Sour Milk vs Buttermilk
A side-by-side guide to substituting Buttermilk for Sour Milk (or vice versa).
Buttermilk works as a 1:1 swap for Sour Milk in most recipes.
Side-by-side
Buttermilk
Conversion: 1:1 substitution (use the same amount)
Tags: common
Notes: Buttermilk is tangier and thinner than sour milk but achieves similar acidity for baking and pancakes. This is a reliable 1:1 substitution.
Read the full guide: Buttermilk
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Open calculator →When to use Buttermilk instead of Sour Milk
Buttermilk is tangier and thinner than sour milk but achieves similar acidity for baking and pancakes. This is a reliable 1:1 substitution. The conversion is 1:1 substitution (use the same amount).
Common questions
Yes — Buttermilk is tangier and thinner than sour milk but achieves similar acidity for baking and pancakes. This is a reliable 1:1 substitution. Ratio: 1:1 substitution (use the same amount).
1:1 substitution (use the same amount). For other quantities, use the SubSwap calculator.
They are similar in most uses, but Buttermilk is tangier and thinner than sour milk but achieves similar acidity for baking and pancakes..
Buttermilk is one of the options SubSwap lists for Sour Milk. The 'best' choice depends on your recipe — see the full list of Sour Milk substitutes.
Looking for more Sour Milk substitutes beyond Buttermilk?
See all Sour Milk swaps →