Because butter contains water and milk solids, you need less oil than butter. Oil makes cakes moister but less fluffy; butter gives flavour and structure. Swapping works best in quick breads, muffins and brownies.
How to use the Oil to Butter Conversion Calculator
- Convert
- Amount
Results update as you type, and every field accepts the units shown in its menu.
How it works
Choose the direction, enter the amount and its unit.
Inputs explained
| Field | What to enter |
|---|---|
| Convert | Choose one: Oil → butter, Butter → oil, Butter → coconut oil |
| Amount | Units: cups, ml, tbsp, tsp, fl oz, L |
Example values
How the main result changes when Amount changes and everything else stays at the example values above:
| Amount (cups) | Result (cups) |
|---|---|
| 0.375 | 0.5 |
| 0.5625 | 0.75 |
| 0.75 | 1 |
| 0.9375 | 1.25 |
| 1.13 | 1.5 |
| 1.5 | 2 |
Formula
Butter = oil × 4 ÷ 3; oil = butter × 3 ÷ 4
Butter is about 80% fat and 16–18% water
Coconut oil = butter × 0.8 by weight (× 0.75 by volume)
Worked example
Inputs — Convert: Oil → butter; Amount: 0.75 cups.
Results — Result = 1 cups; Result by weight = 226.9 g; Result ingredient = Butter.
Frequently asked questions
How much oil replaces 1 cup of butter?
¾ cup of oil.
How much butter replaces ½ cup of oil?
About ⅔ cup (10⅔ tbsp) of butter.
Can I replace butter with coconut oil?
Yes – about 80% of the butter's weight, or ¾ of its volume.