Hi,

this might sound a bit stupid but I'm baking a cake this week (Victoria sponge) but I'm wanting to do 3 layers/sandwiches instead of 2 as it never rises enough for me just doing 2. Does anyone have a recipe for this? Not sure how to calculate the 2 to make 3?

any advice would be great! Thanks in advance!

Normally I would say you need 1.5 times your recipe, but if there's not much rise, I'd double your recipe and then split evenly between three pans.  

If the batter is not rising enough maybe you are not putting enough batter in your pans.  Each pan should be filled at least 2/3rds full.  If you pan is 2" deep, then the batter should measure 1 1/3 to 1 1/2" deep.   You don't tell us what size your tin is nor how much batter the recipe you use makes so we can't really say how much you have to increase your recipe.