So, I have never stacked cakes before and I will be doing this for my brothers wedding in March. My question is there a size method when stacking? I mean do you stack a 6" on top of a 10" or do u use an 8". If the bottom is 12" what size would u use next and so forth?
I agree.. a 4 inch difference is ideal. However, servings sometimes ruin that plan. 
The last stacked cake I did was a 12, 10 and 8 and I thought it would look a little "off", but it ended up okay...it depends on what kind of design you are doing and if you require more room to decorate around the base of each layer.
Good Luck!
angie
4 inches difference between the tiers looks really good, but you can also go as little as 3 between. I am doing a wedding cake tomorrow that is a 12", 9", 6". What I wouldn't do is go as low as 2" between...it just leaves too little room on the sides, especially if you're using fondant (and the corners are rounded).
Earlene's serving chart has size combinations and servings already figured out...I find it very, very useful:
http://www.earlenescakes.com/ckserchart.htm
If anyone would look at Earlenes chart and explain the last column to me I sure would appreciate it. Actually could you explain how to use this chart.
Also there is no D column.
Thank you so much.
Oh lord! Her explanations and column labels are all messed up!
A = Pan Size
B = Pan Circumference
C = Servings
E = # of 1" Lace Points
The last 3 columns, F, G and 'blank' are totally separate from ABCE.
F = Number of bride's servings, (not using top tier)
G = Number of groom's servings (using top tier)
The last column on the right is the combination of pans you would use to achieve the number of bride/groom servings you want. So, according to her servings, if you have a bride who wants a cake for 70, you go down the 'F' (pink) column, find 70, then move over to the far right column. 70 bride's servings is a 12", 9", and 6" pan.
So you can always go straight to the right combination of pans for the number of servings you need. She also doesn't go less than 3" between tiers.
I just posted a pic in my photos today that may give you an idea. It's the Red Ribbon Cake (last photo). It's a 4-tier, sizes are 14 / 10 / 8 / 6. So there are 4 inches between the bottom 2, and 2" between all others. You should be able to see what kind of spacing there is and compare that to what kind of spacing you need. Hope this helps!
I just posted a pic in my photos today that may give you an idea. It's the Red Ribbon Cake (last photo). It's a 4-tier, sizes are 14 / 10 / 8 / 6. So there are 4 inches between the bottom 2, and 2" between all others. You should be able to see what kind of spacing there is and compare that to what kind of spacing you need. Hope this helps!
That looks very pretty! I guess you can mix and match to what you like best!
Similary, I just posted a 6", 9", 12". It's the 3-tier 'New Year's Day Wedding' cake with red and orange roses in my photos. I actually really like that particular combination.
Beautiful! You know, I'm really starting to miss making BC roses and all the other decor that used to be on cakes. Brides are going for the "simplicity is elegant" look. It's ok by me, though ..... less work! 
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