Oil to butter
1 ÷ 0.80 = 1.25, based directly on butter's approximate fat content.
The ratio, properly explained
Oil to Butter Ratio
The practical oil-to-butter multiplier is 1.25 because butter is about 80% fat. The commonly copied 1.333 figure comes from inverting 0.75 rather than balancing fat.
Oil to butter: multiply by 1.25. Butter to oil: use 0.80 for a reversible fat match or 0.75 as the familiar shortcut.
Use
1¼ cups
Which is also
- 284 g
- 20¼ tbsp
- 2½ sticks
- Quick rule: easy to remember and fine for most bakes. Switch to Exact for a fat-matched result.
- 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 | 240 ml × 1.25 = 300 ml |
|---|---|
| Source | 218 g · 218 g fat |
| Result | 283.75 g · 227 g fat |
| Ratio | ×1.3016 |
Common amounts
Oil to butter ratio chart
| Source | Quick | Exact | Exact grams |
|---|---|---|---|
| ⅛ cup | ⅛ cup | ⅛ cup | 34.06 g |
| ¼ cup | ⅓ cup | ⅓ cup | 68.13 g |
| ⅓ cup | ⅜ cup | ⅜ cup | 90.83 g |
| ½ cup | ⅝ cup | ⅝ cup | 136.25 g |
| ⅔ cup | ⅞ cup | ¾ cup | 181.67 g |
| ¾ cup | 0.94 cups | ⅞ cup | 204.38 g |
| 1 cup | 1¼ cups | 1¼ cups | 272.5 g |
| 1½ cups | 1⅞ cups | 1¾ cups | 408.75 g |
| 2 cups | 2½ cups | 2⅜ cups | 545 g |
What matters in the kitchen
How to use this conversion
Butter to oil
100 g butter carries about 80 g fat, so 80 g oil is the exact reverse by weight.
Why not 1.333
That number is 1 ÷ 0.75, an inversion of a rounded shortcut rather than a composition-based formula.
Questions about this tool
Oil to Butter Ratio FAQ
What is the key result from the Oil to Butter Ratio?
Oil to butter: multiply by 1.25. Butter to oil: use 0.80 for a reversible fat match or 0.75 as the familiar shortcut.
What should I keep in mind when using this oil to butter ratio?
The quick 1.25 and 0.75 multipliers do not round-trip: together they retain 93.75%, which is why Exact mode exists.
Oil to butter: what does that mean?
1 ÷ 0.80 = 1.25, based directly on butter's approximate fat content.