Quick rule
Multiply the butter amount by 0.75 when you need an easy kitchen estimate.
The reverse substitution
Butter to Oil Converter
Butter carries water and milk solids; oil does not. The familiar shortcut is to use ¾ as much oil, while Exact mode calculates the oil needed to carry the same amount of fat. Read our culinary guide on how oil changes baked textures.
Oil to butter converter
Use
0.9 ml
Which is also
- 0.8 g
- 0 cups
- 0 tbsp
- Oil is 100% fat, so you need less of it. Consider adding a splash of liquid to replace the water butter would have brought.
- Neutral flavour and 100% fat. The default oil in most recipes.
Show the maths
| Formula | 1 g × 0.8 fat ÷ 1 fat = 0.8 g |
|---|---|
| Source | 1 g · 0.8 g fat |
| Result | 0.8 g · 0.8 g fat |
| Ratio | ×0.8 |
For every 100 g of butter, the fat-matched answer is 80 g of oil, about 88 ml for vegetable oil.
Common amounts
Butter to Oil Conversion
| Source | Quick | Exact | Exact grams |
|---|---|---|---|
| 25 g | 19.8 ml | 22 ml | 20 g |
| 50 g | 39.6 ml | 44 ml | 40 g |
| 60 g | 47.6 ml | 52.8 ml | 48 g |
| 80 g | 63.4 ml | 70.5 ml | 64 g |
| 100 g | 79.3 ml | 88.1 ml | 80 g |
| 125 g | 99.1 ml | 110 ml | 100 g |
| 150 g | 119 ml | 132 ml | 120 g |
| 200 g | 159 ml | 176 ml | 160 g |
| 250 g | 198 ml | 220 ml | 200 g |
Popular butter to oil amount guides
What matters in the kitchen
How to use this conversion
Exact rule
Multiply butter weight by 0.80 to preserve its approximate fat contribution.
Replace lost moisture
Butter contains ~18% water; liquid oil has 0% water. Add roughly one tablespoon of milk or water per 100 g butter replaced to prevent dry bakes.
Calculations are fat-matched using official compositional benchmarks from the USDA FoodData Central and liquid density tables. Read our full methodology in our Editorial & Fact-Checking Policy.
Questions about this tool
Butter to Oil Converter FAQ
What is the key result from the Butter to Oil Converter?
For every 100 g of butter, the fat-matched answer is 80 g of oil, about 88 ml for vegetable oil.
What should I keep in mind when using this butter to oil converter?
Oil stays liquid at room temperature, so cakes may remain moist longer but lose some butter flavour and aeration.
Quick rule: what does that mean?
Multiply the butter amount by 0.75 when you need an easy kitchen estimate.