decimal precision.
- Add a daily goal or body weight.
- Add foods for a combined total.
- Select calculate to view detailed results.
- Copy, print, or export the result.
Common protein conversions
| Protein grams | Protein ounces | Approximate fraction |
|---|---|---|
| 5 g | 0.1764 oz | 3/16 oz |
| 10 g | 0.3527 oz | 3/8 oz |
| 20 g | 0.7055 oz | 11/16 oz |
| 25 g | 0.8818 oz | 7/8 oz |
| 30 g | 1.0582 oz | 1 1/16 oz |
| 40 g | 1.4110 oz | 1 7/16 oz |
| 50 g | 1.7637 oz | 1 3/4 oz |
| 75 g | 2.6455 oz | 2 5/8 oz |
| 100 g | 3.5274 oz | 3 1/2 oz |
Important measurement note
Protein grams describe the protein inside a food. Total food weight includes water, fat, and carbohydrates. Always read nutrition labels for exact serving information first.
Browser calculation history
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Frequently asked questions
How many grams are in one ounce?
One avoirdupois ounce equals exactly 28.349523125 grams. This calculator applies that constant to every conversion. Rounded displays depend on your selected decimal precision setting.
Is 30 grams of protein 30 grams of food?
No, protein grams describe only the protein content. Food also contains water, fats, and carbohydrates. Check total serving weight on the nutrition label carefully.
Can I convert ounces back to grams?
Yes, choose ounces to grams from the menu. Enter the ounce value and select calculate. The result includes grams and several related measurement units.
Why does the fractional ounce differ slightly?
Fractional ounces use the nearest sixteenth for convenience. Decimal ounces preserve much more conversion precision. Use decimal results for nutrition tracking and calculations.
Can I calculate protein per serving?
Yes, enter the total amount and serving count. The calculator divides grams and ounces equally. Decimal servings are supported for flexible portion planning.
How does the daily target estimator work?
It multiplies body weight in kilograms by your factor. Pound values are converted into kilograms first. Individual needs vary, so seek professional dietary guidance.
Can I add several foods together?
Yes, add rows for each food item. Enter protein grams from each nutrition label. The calculator totals every valid food entry automatically.
Does the calculator save my information?
Custom presets and history use browser local storage. They remain on your current browser only. Clearing browser data can remove these saved entries.
What decimal precision should I choose?
Four decimals work well for most conversions. More decimals provide detailed calculation accuracy. Fewer decimals create simpler results for everyday use.
Can I export the calculation?
Yes, use the CSV or PDF buttons. You can also copy or print results. Exported files include the main conversion and details.
Is this medical or nutrition advice?
No, this calculator provides mathematical conversions only. Protein needs depend on many personal factors. Consult a qualified professional for individualized nutrition advice.