I have a client that the family has an allergy to butter. I need to make their cake with oil. How do I convert a butter receipe into oil? And what is the difference between vegtable oil and olive oil? Thanks for your help.
My particular receipe calls for 2 sticks of butter. Thanks again.
Ok here's what i found out on google lol
1 stick of butter is equal to 1/4 of a cup
1/4 of a cup is equal to 3 tablespoons of oil
Here is a conversion chart for you as well:
http://www.goodcooking.com/conversions/butt_oil.htm
With the oils, if you have to i personally would suggest using an extra-light or light olive oil. It doesn't have the flavour of full strength olive oil so won't make your cake etc taste olive oily and it a lot healthier than a lot of other oils because it is higher in mono-unsatured fat (the good fat) then the saturated fat (the bad fat).
HTH 
In the U.S., a stick of butter weighs 4 oz. (1/4 pound) but its volume is 1/2 cup or 8 Tbsp.
So two sticks of butter would equal 8 oz. ( 1/2 pound) or 1 cup (16 Tbsp.)
According to your conversion chart, the correct substitution would be 3/4 cup olive oil.
HTH
Elise87, You certainly get points for trying! 
Baking/Cooking in America can be confusing because some of our measurements are by weight and some are by volume...
International cake glossary:
http://cakecentral.com/cake-decorating-ftopict-603444-.html
AU/US/UK measuring cup differences:
http://cakecentral.com/cake-decorating-ftopict-582763-.html
HTH
I have a client that the family has an allergy to butter. I need to make their cake with oil. How do I convert a butter receipe into oil? And what is the difference between vegtable oil and olive oil? Thanks for your help.
My particular receipe calls for 2 sticks of butter.
There is not straight substitution of oil for butter in a recipe made for butter. There is no reason to think that a substitution would produce your normal cake. One is solid and the other is liquid - oil is a pure fat while butter is about 80% fat.
A substitution of a dairy-free or vegan spread would be more likely to work ..
Or find a recipe formulated for oils ..
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