Butter to Oil Conversion for Baking (2026 Ratio Guide)

To convert butter to oil in baking, scale the butter down by 0.80 by weight — because oil is lighter than butter, that works out to about 13 tablespoons (a scant 3/4 cup plus 1 tablespoon) of oil per 1 cup of butter, or roughly 6 1/2 tablespoons per stick. Butter is about 80% fat with 15–20% water, while oil is 100% fat, so you need less oil to deliver the same fat to the dough. Run your exact amount through our Butter to Oil Converter and it returns cups, tablespoons, and grams in one click.

The mistake I see most often in our recipe-tool feedback is a 1:1 swap. A reader pours a full cup of oil where the recipe called for a cup of butter, then wonders why the cake came out greasy and dense. That extra fat is the whole problem. I made the same error years ago subbing oil into a pound cake — one cup for one cup — and ended up with a heavy, oil-slick loaf that never set a proper crumb. The fix was always arithmetic, not a better recipe: scale the butter to 80% of its weight in oil and the texture lands right.

This guide is the conversion reference, not a general baking how-to. It gives you the oil-for-butter amount at every common measure, explains why the 0.80 ratio works, and shows the calorie and saturated-fat math so you know exactly what the swap changes. For the broader picture on what home bakers actually measure, see our home baking usage-data report.

The 0.80 Butter to Oil Ratio: What It Means and Why It Works

The ratio is a fraction of the butter's weight: take the butter's mass in grams, multiply by 0.80, and that is your oil. The formula is one line:

Oil weight = Butter weight × 0.80

So 1 cup of butter (227 g) becomes 227 × 0.80 = 182 g of oil. One stick of butter (113.5 g, 1/2 cup) becomes 113.5 × 0.80 = 91 g. The Butter to Oil Converter runs this same equation and converts the result to cups and tablespoons for recipes that measure by volume.

The 0.80 figure comes straight from the composition difference. Butter is roughly 80% butterfat, with the remaining 15–20% being water plus a few percent milk solids. Oil is essentially 100% fat. To match the fat that butter contributes, you scale down by the fat fraction — 80% — and that ratio applies cleanly to weight. By volume the number shifts a little because oil is about 9% less dense than butter, so 182 g of oil is closer to 13 tablespoons (a scant 3/4 cup plus 1 tablespoon) rather than a flat 3/4 cup. The chart below gives both the weight and the rounded volume so you never have to do the math at the counter.

Butter to Oil Conversion Chart

Each oil-weight column is butter grams × 0.80; the volume column converts that oil weight to tablespoons (oil weighs about 0.92 g/mL, and 1 tablespoon holds 14.79 mL). The half-cup row is the one most recipes hit, and roughly 6 2/3 tablespoons of oil per stick is the number worth remembering. According to The Southern Lady Cooks butter-to-oil chart, an 80%-fat swap is the standard bakers reach for, and it lines up with the calculator above.

Reverse: Oil to Butter Conversion

To go the other way — replacing oil with butter — you divide the oil's weight by 0.80 (the same as multiplying by 1.25). The formula is:

Butter weight = Oil weight ÷ 0.80

So 1/2 cup of oil (about 109 g) becomes 109 ÷ 0.80 ≈ 136 g of butter, which the converter reports as about 0.6 cup (roughly 9 1/2 tablespoons). You always end up with more butter by weight than the oil you started with, because butter is part water — you need extra to make up the fat. This matters when you find an oil-based recipe but only have butter in the fridge.

Notice the symmetry: 1 cup of oil needs about 1.2 cups of butter, the exact inverse of scaling butter down by 0.80. Reading the forward chart backwards is the quickest way to sanity-check any conversion you do by hand.

Which Baked Goods Work Best with Oil vs. Butter

Oil produces a moister, more tender crumb because it coats flour proteins more thoroughly than solid butter, which limits gluten development. That makes some recipes better with oil and others strictly butter-only. Knowing the difference is what separates a successful swap from a ruined batch.

Cakes and quick breads are the best candidates for oil. Many bakeries use oil in layer cakes on purpose — it keeps the crumb soft for 2–3 days longer than butter does. Muffins and banana bread improve the same way. The Recipe Converter is handy here when you also need to scale the batch up or down after swapping the fat.

Cookies change character with oil. Without solid fat to hold structure during the first minutes of baking, cookies spread more, turn flatter, and bake up chewier. If you want crisp edges and a domed center, keep the butter. For brownies, oil is often the traditional choice anyway — size and pan-depth matter more there, which the Brownie Calculator handles.

Never substitute oil in laminated or flaky pastry. Pie crust, puff pastry, and croissants depend on solid butter melting in distinct layers, with the water content flashing to steam to create lift. Oil saturates the flour evenly and gives you a dense, greasy result instead of flaky layers. Frostings need butter too — for buttercream amounts and structure, use the Buttercream Calculator, because oil makes frosting runny.

Calorie and Fat Comparison: Butter vs. Oil

Per tablespoon, butter is actually lower in calories than most oils, but because you use less total fat by weight, the swap comes out roughly calorie-neutral rather than a big calorie cut. Per the USDA FoodData Central entry for salted butter (FDC 173410), one tablespoon of butter (14.2 g) has about 102 calories, 11.5 g of fat, 7.2 g of saturated fat, and 31 mg of cholesterol. Canola oil runs about 124 calories and 14 g of fat per tablespoon, with roughly 1.0 g saturated. Where oil truly wins is saturated fat, not calories.

Here is the worked example for a full cup of butter swapped to canola oil, using the converter's gram-based engine (butter ≈ 7.17 cal/g, oil ≈ 8.84 cal/g):

• Butter: 1 cup = 227 g × 7.17 cal = 1,628 calories
• Oil: 0.80 × 227 g = 182 g × 8.84 cal = 1,605 calories
• Savings: 1,628 − 1,605 = about 23 calories per batch (calorie-neutral in practice)

The real story is saturated fat, not calories. Butter carries about 7.2 g of saturated fat per tablespoon (roughly 0.51 g per gram of butter); canola has roughly 1.0 g per tablespoon (about 0.07 g per gram). A cup of butter (227 g) holds about 115 g of saturated fat, while the 182 g of canola oil that replaces it holds only about 13 g — a cut of nearly 90% across the whole recipe. The American Heart Association's saturated-fat guidance recommends keeping saturated fat under 6% of total calories — about 13 g a day on a 2,000-calorie diet — and favoring non-tropical plant oils like canola and olive over saturated fats.

Per-tablespoon figures for the oils are typical nutrition-database values for refined cooking oils and vary by brand. Coconut oil is the exception worth flagging: at about 11.2 g of saturated fat per tablespoon, it is nearly as saturated as butter, so swapping for "health" reasons does not hold up. Its advantage is texture, not nutrition — more on that below.

Which Oil Is Best for Baking as a Butter Substitute

Neutral-flavored oils win for most baking because they do not alter the recipe's taste. Canola and vegetable oil are nearly interchangeable and the best all-purpose choices. The right pick depends on flavor, texture, and budget.

• Canola oil — neutral flavor, high smoke point, 124 cal/tbsp. The default butter sub for cakes, muffins, and quick breads.
• Vegetable oil — almost identical to canola in baking results; use whichever you have.
• Refined coconut oil — solid at room temperature (below 76°F), so it is the closest textural match to butter. Works in cookies and even some pie applications where liquid oils fail. Mild, slightly sweet flavor.
• Light or extra-light olive oil — very mild taste, good in muffins and breads. Do not use extra-virgin for baking; its strong flavor and lower smoke point fight sweet recipes. Check the Smoke Point Calculator before high-heat use.
• Avocado oil — neutral, high smoke point, healthy fats, but premium-priced at around $0.50/tbsp versus about $0.08/tbsp for canola.

How to Use the Butter to Oil Converter

The calculator handles both directions, five oil types, and four measurement units, so you do not have to round by hand. Here is the workflow.

1. Choose the direction — butter-to-oil (×0.80 by weight) or oil-to-butter (÷0.80). Pick based on what your recipe calls for versus what you have.
2. Enter the amount and unit — cups, tablespoons, sticks (butter), or grams. It converts between all of them automatically.
3. Select the oil type — canola, vegetable, olive, coconut, or avocado — to see the flavor note and the right nutrition numbers.
4. Read the result — equivalent amount in multiple units plus a side-by-side calorie comparison so you can judge the nutritional trade-off.

For scaling the whole recipe to a different yield after the swap, pair it with the Recipe Converter; for portion planning on a finished cake, the Cake Serving Calculator finishes the job.

Frequently Asked Questions

How much oil do I use to replace butter in baking?

Scale the butter down to 80% of its weight in oil: 227 g of butter (1 cup) becomes about 182 g of oil. By volume that lands near 13 tablespoons — a scant 3/4 cup plus 1 tablespoon — and about 6 2/3 tablespoons replace one stick. The 0.80 factor works because butter is only about 80% fat while oil is 100% fat.

What is the butter to oil ratio for cakes?

The ratio is the same 0.80 by weight for cakes as for any baked good — roughly a scant 3/4 cup plus 1 tablespoon of oil per 1 cup of butter. Cakes are actually the best candidate for the swap, since oil produces a moister, more tender crumb that stays fresh 2–3 days longer than butter-based versions.

Can I substitute oil for butter 1 to 1?

No — a 1:1 swap adds too much fat and makes baked goods greasy and dense. A full cup of oil is about 217 g of pure fat, versus the roughly 182 g of fat (the rest being water) in a cup of butter. Always scale the oil down to about 80% of the butter's weight, which is roughly a scant 3/4 cup plus 1 tablespoon of oil per cup of butter.

Which oil is best to replace butter in baking?

Canola or vegetable oil is best for most recipes because they are neutral and do not change the flavor. Refined coconut oil is the best textural match since it is solid at room temperature like butter, while light olive oil suits muffins and breads.

Does replacing butter with oil change the calories?

Barely. Swapping 1 cup of butter (about 1,628 calories) for the 182 g of canola oil that replaces it (about 1,605 calories) saves only around 23 calories — essentially calorie-neutral. The real benefit is saturated fat, which drops nearly 90%, from about 115 g to about 13 g across the recipe.

Can I use oil instead of butter in cookies and pie crust?

You can use oil in cookies, but expect flatter, chewier results with less lift. Never use oil in pie crust, puff pastry, or croissants — those depend on solid butter melting in layers and turning its water to steam for flakiness, which oil cannot do.

How do I convert oil back to butter?

Divide the oil's weight by 0.80 (or multiply by 1.25). So 1/2 cup of oil (about 109 g) becomes about 136 g of butter, which the converter reports as roughly 0.6 cup (about 9 1/2 tablespoons). You always need more butter by weight than oil, because part of butter's weight is water, not fat.

Related Articles

• Home Baking Calculator Usage Data 2026 — What home bakers actually measure across thousands of sessions, including fat and flour ratios.
• Pizza Dough Calculator Guide — Hydration and oil ratios for the perfect dough, another place fat content matters.
• Catering: Calculating Food Per Person — Scaling recipes and portions for larger crowds.

Related Calculators

• Butter to Oil Converter — Convert butter to oil or oil to butter in cups, tablespoons, and grams with calorie comparison.
• Recipe Converter — Scale any recipe's ingredients up or down for any serving count.
• Smoke Point Calculator — Find the smoke point and best uses for cooking oils before high-heat baking.
• Buttercream Calculator — Calculate exact buttercream amounts (where butter, not oil, is essential).
• Cake Serving Calculator — Find how many servings your cake yields by shape and size.

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This article provides general information for educational purposes. Butter nutrition figures come from USDA FoodData Central (FDC 173410); oil figures are typical nutrition-database values for refined cooking oils and may vary by brand. Consult a registered dietitian for personalized dietary guidance.