Oil to Butter Calculator
Result
Butter
- Sticks
- 2.37
- Cups
- 1.183
- Tablespoons
- 18.9
- Oil
- 217.7 g
Swapping oil for butter takes about 23% more butter by weight, and this oil to butter calculator works that amount out. Vegetable oil is essentially pure fat; butter is only about 81% fat and 16% water. Matching the fat therefore means matching neither the weight nor the volume — a cup of oil becomes rather more than a cup of butter. Enter the oil a recipe asks for in cups, tablespoons, teaspoons, millilitres, grams or ounces, and read the butter in grams, sticks, cups and tablespoons. The two reference tables below cover both directions.
Oil to butter: how much butter for a given amount of oil
| Oil (cups) | Oil (g) | Butter (cups) | Butter (g) | Butter (sticks) |
|---|---|---|---|---|
| 0.25 | 54.4 | 0.296 | 67.1 | 0.59 |
| 0.5 | 108.8 | 0.592 | 134.2 | 1.18 |
| 0.75 | 163.2 | 0.887 | 201.3 | 1.77 |
| 1 | 217.7 | 1.183 | 268.4 | 2.37 |
| 1.5 | 326.5 | 1.775 | 402.5 | 3.55 |
| 2 | 435.3 | 2.366 | 536.7 | 4.73 |
Fat-equivalent amounts. Every row assumes oil at 0.92 g per mL and butter at 81.11% fat, so the butter column is always the oil weight divided by 0.8111.
Butter to oil: how much oil for a given amount of butter
| Butter (sticks) | Butter (g) | Oil (cups) | Oil (g) |
|---|---|---|---|
| 0.25 | 28.3 | 0.106 | 23 |
| 0.5 | 56.7 | 0.211 | 46 |
| 1 | 113.4 | 0.423 | 92 |
| 2 | 226.8 | 0.845 | 184 |
| 4 | 453.6 | 1.69 | 367.9 |
The same relation read backwards — multiply the butter weight by 0.8111 and divide by the weight of a cup of oil. Four sticks is one US pound of butter.
Formula
Butter (g) = Oil (g) ÷ 0.8111 · Oil (g) = Butter (g) × 0.8111
- oil
- The oil the recipe asks for, in grams
- butter
- The butter you need, in grams
- 1
- The fat fraction of vegetable oil — oil is essentially all fat
- 0.8111
- The fat fraction of butter; dividing the oil by it gives the fat equivalent in butter
- ρ
- Oil density, 0.92 grams per millilitre, used to turn cups or millilitres into grams
Use it when a recipe calls for oil and you would rather bake with butter, or the reverse: substitute butter for oil by weight, never by volume. The dough loses the 16% water that butter carries, which changes the texture of pastry and cookies even when the fat matches exactly.
Worked examples
A recipe asks for 1 cup of oil
- A US cup is 236.588 mL, and oil is 0.92 g per mL: 236.588 × 0.92 = 217.7 g of oil
- Oil is pure fat, so 217.7 g of oil is 217.7 g of fat
- Butter is 81.11% fat, so the same fat takes 217.7 ÷ 0.8111 = 268.4 g of butter
- In the units a US kitchen uses: 2.37 sticks, or 1.183 cups, or 18.9 tablespoons
More butter than oil, and more by volume too — 1.18 cups against 1 cup, because butter is also less dense than oil. This is the step most substitutions get wrong by swapping cup for cup.
250 mL of oil from a metric recipe
- 250 mL × 0.92 g per mL = 230 g of oil
- 230 ÷ 0.8111 = 283.6 g of butter
- 283.6 ÷ 113.398 = 2.5 sticks, and 283.6 ÷ 226.796 = 1.25 cups
- 283.6 ÷ 14.175 = 20 tablespoons
A tidy result by accident: 250 mL of oil lands on exactly two and a half sticks. Treat that as a coincidence of the numbers rather than a rule — 200 mL gives 2.0 sticks only because the arithmetic happens to cooperate.
Limitations
This is a fat equivalent and nothing more. Butter brings about 16% water that oil does not, so a cake, a pastry or a cookie made with the swapped amount will not taste or handle like the original: fat carries flavour and shortens gluten, while water steams and sets structure. Nothing here compensates, because compensating would take knowing what you are baking. Oil density is one figure, 0.92 g per mL, the middle of the 0.910–0.927 range Codex lists across oil types; real densities differ by about two percent.
Frequently asked questions
- How much butter do I use instead of one cup of oil?
- 268 grams, or about 2.4 sticks — noticeably more than a cup, and more than the cup-for-cup substitution most charts suggest. The arithmetic is two steps: a cup of oil weighs 217.7 g, and butter is 81.11% fat, so 217.7 ÷ 0.8111 = 268.4 g.
- Why is it not a one-to-one substitution?
- Because butter is not pure fat. Oil is around 100% fat, while butter is about 81% fat and 16% water, so equal weights do not carry equal fat. Matching the fat is the fairest rule available, but it is still not a behaviour match: the water in butter changes how a dough sets.
- Does vegetable oil weigh the same as melted butter?
- No. Oil is about 0.92 g per millilitre and melted butter about 0.91, which is close enough to be confusing — but the comparison that matters is fat, not weight. A tablespoon of oil is 13.6 g of pure fat; a tablespoon of butter is 14.2 g of which only 11.5 g is fat.
- Can I use this the other way round, butter to oil?
- Yes — multiply the butter by 0.8111. Two sticks of butter, 226.8 g, is 184 g of fat, which is 200 mL of oil. The second table on this page is exactly that direction, from a quarter stick up to a whole pound.
- Which is better in baking, oil or butter?
- They do different jobs, and the swap here only equalises fat. Oil stays liquid at room temperature, so it gives a moister, denser crumb and keeps cakes soft for days; butter is solid and creaming it traps air, which is what makes cookies spread and puff. For a straight butter-for-oil trade, expect the oil version to be a little flatter and the butter version a little firmer.
References
- Standard for named vegetable oils (CODEX STAN 210-1999) — relative density of named oils — FAO / WHO Codex Alimentarius
- 7 CFR § 58.305 — Meaning of words (butter: not less than 80 percent milkfat) — US Government Publishing Office, Electronic Code of Federal Regulations
- Ingredient Weight Chart — a cup of oil and a cup of butter in grams — King Arthur Baking