Free Oil to Butter Conversion calculator
Swap butter for oil (or oil for butter) in any baking recipe. Butter is about 80% fat and oil is nearly all fat, so the rule is roughly ¾ cup of oil per 1 cup of butter — by volume or by weight, in cups, tablespoons or grams, updated live, as you type.
On this page16 sections
Conversions for baking guidance only. Creaming, laminated pastry and frosting may not swap cleanly — see the notes below.
Results are estimates. Consult a professional.
How the oil to butter conversion works
You cannot swap butter and oil one for one. Butter is about 80% fat, with the rest water and milk solids; baking oils are close to 100% fat. So a recipe needs less oil than the butter it replaces. The common rule of thumb is three parts oil for four parts butter — about three-quarters of a cup of oil for every cup of butter.
This oil to butter conversion calculator runs that math both ways and in three units. Pick a direction — butter to oil, or oil to butter — then choose to substitute by volume or by weight, and it returns the amount in cups, tablespoons and grams, updated live as you type.
A worked oil to butter conversion example
Priya wants to bake a quick olive-oil cake but the recipe is written for 1 cup of butter. She is mixing the batter by hand, no creaming, so oil will work. She needs to know how much oil to pour in.
Step 1 — Convert by volume (the ¾ rule)
By volume, oil = butter × 0.75. So 1 cup × 0.75 = 0.75 cup of oil. In tablespoons that is 0.75 × 16 = 12 tbsp; in grams, 0.75 cup × 200 g per cup = 150 g.
Step 2 — Check it by weight
If Priya bakes with a scale, the weight method is tighter. One cup of butter weighs 227 g, and oil = butter × 0.80, so 227 × 0.80 = 181.6 g of oil — about 0.91 cup. The two methods differ a little, which is normal; see the section below on which to trust.
Step 3 — Read it off in your unit
Priya is using cups, so she pours ¾ cup of oil in place of the cup of butter. Had the recipe said 1 stick (½ cup) of butter, the same rule gives 6 tablespoons of oil.
Oil to butter conversion chart
This chart applies the 3:4 volume rule to the amounts recipes use most. Read left to right to swap butter for oil; read right to left to swap oil for butter. Grams use 227 g per cup of butter and 200 g per cup of oil.
| Butter | Oil (by volume) | Oil in tbsp | Oil in grams |
|---|---|---|---|
| 1 tsp | ¾ tsp | 0.25 tbsp | 3.1 g |
| 1 tbsp | ¾ tbsp | 0.75 tbsp | 9.4 g |
| ¼ cup (½ stick) | 3 tbsp | 3 tbsp | 37.5 g |
| ½ cup (1 stick) | 6 tbsp | 6 tbsp | 75 g |
| ¾ cup | 9 tbsp | 9 tbsp | 112.5 g |
| 1 cup (2 sticks) | ¾ cup | 12 tbsp | 150 g |
| 1½ cups | 1⅛ cups | 18 tbsp | 225 g |
| 2 cups (4 sticks) | 1½ cups | 24 tbsp | 300 g |
All figures use the by-volume 3:4 rule (oil = butter × 0.75). 1 US stick of butter = ½ cup = 8 tbsp. Switch the calculator to "by weight" for a scale-based swap.
How much oil for 1 cup or 1 stick of butter?
These are the two questions cooks ask most mid-recipe, so here they are answered directly.
- 1 cup of butter → ¾ cup of oil (12 tbsp, or 150 g).
- 1 stick (½ cup) of butter → 6 tbsp of oil (about 75 g).
- ½ stick (¼ cup) of butter → 3 tbsp of oil (about 37.5 g).
- The other way, ½ cup of oil → about ⅔ cup of butter.
If your recipe is in grams, switch the calculator to weight: 1 cup of butter weighs 227 g and converts to 181.6 g of oil. For the reverse trip and other ingredients, the butter converter handles sticks, cups, tablespoons and grams.
By volume vs by weight: which conversion to use
The two methods give slightly different answers, and that trips people up. By volume the swap is 0.75; by weight it is 0.80. Neither is wrong — they measure butter's fat content from different angles.
Use the volume method (0.75) for everyday baking
If you measure in cups and tablespoons, the 3:4 rule is the practical choice. It is the figure nearly every recipe and conversion chart uses, and it is close enough for cakes, muffins, quick breads and brownies. Three-quarters of a cup of oil per cup of butter, and you are done.
Use the weight method (0.80) when you bake with a scale
Weighing is the more precise way to bake, and by weight oil is 80% of the butter, because butter is roughly 80% fat. For 200 g of butter, use 160 g of oil. The weight swap also sidesteps the small density gap between butter and oil that the volume rule glosses over.
When you can't swap butter for oil
Most charts stop at the ratio and leave out the part that ruins bakes: butter does jobs oil simply cannot. Where a recipe leans on solid fat, no conversion factor saves it. Three cases matter.
Creaming — when air is the point
Creaming beats softened butter with sugar until it is pale and fluffy, and the sugar crystals cut tiny air pockets into the solid fat. Those pockets are what make a butter cake or a classic cookie rise and turn tender. Oil is liquid, so it cannot trap air this way. Swap oil into a creamed recipe and you get a flatter, denser, more cake-like result.
Laminated pastry — when butter is the structure
Croissants, puff pastry and flaky pie crust depend on cold, solid sheets of butter that steam apart into layers in the oven. Oil stays liquid and coats the flour evenly, so it produces a short, crumbly texture with no flake at all. Here butter is not flavour, it is architecture, and oil cannot stand in.
Frosting and anything that sets firm
Buttercream, shortbread and frostings hold their shape because butter is firm at room temperature. Oil never sets, so an oil frosting slumps and an oil shortbread spreads into a greasy puddle. The reliable swap is oil into batters that are already pourable. For temperature-sensitive bakes, our oven temperature converter helps you dial the heat in too.
Which oil to use in place of butter
The conversion ratio is the same for any liquid oil, but flavour is not. The oil you choose either disappears into the bake or becomes part of it.
| Oil | Flavour | Best for |
|---|---|---|
| Vegetable / canola | Neutral | When you want no oil taste — most cakes, muffins, brownies |
| Light olive oil | Mild, clean | Everyday baking where you want oil's moisture, not its flavour |
| Extra-virgin olive oil | Fruity, peppery | Olive-oil cakes, citrus and chocolate bakes that can carry it |
| Melted coconut oil | Faint coconut | A near-butter swap; see the 1:1 note below |
| Avocado oil | Very mild | A high-heat, neutral alternative to vegetable oil |
A good rule from olive-oil bakers: only bake with an oil you would happily eat on a salad. For chocolate or citrus, a medium or robust extra-virgin oil stands up; for delicate crumbs, choose a milder one.
Oil-selection guidance follows California Olive Ranch's recipe-makeover advice on swapping olive oil for butter, and the principle that good olive oil adds flavour and keeps baked goods moist.Adjusting liquid and texture after the swap
Removing butter removes its water, and that small change shows up in the dough. A couple of easy adjustments close the gap.
- Add a little liquid to dry doughs. Butter is about 20% water; oil is none. For drier batters and doughs, add 1–2 tablespoons of milk or water per cup of butter you replaced.
- Expect a moister, denser crumb. Oil coats flour proteins more thoroughly, so the bake stays soft for longer but rises a touch less. This is a feature in snacking cakes and muffins.
- Don't over-mix. Without creaming, you only need to combine until smooth; beating an oil batter hard does nothing useful and can toughen it.
- Mind the browning. Butter's milk solids brown and add flavour. Oil does not, so an oil bake can look paler — a minute or two longer, or a slightly hotter oven, helps.
For swaps beyond fat — flour, sugar, liquids by volume or weight — reach for the cooking converter, which bridges cups and grams for any ingredient.
Coconut oil and the 1:1 exception
Coconut oil breaks the rule. It is solid at room temperature, so it behaves more like butter than like liquid oil — and it can be creamed and can set firm. For coconut oil, swap one for one with butter rather than using the ¾ factor.
Two cautions. Coconut oil carries a faint coconut flavour, mild in refined oil and stronger in virgin, so it suits some bakes more than others. And it is high in saturated fat, so it is not the heart-healthier swap that liquid oils are.
Mayo Clinic notes that liquid plant oils such as olive and canola carry healthier unsaturated fats than butter's saturated fat, and recommends baking with oil where the recipe allows.Oil to butter conversion definitions
How accurate is this oil to butter calculator?
The arithmetic is exact. By volume it applies 0.75 and by weight 0.80, using 227 g per cup of butter and 200 g per cup of oil from the King Arthur weight chart. Enter your amount and the cups, tablespoons and grams are right to the decimal.
What the calculator can't judge is whether oil belongs in your recipe at all. The ratio is reliable for pourable batters — cakes, muffins, quick breads, brownies. It cannot rescue a creamed cookie, a laminated pastry or a frosting, where butter's solid structure does the work. Treat the numbers as an exact fat swap, and the technique notes above as the guard rails on when to use it.
Frequently asked questions about the free Oil to Butter Conversion calculator
About this Oil to Butter Conversion calculator
This oil to butter conversion calculator runs entirely in your browser. Nothing you type is sent anywhere — enter a butter or oil amount, pick a direction and a method, and the cups, tablespoons and grams update instantly on your device.
It is part of our cooking and baking calculators, alongside the full library of free calculators for everyday measuring, money and home projects.