Ingredient Guide
See all Buttermilk conversions
Open the full ingredient guide for density notes, common cup weights, and the most-used conversion paths.
Buttermilk ingredient guide →1 cup of Buttermilk in ounces
1 cup of buttermilk = 8.6 ounces. That's based on a 245 g per cup baseline. Buttermilk is also called cultured buttermilk in some recipes. Because buttermilk can shift with temperature and texture state, weighing is usually more accurate than measuring by volume.
Answer
8.6 ounces
Based on buttermilk density of 1.03 g/ml
Sources: King Arthur Baking, USDA FoodData Central
Shop scales ↗
Affiliate link. No extra cost to you.
Need a substitute for Buttermilk?
We have 3 tested substitutions with exact ratios.
Find a substitute →How many cups is 8 oz, 16 oz, or 32 oz of buttermilk?
Packages of buttermilk are usually labeled by weight. These are weight ounces converted at 245 g per cup — not fluid ounces.
| Package size | US cups |
|---|---|
| 4 oz | 0.47 cups |
| 8 oz | 0.93 cups |
| 12 oz | 1.4 cups |
| 16 oz | 1.9 cups |
| 24 oz | 2.8 cups |
| 32 oz | 3.7 cups |
Keep going with Buttermilk
Substitute Path
Buttermilk substitutions
Start with Milk + Lemon Juice using 1 cup milk + 1 tbsp lemon juice, let sit 5 minutes, then see the full substitute hub for more tested options.
Open Buttermilk substitutions →Recipe Context
Buttermilk substitute for cakes
Jump straight to the recipe-specific page for ratios and adjustment notes in cakes.
Buttermilk substitute for cakes →Quick Reference Table
| cups | ounces |
|---|---|
| 1/4 cups | 2.1 ounces |
| 1/3 cups | 2.8 ounces |
| 1/2 cups | 4.3 ounces |
| 1 cups | 8.6 ounces |
| 1.50 cups | 12.9 ounces |
| 2 cups | 17.2 ounces |
| 3 cups | 25.8 ounces |
| 4 cups | 34.4 ounces |
Figures use the US cup (236.6 ml).
Custom Amount
Quick Convert
Ingredient-specific, density-based conversions for baking
1 cups of Buttermilk equals 8.6 ounces
Ingredient-specific · density-based
Cup size
Based on us cup (236.6 ml) · density data from baking references and our own measurements.Advertisement
Why this conversion varies
Buttermilk changes behavior based on temperature and fat state.
- Cold, softened, and melted states do not fill cups the same way.
- Air pockets and smearing can alter volume fills.
- This page uses a consistent 245 g per cup baseline for repeatable conversions.
Why this conversion matters
Buttermilk influences richness, tenderness, and structure. Consistent conversion helps maintain stable emulsions and predictable bake results.
Practical baking use
Cultured dairy product with a tangy flavour and thick consistency. Use this conversion as a practical starting point for scaling recipes with buttermilk.
- If consistency matters, verify with a small test batch first.
- Use weight-based measurements when precision is critical.
FAQ
How much is 1 cup of buttermilk in ounces?
1 cup of buttermilk is 8.6 ounces using a 245 g per cup baseline.
Is 8 oz of buttermilk the same as 1 cup?
0.93 cups — 8 oz by weight of buttermilk is not 1 US cup. A cup of buttermilk weighs 245 g (8.6 oz). Ounces on this page are weight, not fluid ounces — the "8 oz = 1 cup" rule only holds for water-like liquids.
Is it better to weigh buttermilk for baking?
Usually yes. Weight-based measuring reduces shifts from temperature and texture state, so your results are more repeatable.
Related links for Buttermilk
Recipe Context for Buttermilk
For laminated dough: temperature and exact fat mass impact layer definition.
For creaming methods: weight keeps butter-to-sugar balance stable.
For custards: tight dairy ratios reduce curdling risk.
Common Pitfalls
- Switching brands without re-checking weight can change texture and bake time.
- Using volume-only measurements for dense ingredients can overshoot recipe targets.
- Butter and dairy temperature affects emulsion stability and spread.
Brand Variance Example
Baseline on this page: 1 cup buttermilk = 245g. Real-world range can shift by about 6% because temperature and fat phase (solid vs softened vs melted) change effective volume.
Example for 2 cups: baseline 490g, common range 460g-520g. If your bake is texture-sensitive, start with the lower bound and adjust after a test batch.
Other conversions for Buttermilk
Advertisement