PJ Hamel, post author

May 30, 2015 at 10:42am

Hi - I substituted by volume, since that's how most people will do it. Our all-purpose flour weighs 4 1/4 ounces/cup, while whole wheat is 4 ounces/cup, so a slight difference if you're weighing. Not sure what you mean by "exchange ratio" - the blog details the percentage of substitution, if that's what you mean? Hope this helps – and good luck with your cake-baking! PJH
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