Protein
30.3g
Output
128 oz
128 oz
0.8%
Inputs
Result
1 gal = 3,785 ml. Sweet whey at 0.8% protein = 3,785 × 0.008 = 30.3g protein. Liquid method = 100% yield volume = 128 oz.
Inputs
Result
2 gal = 7,570 ml. Acid whey at 0.6% = 7,570 × 0.006 = 45.4g. Evaporation at 20% yield = 256 × 0.20 = 51 oz concentrate.
Sweet whey from rennet cheese contains about 0.8% protein, which equals approximately 30 grams of protein per gallon (3,785 ml). Acid whey from yogurt or ricotta contains less at about 0.6%, yielding roughly 23 grams of protein per gallon.
| Whey Type | Protein % | Protein/Gallon | Source |
|---|---|---|---|
| Sweet Whey | 0.8% | 30g | Rennet cheeses |
| Acid Whey | 0.6% | 23g | Yogurt, ricotta |
Yes, but yield is very low for home processing. One gallon of sweet whey yields only about 8.3 ounces of dried powder (6.5% yield) containing roughly 30 grams of protein. Commercial whey protein isolate requires ultrafiltration equipment not available for home use.
Liquid whey has many uses beyond protein extraction: substitute it for water in bread recipes, use it as a cooking liquid for pasta or grains, add it to smoothies, feed it to plants or animals, or lacto-ferment vegetables with it.
Cheese making produces roughly 90% whey by volume. One gallon of milk yields about 115 oz of whey and only 12–16 oz of cheese depending on type. That means a typical 2-gallon batch produces nearly 2 gallons of liquid whey.
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Last Updated: Mar 19, 2026
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