Oil to Butter Calculator — Cooking Substitution
Swap oil for butter (or vice versa) in any recipe: enter the amount and unit, choose the direction, and get the exact substitution quantity in cups, tablespoons, teaspoons, and ml.
Conversion direction
Unit
Use this amount of butter instead of the original oil
- 1
Convert to cups
1 × 1 = 1 - 2
Apply oil-to-butter ratio
1 × 1.3333 = 1.3333Oil is 100% fat; butter is ~80% fat — need 4/3 as much butter. - 3
Convert back to cups
1.3333 ÷ 1 = 1.33
How does this calculator work?
Replace butter with ¾ the volume of oil (butter is ~80% fat; oil is 100%). Replace oil with 1⅓ times the volume of butter. Example: a recipe calling for 1 cup butter → use ¾ cup oil; a recipe calling for ½ cup oil → use ⅔ cup butter. The swap works for most quick breads, muffins, and cakes but may affect texture in recipes built around creaming solid butter.
Formula
How this is calculated
The standard culinary conversion between butter and oil is based on fat content: butter is approximately 80% fat (the rest is water and milk solids), while cooking oil is 100% fat. To get the same richness from oil as you would from butter, you need less oil — about ¾ of the butter quantity. Conversely, replacing oil with butter requires more butter to supply the equivalent fat: 1 cup of oil needs 1⅓ cups of butter.
In practice the ratio used by most food authorities (the USDA, Joy of Cooking, and major baking brands) is: 1 cup butter = ¾ cup oil, and 1 cup oil = 1⅓ cups butter. This calculator applies those ratios and converts the result into cups, tablespoons, teaspoons, and millilitres (1 US cup = 236.6 ml, 1 tablespoon = 14.8 ml).
Note that swapping oil for butter (or the reverse) changes more than just fat: butter adds flavour, browning, and a slightly denser crumb; oil keeps baked goods moister for longer because it does not solidify when cooled. The substitution works well for most quick breads, muffins, and cakes, but may alter texture in recipes where the creaming of solid butter with sugar is structurally important (like layer cakes or croissants).
Frequently asked questions
Yes, with caveats. The swap works well for muffins, quick breads, brownies, and most cakes. It works less well for recipes that rely on creaming solid butter with sugar (layer cakes, shortbread) or laminated doughs (croissants, puff pastry), where the solid fat creates layers and lift that oil cannot replicate.
For neutral flavour, use a neutral oil such as sunflower, vegetable, or light rapeseed oil — these do not compete with the recipe's intended flavour. Olive oil adds its own taste, which can complement savoury bakes or rustic cakes but clash with delicate flavours. Coconut oil is solid at room temperature and behaves somewhat more like butter.
Butter is only ~80% fat; the remaining ~20% is water and milk solids. Oil is 100% fat. To match the fat content of 1 cup of oil, you need about 1⅓ cups of butter. If you used equal volumes, your bake would be drier and less rich than intended.
Also known as
TG we-Calculate Editorial Team. (2026). Oil to Butter Calculator — Cooking Substitution [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/oil-to-butter-calculator
TG we-Calculate Editorial Team. "Oil to Butter Calculator — Cooking Substitution." TG we-Calculate. 2026. https://we-calculate.com/calculator/oil-to-butter-calculator.
TG we-Calculate Editorial Team, "Oil to Butter Calculator — Cooking Substitution," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/oil-to-butter-calculator
@misc{wecalculate_oil_to_butter_calculator, title = {Oil to Butter Calculator — Cooking Substitution}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/oil-to-butter-calculator}}, year = {2026}, note = {TG we-Calculate} }
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