Buttermilk Substitute Calculator
Enter the cups of buttermilk needed to get the milk and acid amounts for the substitute.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
This calculator scales the classic DIY buttermilk substitute: for every cup of milk, stir in 1 tablespoon of an acid — lemon juice or white vinegar — and let it sit for about 5–10 minutes until it curdles slightly and thickens. The acid lowers the milk's pH and causes the proteins to clump, mimicking the tang and texture of real cultured buttermilk.
Home bakers reach for this substitute constantly, since buttermilk is called for in pancakes, biscuits, cornbread and cakes but is rarely kept on hand; the acid reaction also activates baking soda the same way real buttermilk does, so the substitute works as a near drop-in replacement in most recipes.
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