Butter to Oil Substitution Calculator
Swap butter for oil (or oil for butter) in baking with the right ratio — about three-quarters as much oil as butter — and see the amount in cups and tablespoons.
How it works
Oil = butter × 0.75 · Butter = oil × 1.25 (by volume)
Butter is roughly 80% fat and 16% water, while oil is 100% fat, so a straight one-to-one swap adds too much fat and too little moisture. Using about three-quarters as much oil as the butter called for keeps the total fat close to the original. Oil produces a moister, denser crumb and cannot be creamed for air, so it suits quick breads, muffins and brownies better than cakes and cookies that rely on creamed butter for lift.
Worked example
A recipe calls for 1 cup of butter. Multiply by 0.75 to get 0.75 cup of oil — that is 12 tablespoons. Going the other way, 1 cup of oil replaces with 1 × 1.25 = 1.25 cups (20 tablespoons) of butter.
Frequently asked questions
Why not use the same amount of oil as butter?
Butter is about 80% fat and 16% water, so cup-for-cup it delivers less fat than pure oil. Using roughly three-quarters as much oil matches the fat content; a 1:1 swap makes baked goods greasy and can throw off the moisture balance.
Which recipes work best with oil instead of butter?
Oil shines in quick breads, muffins, brownies and carrot or chocolate cakes, where a moist, tender crumb is the goal. It struggles in recipes that depend on creaming butter and sugar for structure and lift, such as buttercream, shortbread and many layer cakes.
Does the type of oil matter?
Use a neutral oil (canola, vegetable, light olive, sunflower) so it does not flavor the bake. Melted butter can substitute for oil at a 1:1.25 ratio when you want a buttery taste but do not need to cream it.
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This calculator is for educational purposes. Double-check important results before acting on them.