Is it possible to know how much the cake weighs using a specific size of cake pan before baking? I mean to say if I need 1 kg cake so how can I know how much batter will give me the desired weight and which size pan I need. Please help me.

I don't think you can know this universally for all recipes in a given pan because the ingredients will determine the weight more than the size of the pan. A vanilla cake is much lighter than say a carrot or banana cake. You would have to be really precise in your measurements to know this for even one recipe down to weighing the eggs.

Why not make your batter, weigh out 1 kg. and figure out what size pan it fits in? The baked cake may weigh less due to evaporation, so it will take trial and error. 

ok dear. i understand your opinion. actually I'm new in baking industry and now I'm taking few orders. here clients ask for cake weight say 1 kg , 2 kg like that. I'am little bit confused if somebody asks for 1 kg cake which cake pan I have to use. now I'll keep mind about the recipe as you said above. if the recipe calls for simple vanilla cake it obviously need more batter than that of carrot cake or banana cake. I'll keep this in my mind. thanks a lot for your information. 

thank you so much. this is a great idea dear. next time I'll use this trick. thanks a lot. 

this is not for the caribbean fruit cake is it? idk i think there's a certain cake or maybe a lot of different cakes in one of the caribbean countries that sells cakes by weight or is it africa?

In the states we don't sell by weight but by servings. So are there recipes that already exist where you are that have already done the figuring for you? It would take a lot of experimenting for me to figure out something like this but @hippiecac ‍ has given you an excellent jumping off point. Does the 1 kg also include frosting?

certain places in the world (somewhere) sell cakes this way

sorry for replying late. I was a bit busy last few days. I'm not talking about any specific cake my dear. here in this part of the world every cake is ordered in terms of weight. like 1 kg 2 kg like that. that's why I wanted to know the way to know the weight of the cake before baking it. :)

yeah I know dear in most of the places cakes ar ordered as per serving but here n this part of the world cakes are sold in terms of weight. yeah it's included frosting. so that means I have to weigh the cake in such a way so that after frosting it comes round about 1 kg.

So there must be a general standard of what size a 1 kg cake is expected to be. I'm assuming it's not exactly 1 kg because that would be crazy hard to accomplish. Are there bakeries near you that have cakes and their prices on display? If there are, I would go there and take note of their approximate cake sizes to get an estimate of how big your cakes should be. I'm guessing it's okay to be a little over, but they still pay by the total weight.

thanks dear. this is very logical suggestion. here are some supermarkets where the sell such cakes. it's better I can check it from there at least to get some ideas. thanks for this idea.