By Zencalcy Editorial TeamLast reviewed About us
Butter is ~80% fat, oil is 100% — so swaps aren't 1:1. Convert either direction with the ratio bakers actually use, plus a liquid adjustment note.
Swap oil and butter in baking without ruining texture.
butter = oil × 1.25 · oil = butter × 0.8
When replacing butter with oil, reduce other liquids slightly; butter brings milk solids and water oil lacks.
| Symbol | Meaning |
|---|---|
| ×1.25 | Compensates for butter's ~80% fat content |
½ cup oil → ½ × 1.25 = ⅝ cup butter (10 tbsp). 1 cup butter → 0.8 cup oil.
Continue with the Air Fryer Calculator, Butter Calculator, or the Cake Pan Converter — or browse more cooking converters tools and all cooking calculators.
Yes — oil cakes stay moister, butter cakes taste richer and hold shape better. Pick for the outcome you want.
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Content updated: September 2026