Oil to Butter Conversion Calculator
Enter the amount of oil your recipe calls for and this calculator instantly gives you the equivalent butter or margarine, in the same unit or any other kitchen measurement. Switch to butter-to-oil mode for the reverse. Supports vegetable oil, olive oil, and coconut oil, and handles cups, tablespoons, teaspoons, millilitres, grams, ounces, and sticks of butter.
Why the ratio is 3:4, not 1:1
Butter is roughly 80% fat and 20% water, while cooking oil is 100% fat. Because oil is a purer fat, you need less of it than butter to provide the same fat content in a recipe. The standard substitution is 3 parts oil for every 4 parts butter, or about 0.75 cups of oil for every 1 cup of butter. Going the other direction, 1 cup of oil needs 1-1/3 cups (about 4/3) of butter to match it. This ratio is consistent across vegetable, canola, sunflower, and most other liquid cooking oils.
How to use this calculator
Select the conversion direction (oil to butter or butter to oil), choose the oil type, enter the amount from your recipe, and pick the unit (cups, tablespoons, teaspoons, millilitres, grams, ounces, or sticks of butter). The result updates instantly in your chosen unit, and a breakdown panel shows the same amount in every common kitchen measurement so you can use whichever is most convenient. The "show your work" panel traces the exact arithmetic step by step.
Olive oil vs. vegetable oil: does the ratio change?
By volume, the 3:4 ratio applies to all liquid cooking oils including olive oil. A recipe calling for 3/4 cup of vegetable oil can take 3/4 cup of olive oil directly, then you use 1 cup of butter as the alternative. Where olive oil diverges slightly is density: olive oil is about 0.911 g/mL, nearly identical to vegetable oil (about 0.910 g/mL), so weight-based conversions are also essentially the same. The main practical difference is flavour: olive oil adds a fruity, grassy note that suits Mediterranean bakes and vegetable dishes but can be noticeable in delicate cakes. Light or mild olive oil minimises this effect.
Coconut oil substitutions
Coconut oil is solid below about 24 C (76 F), so it behaves more like butter than liquid oils at room temperature. When a recipe calls for solid coconut oil, measure it in the same way you would measure solid butter. When melted, use the same 3:4 volume ratio as any other liquid oil. Because coconut oil is also 100% fat, 1 tablespoon of coconut oil contains slightly more fat than 1 tablespoon of butter but less than a tablespoon of most liquid vegetable oils by weight. For most cooking and baking purposes, a 1:1 substitution of coconut oil for butter by volume is common and produces good results; the 3:4 ratio is the technically precise version.
When this substitution works and when it does not
The oil-for-butter swap works well in quick breads, muffins, cakes, brownies, and most savoury baked goods that already call for melted butter. It also works fine for sauteing and pan frying. The swap is problematic in recipes where the solid state of butter is essential to the technique: flaky pie crusts, croissants, shortbread, and laminated pastries all rely on cold butter forming solid pockets that create layers or a crumbly texture. Using liquid oil in those recipes will produce a greasy, flat result. Similarly, buttercream frosting and most creamed-butter batters depend on butter holding air when beaten, which oil cannot do.
Oil to Butter Conversion Quick Reference
| Oil (volume) | Butter (volume) | Butter (sticks) | Butter (grams, approx.) |
|---|---|---|---|
| 1 tsp | 1-1/3 tsp | 0.03 | 6 g |
| 1 tbsp | 1-1/3 tbsp (4 tsp) | 0.09 | 19 g |
| 2 tbsp | 2-2/3 tbsp | 0.17 | 38 g |
| 1/4 cup | 1/3 cup | 0.25 | 76 g |
| 1/3 cup | 7 tbsp (approx.) | 0.34 | 101 g |
| 1/2 cup | 2/3 cup | 0.50 | 151 g |
| 2/3 cup | 14 tbsp (approx.) | 0.67 | 201 g |
| 3/4 cup | 1 cup | 0.75 | 227 g |
| 1 cup | 1-1/3 cups | 1.00 | 302 g |
| 2 cups | 2-2/3 cups | 2.00 | 605 g |
Volume-based conversions using the standard 3:4 ratio. For weight, multiply oil grams by 1.33 to get butter grams (vegetable oil).
Frequently asked questions
How much butter do I use instead of 1 cup of oil?
Use 1-1/3 cups (about 1.33 cups) of butter for every 1 cup of oil. In grams: 1 cup of vegetable oil is about 218 g, and the equivalent butter is about 227 g (1 stick per 1/2 cup of oil, so 2 sticks for 1 cup of oil). You can also express this as: for every tablespoon of oil, use 1-1/3 tablespoons of butter.
How much oil do I use instead of 1 cup of butter?
Use 3/4 cup (12 tablespoons) of oil for every 1 cup of butter. This works for vegetable oil, canola oil, sunflower oil, and olive oil. The ratio is the same whether you are measuring by volume or by weight (approximately).
Can I substitute oil for melted butter 1:1?
A 1:1 substitution will work in many forgiving recipes and will not ruin most baked goods, but technically you should use 3/4 the amount of oil versus butter. The 1:1 swap adds slightly more fat (since oil is 100% fat versus butter at 80%), which can make muffins or cakes a little greasier or more tender. For best results, use the 3:4 ratio.
Does the oil-to-butter conversion work for olive oil?
Yes. The 3:4 volume ratio is the same for olive oil as for vegetable oil. Use 3/4 cup olive oil for every 1 cup butter. The density of olive oil (about 0.911 g/mL) is nearly identical to other vegetable oils, so weight-based conversions are also the same. The main consideration is flavour: standard or light olive oil is neutral enough for most baking, while extra virgin adds a noticeable taste.
How many sticks of butter equal 1/2 cup of oil?
1/2 cup of oil is equivalent to 2/3 cup of butter, which is about 10.67 tablespoons or roughly 1.33 sticks. In practice, most bakers round this to 1-1/4 or 1-1/3 sticks. One stick of butter equals 1/2 cup (8 tablespoons or 113 g).
What is the butter-to-oil conversion for coconut oil?
By volume, use 3/4 the amount of melted coconut oil versus butter, the same as any other oil. So 1 cup of butter becomes 3/4 cup of melted coconut oil. If your recipe specifies solid coconut oil, it is behaving like butter; in that case many cooks use a 1:1 ratio, though the precise version is still 3:4.
Does substituting oil for butter change the texture?
Yes, usually. Oil-based cakes and muffins tend to be more moist and stay tender longer because liquid fat coats gluten strands more thoroughly. Butter-based baked goods often have a slightly firmer crumb and a richer dairy flavour. In cookies, oil produces chewier, denser results while butter produces crispier edges. The swap also removes the water content of butter, which can make some items slightly denser.