Exact vegetable oil conversion
30 ml oil to butter
30 ml of vegetable oil needs 34.1 g of butter for an exact fat match. The scale-friendly result comes from matching the fat, not simply multiplying the volume.
34.1 g
- ⅛ cup
- 2.44 tbsp
- ⅓ stick
- Butter is about 80% fat, so you need more of it by weight to carry the same fat as oil.
- About 80% fat, 16-17% water and milk solids. The water is why butter and oil are not a straight swap.
Show the maths
| Formula | 27.25 g × 1 fat ÷ 0.8 fat = 34.06 g |
|---|---|
| Source | 27.25 g · 27.25 g fat |
| Result | 34.06 g · 27.25 g fat |
| Ratio | ×1.25 |
The calculation
How much butter for 30 ml of oil?
30 ml of vegetable oil weighs 27.25 g. Oil is essentially pure fat, while standard butter is approximately 80% fat, so the oil weight is divided by 0.80.
The familiar quick rule is useful for everyday baking, but the exact result above is the better choice when structure and consistency matter.
Equivalent butter measures
34.1 g butter in other units
Quick answers
Questions about this conversion
How much butter replaces 30 ml of oil?
30 ml of vegetable oil needs 34.1 g of butter for an exact fat match. Round to the precision your kitchen scale can measure.
Should I melt the butter first?
Yes. Melt it gently and cool it slightly when the recipe originally uses liquid oil. Hot butter can scramble eggs or change how a batter emulsifies.
Will the recipe turn out exactly the same?
No. Butter adds water, milk solids and dairy flavour, and it firms as it cools. The fat is matched, but texture, browning and keeping quality can still change.