Quick answer
A 2 layer 10 inch round cake takes about 7.7 cups of buttercream, roughly 3.9 lb. That covers a crumb coat and a final coat over 116.6 square inches of side and 78.5 of top, plus filling between layers and a fifth again for piped borders.
KitchenAid KFE5TS Flex Edge Beater for 4.5 and 5 Quart Tilt-Head Mixers
A flexible silicone edge that wipes the bowl wall as it turns, which is the single attachment that most improves buttercream, because unmixed butter clinging to the side is what makes a batch look curdled.
Best for: buttercream and creaming butter and sugar
Check price on AmazonMake 7.7 cups of buttercream for a 2 layer 10 inch round cake, which is about 3.9 pounds. That is not a guess: the cake has 116.6 square inches of side and 78.5 square inches of top, and a crumb coat plus a final coat over that area is a calculable volume.
Change the size or the coats in the frosting calculator, or see the whole range at once on the frosting quantity chart.
How much buttercream does a 2 layer 10 inch round cake need?
| What it covers | Area (sq in) | Thickness (in) | Basis |
|---|---|---|---|
| Sides | 116.6 | 0.375 crumb plus final | Derived area, convention thickness |
| Top | 78.5 | 0.375 crumb plus final | Derived area, convention thickness |
| Filling between layers | 78.5 | 0.25 | Derived area, convention thickness |
| Borders and piping | Allowance | 20 percent on top | Trade convention |
| Total | 7.7 cups | Derived from the above |
How much extra should I make?
More than you think, and for a reason that is not waste. Buttercream left in the bowl, stuck to the paddle and lost in the piping bag adds up to most of a cup on a cake this size. A batch that comes out exactly to the calculated figure will run short.
| Finish | Buttercream needed (cups) | Why |
|---|---|---|
| Naked or semi-naked | 3.5 | Filling plus a thin scrape, most of the side left bare |
| Smooth coat, no piping | 6.2 | Crumb coat and final coat, nothing else |
| Smooth coat with borders | 7.7 | The figure on this page, with a fifth allowed for piping |
| Heavily piped or rosette covered | 12.3 | A piped surface uses far more than a scraped one |
| Under fondant | 5.4 | A thinner, firmer coat, because the fondant is the finish |
Before this cake leaves the kitchen
A few things worth knowing before this cake leaves the kitchen. Cream cheese frostings and anything with whipped cream need refrigeration, and plain buttercream softens in a warm room long before it is unsafe, which is a structural problem rather than a health one. Royal icing made with raw egg white, and mousses set with raw egg, are worth swapping for pasteurised egg white or meringue powder when you are baking for children, older guests or anyone pregnant. If you are baking for other people, ask about allergies before you start rather than after, because cross contact happens at the mixing bowl and not at the table. And if you are selling rather than giving cakes away, that is governed by your state cottage food law, which varies a great deal and is worth reading once properly.
What this job actually needs
KitchenAid KFE5TS Flex Edge Beater for 4.5 and 5 Quart Tilt-Head Mixers
$49.99A flexible silicone edge that wipes the bowl wall as it turns, which is the single attachment that most improves buttercream, because unmixed butter clinging to the side is what makes a batch look curdled.
Best for: buttercream and creaming butter and sugar
Check price on AmazonAmazon prices move often, so check before you buy.
Ateco Stainless Handle Bench Scraper, 5.9 x 3 in
$9.99A straight stiff edge held vertical against a turning cake is how a sharp buttercream side is made, and a bench scraper does it better than a curved comb.
Best for: sharp-edged buttercream
Check price on AmazonAmazon prices move often, so check before you buy.
Ateco Revolving Cake Decorating Stand, Aluminum Turntable with Cast Iron Base
$68.26The cast iron base is the whole point: a heavy turntable keeps spinning at a steady speed while you hold a scraper still, which is what produces a smooth side.
Best for: smooth buttercream sides
Check price on AmazonAmazon prices move often, so check before you buy.
Questions people ask
- Is 7.7 cups of buttercream one batch or two?
- That depends on your recipe, but a standard American buttercream made with one pound of butter and two pounds of icing sugar yields roughly five cups. So 7.7 cups is about 1.5 batches. Swiss meringue buttercream yields less per pound of butter because it is lighter, and a whipped ganache yields less again.
- Do I really need a crumb coat?
- On any cake you want to look clean, yes. The crumb coat is a thin layer whose only job is to trap loose crumbs so the final coat goes on over sealed cake rather than over bare crumb. Skip it and you will drag brown flecks through the finish coat no matter how careful you are. It costs about an eighth of an inch of buttercream and thirty minutes in the fridge.
- How much more does a taller cake need?
- Proportionally more side, and side is where most of the frosting goes. Going from two layers to three on a 10 inch round cake increases the side area by roughly half, which is why the three layer version of this page gives a different figure. The top area does not change at all, since the cake is no wider.
Related pages
- How Much Frosting for a 2 Layer 10 inch springform Cake?
- How Much Frosting for a 2 Layer 10 inch square Cake?
- How Much Frosting for a 2 Layer 11 x 15 inch rectangle Cake?
- How Much Frosting for a 2 Layer 12 inch round Cake?
- How Much Frosting for a 2 Layer 12 inch square Cake?
- How Much Frosting for a 2 Layer 12 x 18 inch rectangle Cake?
How this page was put together
Researched from pan geometry, published manufacturer capacities, published serving conventions and university extension guidance. Not hands-on testing, and not professional advice.
Figures are labelled as derived, published or trade convention. Where no honest figure exists, the page says so rather than filling the gap.