One-Third Cup of Buttermilk in Grams
1/3 cup of buttermilk weighs 81.67g (2.88 oz, 80ml) according to USDA FoodData Central (1 cup buttermilk = 245g, spooned and leveled method). 1/3 cup = 0.3333 of a full cup (240ml). See the full conversion table below for all amounts from 1 tablespoon to 3 cups.
Buttermilk Cup-to-Gram Conversion Table
Full range from 1 tablespoon to 3 cups. The highlighted row shows 1/3 cup.
| Amount | Grams |
|---|---|
| 1 tbsp | 15.31g |
| 2 tbsp | 30.63g |
| 1/8 cup | 30.63g |
| 1/4 cup | 61.25g |
| 1/3 cupthis page | 81.67g |
| 1/2 cup | 122.5g |
| 2/3 cup | 163.33g |
| 3/4 cup | 183.75g |
| 1 cup | 245g |
| 1 1/4 cups | 306.25g |
| 1 1/2 cups | 367.5g |
| 1 3/4 cups | 428.75g |
| 2 cups | 490g |
| 2 1/2 cups | 612.5g |
| 3 cups | 735g |
Source: USDA FoodData Central (FDC ID: 1088). 1 US cup = 240ml. Values use spooned-and-leveled method.
1/3 Cup of Different Ingredients — Weight Comparison
1/3 cup of different ingredients varies widely in weight because each has a different density. This matters when substituting ingredients in recipes.
| Ingredient | 1/3 Cup (g) |
|---|---|
| Heavy Cream | 79.33g |
| Light Cream (half & half) | 80g |
| Whole Milk | 81.33g |
| Skim Milk (Non-fat) | 81.67g |
| Buttermilkcurrent | 81.67g |
All values use USDA FoodData Central spooned-and-leveled method. Click any ingredient to see its full conversion table.
Measuring Buttermilk Accurately
Why weight matters: 1/3 cup of buttermilk can weigh anywhere from 69g to 98g depending on how you measure it. The USDA standard is 81.67g (spooned and leveled). Scooping directly from the container can add 10–20% extra weight, which affects recipe results — especially in baking.
About buttermilk density: Buttermilk is similar in density to skim milk. 1 cup = 245g. The acidity (pH 4.5) activates baking soda and tenderizes gluten. No buttermilk? Mix 1 cup milk + 1 tablespoon white vinegar/lemon juice, wait 5 minutes.
About 1/3 Cup as a Measurement
1/3 cup = 5 tablespoons + 1 teaspoon = 80ml. This unusual fraction appears in recipes that scale for 2 servings from a 3-serving base. It cannot be made from combining standard 1/4 and 1/8 cup measures without error.
One-third cup is common in yogurt parfait recipes, small-batch granola bars, and single-layer cake recipes scaled for 2 servings. It is exactly 80ml in metric volume.
Frequently Asked Questions
How many grams is 1/3 cup of buttermilk?
1/3 cup of buttermilk weighs 81.67 grams (2.88 oz, 80ml). Based on USDA FoodData Central: 1 cup buttermilk = 245g, so 1/3 cup = 245 × 0.333 = 81.67g.
Is 1/3 cup of buttermilk the same weight every time?
The weight can vary slightly depending on measuring technique. Spooned and leveled gives 81.67g. Scooped (packed) can be 10–20% heavier. Sifted gives a lighter weight. The USDA standard (spooned and leveled) of 81.67g is the most reliable baseline for recipes.
How do I accurately measure 1/3 cup of buttermilk?
For accuracy, use a kitchen scale and weigh 81.67g of buttermilk. If using measuring cups, spoon the buttermilk lightly into a 1/3 Cup measuring cup and level off the top with a straight edge. Avoid scooping directly from the container, which compacts the ingredient and adds extra weight.
How does 1/3 cup of buttermilk compare to other ingredients?
1/3 cup of different ingredients varies significantly: Heavy Cream = 79.33g, Light Cream (half & half) = 80g, Whole Milk = 81.33g. This is because each ingredient has a different density.