Substitute Oil for Butter in Baking: Ratios & Tips

To substitute oil for butter in baking, use about three-quarters as much oil as butter by volume; oil adds fat but does not provide butter’s water, milk solids, or ability to trap air when creamed. This simple 12-muffin recipe shows the swap in a moist quick bread, while the guide explains how to adjust the ratio for other bakes.

Ingredients

2 cups (250 g) all-purpose flour
1/2 cup (100 g) granulated sugar
2 teaspoons (8 g) baking powder
1/2 teaspoon (3 g) fine salt
1 large egg (about 50 g without shell), at room temperature
5/8 cup (150 ml) milk, at room temperature
6 tablespoons (90 ml) neutral oil, such as canola, sunflower, or vegetable oil
1 teaspoon (5 ml) vanilla extract

The oil amount replaces 1/2 cup (113 g) butter using the three-quarter rule. The milk quantity includes about 2 tablespoons (30 ml) extra liquid to make up for some of the water that butter would have contributed. If you use a different milk or a dairy-free alternative, choose an unsweetened version so the muffins do not become unexpectedly sweet.

Instructions

Heat the oven to 375°F (190°C). Line a standard 12-cup muffin pan with paper liners, or lightly grease the cups. Set out the egg and milk while you measure the dry ingredients; room-temperature ingredients mix together more evenly.
Whisk the flour, sugar, baking powder, and salt in a large bowl until the baking powder is distributed throughout. In a second bowl, whisk the egg, milk, oil, and vanilla until blended. The oil may look like a separate sheen at first; whisk until the mixture is as uniform as you can make it.
Pour the wet mixture into the dry ingredients. Fold gently with a spatula just until no large pockets of dry flour remain. A few small lumps are fine. Do not beat the batter smooth: overmixing develops gluten and can make the muffins dense or tough.
Divide the batter evenly among the 12 muffin cups, filling each about two-thirds to three-quarters full. Bake for about 20 minutes, rotating the pan once if your oven browns unevenly. The tops should be lightly golden and spring back when touched. Check a muffin in the center of the pan with a food thermometer: the center must reach at least 160°F (71°C), the USDA FSIS safe minimum temperature for egg dishes.
Let the muffins sit in the pan for 5 minutes, then move them to a rack to finish cooling. This brief rest helps them release cleanly without continuing to steam in the hot pan. Serve warm or cool completely before storing.

Tips

Use the three-quarter rule as a starting point. For each 1 cup (227 g) butter in a recipe, try 3/4 cup (180 ml) oil. For 1/2 cup (113 g) butter, use 6 tablespoons (90 ml) oil; for 1/4 cup (57 g) butter, use 3 tablespoons (45 ml). This ratio replaces the fat without making the finished bake as greasy as a full-volume oil swap can. Butter brands vary slightly in water content, and recipes vary in their other liquids, so treat the ratio as a reliable starting point rather than a guarantee of identical results.
Consider the missing water, but do not add it automatically. Butter is roughly 80% fat, with most of the remainder being water and a little milk solids. If a recipe has room for more liquid, add about 1 to 2 tablespoons (15 to 30 ml) milk or water per 1/2 cup (113 g) butter being replaced. This muffin formula includes 2 tablespoons extra milk. If the recipe already has plenty of liquid, or the batter seems loose, skip the addition rather than thinning it.
Choose oil for its flavor and state. Canola, sunflower, and ordinary vegetable oils have mild flavors and work in most cakes, muffins, and quick breads. Light olive oil can work too, though it may leave a noticeable olive flavor; extra-virgin olive oil is best where that flavor suits the bake. Coconut oil is solid in a cool room and can behave more like softened butter, but it will add coconut notes and may firm up the crumb as it cools.
Do not expect oil to cream like butter. Creaming softened butter with sugar traps tiny air bubbles that help some cakes and cookies rise. Oil is liquid and cannot hold that structure in the same way. For this recipe, mixing the wet ingredients separately works well. For a cake recipe that relies on creaming, use a recipe written for oil or expect a closer, less fluffy crumb rather than trying to beat oil and sugar until airy.

Serving Suggestions

Serve these muffins warm for breakfast or a snack, plain or with a little jam, honey, or softened butter. Their mild flavor also works alongside yogurt and fresh fruit, or as a simple accompaniment to soup. If you are serving them for a gathering, let them cool enough that the paper liners peel away neatly, then arrange them in a single layer so their tender tops are not crushed.

For a more polished finish, dust cooled muffins lightly with powdered sugar, or split one and toast the cut sides briefly. Oil-based muffins tend to stay tender as they cool, so they are also convenient to pack once completely cooled. Avoid closing warm muffins in a container: trapped steam can make their tops damp and sticky.

Variations

Add fruit: Fold 1 cup (150 g) blueberries, raspberries, or small diced apple into the finished batter. Pat juicy fruit dry first, and fold just enough to distribute it without crushing berries. Frozen blueberries can go in straight from the freezer; the muffins may need an extra minute or two in the oven.

Add spice or citrus: Whisk 1 teaspoon (2 g) ground cinnamon into the dry ingredients, or add 1 tablespoon (6 g) finely grated lemon or orange zest to the sugar. Zest gives a clear citrus aroma without changing the amount of liquid in the batter.

Use a different mild oil: Avocado oil can replace the neutral oil in the same quantity, though its price and subtle flavor may make it less useful for everyday baking. Avoid strongly flavored oils unless you want their taste to be part of the result. For a dairy-free batch, use an unsweetened oat or soy drink instead of milk; the texture may be slightly different, but the oil swap remains the same.

Adapt the idea to other bakes: Oil swaps are usually easiest in muffins, quick breads, snack cakes, and many brownies because those batters already use liquid fat or do not depend heavily on creaming. They are less predictable in laminated pastry, pie crust, biscuits, and many traditional cookies, where cool solid butter creates distinct layers, flakes, or a particular spread. For those, a recipe specifically developed with oil or another solid fat is a better choice.

Storage and Reheating

Cool the muffins completely, then refrigerate them in an airtight container within 2 hours of baking. They keep for 3 to 4 days in the refrigerator; separate layers with parchment if stacking so the tops do not stick together. Refrigeration can make the crumb feel firmer, which is normal for baked goods containing oil and milk.

For longer storage, freeze the cooled muffins in a freezer-safe bag or container for up to 2 to 3 months. Thaw in the refrigerator or at room temperature, then warm a muffin in a 300°F (150°C) oven for about 5 to 8 minutes. For a quick serving, microwave one for 10 to 15 seconds; longer heating can make it rubbery. Reheat only the portion you plan to eat, and return any remaining muffins to the refrigerator within 2 hours.

Frequently Asked Questions

What is the correct oil-to-butter ratio in baking?

A useful starting point is 3/4 cup (180 ml) oil for every 1 cup (227 g) butter. That reduces the added fat to account for butter’s water and milk solids. For example, replace 1/2 cup (113 g) butter with 6 tablespoons (90 ml) oil. If the recipe can handle extra liquid, add roughly 1 to 2 tablespoons (15 to 30 ml) milk or water for that half-cup of butter being replaced.

Can I replace melted butter with oil one-for-one?

You can sometimes use the same volume in a forgiving recipe, but a full one-for-one oil swap often makes the result heavier or greasier. Start with three-quarters as much oil, especially in muffins, cakes, and brownies, and check whether the batter needs a small amount of extra liquid. When the original recipe specifically calls for melted butter, the texture is more likely to tolerate oil than a recipe that calls for butter creamed with sugar.

Will oil make cakes and muffins moist?

Oil stays liquid at room temperature, so oil-based cakes and muffins often feel tender and moist after cooling. That does not mean every recipe will improve: using too much oil can make the crumb heavy, while removing butter’s water can make a batter too thick. Follow the ratio, account for the other liquids, and avoid overmixing for a balanced texture.

Can I use oil instead of butter in cookies?

Sometimes, but the result can spread more and lose the crisp edges or chewy structure you expect from a butter cookie. Butter can be creamed to hold air and is solid at room temperature; oil cannot do either in the same way. Choose a cookie recipe designed for oil when possible. If adapting an existing recipe, test a small batch first and chill the dough only if the recipe’s texture allows it.

Which oil is best for replacing butter?

Neutral oils such as canola, sunflower, and vegetable oil are versatile because they do not compete with vanilla, fruit, cocoa, or spice. Light olive oil is another option, but its flavor can show through. Coconut oil can work when a recipe benefits from a fat that firms as it cools, though it has a distinct taste and does not behave exactly like butter.

Should I change the baking temperature when I use oil?

Usually, keep the recipe’s stated oven temperature and begin checking at the same time. Oil alone does not require a different temperature, but the changed batter may brown or set somewhat differently. Use visual and texture cues as well as the recipe’s timing, and check the center with a food thermometer when baking an egg-containing dish. For this muffin recipe, the center should reach at least 160°F (71°C).

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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