Anyone help with carb counting of a homemade cake please?

[OrchidLass]

I need to work out the carbohydrate content per 100g of a homemade cake and not sure where to start. Can anyone help?

I would add up the amounts of all the ingredients in the cake, then either divide by number of slices or if wanting to be accurate weigh the whole cake and then the slice to find the percentage.

I should probably have mentioned that I have dyscalculia which is why this is stressing me out so much.

Use an app like My fitness Pal (I use my Fitbit app). You are just finding the ingredients, it does the calculations.

So tell us what you put in it, and how much of the cake you've eaten. We'll work it out for you.

@SlidesAndLadders

So tell us what you put in it, and how much of the cake you've eaten. We'll work it out for you.

Thanks so much . It's not for me, a friend is having a little birthday celebration in the garden and she asked me to bake her a birthday cake in place of a gift. She has type 1 diabetes so will only have a little bit but I'd like to be accurate in the amount of carbs per 100g. To be honest I'm sure she can do it herself but I'd like to know how to do it anyway.

There's 250g flour, 250g sugar, butter, eggs, vanilla extract. The buttercream will have 250g butter and 500g icing sugar.

Plain flour is 3 cal per gram
Butter 7 cal per gram (apparently- on the same site it's sometimes listed as 1 calorie per gram)
Sugar 4 cal per gram
Eggs 70 cal each

So a basic sponge cake of 175g each of butter, sugar and flour plus 3 eggs is 1225+700+600+210= 2735 calories

Divide that by 6 slices and each slice is 455 calories
Now you have to add the icing, jam or whatever...

Oops cross posted

Oh God and I misread carbs as calories. Sorry [gets coat]

@PermanentTemporary

Oh God and I misread carbs as calories. Sorry [gets coat]

don't worry, thanks for contributing anyway!

Plain flour is 180g carb
Butter 0.4g carb
Sugar 750g carb
Eggs 1.1g carb each
Vanilla extract 0.5 carb in a tsp

I've assumed 250g butter although you don't say how much - how many eggs? (Although there's not much in them)

So far 1 slice of 6 from this cake would be around 160g carbs

@SlidesAndLadders

Plain flour is 180g carb Butter 0.4g carb Sugar 750g carb Eggs 1.1g carb each Vanilla extract 0.5 carb in a tsp

I've assumed 250g butter although you don't say how much - how many eggs? (Although there's not much in them)

So far 1 slice of 6 from this cake would be around 160g carbs

Thank you that's really helpful. How do i work out how much per 100g too?

Carbs per 100 g is only useful if you eat exactly 100 g isn't it?

The total weight of the ingredients is 1.7 kilo, so dividing by 6 is going to end up with a number far higher than the carbs per 100 g, probably more like 250-300 g. I think that would also be quite a large slice of cake, so if she's having a little bit it will be probably less than that.

I know that cake probably loses moisture during baking, so finished weight might be slightly less.

Who's eating the cake? If it's just you and her, I'd probably make a smaller cake, if she can't eat much of it, unless you want loads left over/wasted.

@BarbaraofSeville she can weigh out however much she wants (would be much less than 100g) and calculate how much insulin she needs as long as she knows how much it is per 100g. That's what she told me anyway!

There will be 6 of us today, but she wants to take some to work tomorrow too so wants a reasonable sized cake.