I was thinking about making a 14, 10, 6 wedding cake and the couple would save the 6". according to wiltons chart the 14 & 10 would serve 116. My question to you veteran wedding cake bakers is do you find this chart to be true... or do you find that couples run out of cake? I just want to make sure there will be enough.. I always tend to "throw in more cake" because it never looks like enough. But I want to really stop doing this and this cake design is only for 3 layers and I want to keep it this way..I just want to be sure that they will have enough cake.. Plus not everyone will show up right? I think Im just a little nervous.. 1st wedding cake. Ive done many bridal showers but my first wedding.
I don't think that'll be enough... http://www.earlenescakes.com/ckserchart.htm
Unless it is a cake and champagne reception only, you will have plenty of cake! Not everyone eats cake at a regular meal reception. As long as the caterers know how to cut a cake for a wedding, you'll be fine. Now, if their Aunt Mildred will be doing the honors, present her with a copy of a good cake cutting chart to ensure that she's not going to serve party sized servings.
I think the Wilton serving sizes are for true wedding cake pieces. Quite small. If the cake is dessert you could always make a sheet cake or two and just cover them with buttercream. The kitchen can cut them if they need it. My last wedding I thought they might run short so I make a lemon slab cake and they didn't need it. Made a nice extra dessert for the midnight buffet.
peggy porschen's book Romantic Cakes has a good guide in it for sizes and she made blocks to show the real piece sizes. HTH
I have a really silly question about Earlene's chart, so please bear with me. Column A is the pan size and then C is the serving size. Is that for a one layer cake? And then columns F and G are the bride's cake/groom's cake servings with the corresponding pan sizes. So, for instance if you need 70 servings you are going to use 6-9-12 inch layers, but are they one layer of cake or 2 layers for each size, stacked with icing in between? So for 70 servings would you be making (2) 6" layers, (2) 9" layers and (2) 12" layers or one of each size layer?
Sorry to sound so dumb- 
-these charts always confuse me on whether they are using one or two layers.....
Michele............I use Earlene's charts.......column C is the serving size of 2 - 2" layers of cake approximately 1 x 2 inches wide, 4 inches high, with filling/icing in between the layers. So, your example of 70 servings, yes, if you are saving the top, you would do 6, 9 and 12, using 2-2" layer cakes.......saving the top (acutally I think it calculates to 67 servings without the top). She also has instructions on how to cut the cake to her chart sizes..........it's all a matter of preference.........I just instruct the people cutting the cake about what sizes the servings need to be, and it works out fine. 
14/10/6 will be plenty. It's what I always use for ALL my weddings for 100 and I always have cake leftover. I go by the Wilton Chart. A 1x2x4 piece of cake is bigger than you think. People hear "one inch" and they are thinking micro-sliver .... it's not. Odds are also good that if they order cake for 100, they will only have 70-80 people there anyway. (I am obsessive about counting chairs, counting people, counting number of plates used, counting number of pieces of cake cut .... Debi Does Data!)
Here is a link to my pictorial on how to cut a cake. You are welcome to reference your brides to this .... if they are having a family member cut the cake, it will be helpful to them.
http://cateritsimple.com/_wsn/page19.html
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