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.
For every 100 g of butter, the fat-matched answer is 80 g of oil, about 88 ml for vegetable oil.
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 |
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 |
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 the water
Add roughly one tablespoon of milk or water per 100 g butter replaced when moisture matters.
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.