Food & Cooking

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Food & Cooking

Butter to Oil Conversion Calculator.

Converts the amount of butter needed in a recipe to an equivalent amount of cooking oil, accounting for the water content difference.

Results update live as you type.
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Your inputs

How it works

  1. 1

    Enter the amount of butter your recipe calls for.

  2. 2

    Enter the fat percentage of your butter (typically 80% for standard butter).

  3. 3

    The calculator multiplies butter amount by fat percentage to get the oil equivalent.

  4. 4

    Use the result as the amount of oil to substitute.

butter_amount * (butter_fat_percent / 100)

Frequently asked questions

Why is the oil amount less than the butter amount?

Butter contains about 15-20% water and milk solids, which are not fat. Oil is 100% fat, so you need less oil to get the same fat content.

Can I use this for any type of oil?

Yes, the conversion is based on fat content, so it works for vegetable, olive, coconut, and other cooking oils.

What if my butter has a different fat percentage?

You can adjust the fat percentage input. European-style butters often have 82-85% fat, while some spreads have less.

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Results

Formula checked

Oil needed

0grams

Oil in tablespoons0tbsp
Oil in cups0cups
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Estimate for general guidance only — verify important decisions with an appropriate professional.

How it works

Converts the amount of butter needed in a recipe to an equivalent amount of cooking oil, accounting for the water content difference.

  1. Enter the amount of butter your recipe calls for.
  2. Enter the fat percentage of your butter (typically 80% for standard butter).
  3. The calculator multiplies butter amount by fat percentage to get the oil equivalent.
  4. Use the result as the amount of oil to substitute.

Formulas

The math behind this calculator, written out so you can verify the result.

Oil equivalent

Oil = Butter × (Fat% / 100)

Since oil is pure fat, you only need the fat portion of the butter.

Example:

Input: Butter = 100g, Fat% = 80%

Calculation: 100 × 0.80 = 80g

Result: 80g oil

Real-world use cases

Where this calculation shows up in everyday life.

Baking substitutions

Replace butter with oil in cakes, muffins, and quick breads for a moist texture.

Example: Use 80g oil instead of 100g butter.

Dietary adjustments

Reduce saturated fat by using a heart-healthy oil like olive or canola.

Example: Substitute oil in a cookie recipe.

Vegan cooking

Make recipes dairy-free by swapping butter for plant-based oil.

Example: Use oil in a pancake recipe.

Tips and common mistakes

Tips

  • For baking, you may need to adjust liquid ingredients slightly because butter adds water.
  • Use a kitchen scale for accurate measurements.
  • If using salted butter, reduce added salt in the recipe.
  • For savory dishes, you can often use a 1:1 swap without adjusting.

Common Mistakes to Avoid

  • Using a 1:1 ratio without accounting for water content.
  • Ignoring the fat percentage of different butter types.
  • Not adjusting for the moisture difference in baked goods.

Assumptions and limitations

  • Use the stated inputs and units.
  • Results are estimates for planning and education.
  • Check measurements and source data before making an important decision.