Exact butter to oil substitution
100g butter to oil
100g butter replaces with 80 g (approx. 88 ml / 6 level tablespoons) vegetable oil under the classic baking shortcut, or 80 g of oil for an exact fat-weight match.
Oil to butter converter
72 g
- 79.3 ml
- ⅓ cup
- 5⅜ tbsp
- Quick rule: easy to remember and fine for most bakes. Switch to Exact for a fat-matched result.
- Neutral flavour and 100% fat. The default oil in most recipes.
Show the maths
| Formula | 105.73 ml × 0.75 = 79.3 ml |
|---|---|
| Source | 100 g · 80 g fat |
| Result | 72.03 g · 72.03 g fat |
| Ratio | ×0.7203 |
The calculation
How much oil replaces 100g butter?
Butter is roughly 80% butterfat and 16% to 17% water, whereas vegetable and canola oils are 100% pure fat. When swapping butter for oil, applying a 1:1 volume swap adds 20% more fat and removes moisture.
Moisture compensation: 100g of butter contains 16g of water. In European sponge bakes or loaf cakes, add 1 tablespoon (15 ml) of milk or water to replenish the liquid lost by switching to pure oil.
Equivalent measurements
100g butter in oil units
Quick answers
Frequently asked questions
How many grams of oil do I need for 100g of butter?
You need exactly 80 grams of vegetable oil. Butter is 80% fat, so 100g × 0.80 = 80g pure oil.
How many millilitres or tablespoons is 80g of oil?
80g of vegetable oil has a volume of approximately 88 millilitres, which equals roughly 6 level US tablespoons.
What if the recipe calls for European 82% butter?
For European butter with 82% fat, 100g butter contains 82g fat, so use 82g of vegetable oil.