My favourite sponge cake recipe (and how I scale it)
A reliable 8 inch 2-layer sponge recipe with bakery-style method notes and a built-in scaling workflow.
Free cake planning tools
Cake calculations in grams
Metric measures for UK bakers who do not measure in cups.
We built Cake Calcs because so many recipes use US cup measurements. Here, calculations are based on UK-style grams, while still keeping inches available where they make sense, like cake sizes.
Featured calculators
Sponge Cake Calculator
Use this sponge cake calculator to scale a classic 8 inch 2-layer sponge recipe to your chosen round size and layers.
Quick Round Cake Buttercream Calculator
Get a fast estimate for standard round cake sizes in seconds.
Custom Shape Cake Buttercream Calculator
Calculate more specific totals from exact shape and dimensions.
Pan size converter
Translate round pans into square or rectangular alternatives without guesswork.
From the blog
Keep your favourite cake recipe, change the pan shape
Use an equivalent tin size when you love the recipe you already have but need a different cake shape for the finish.
How much buttercream do I need? Formula explained
Learn the frosting-area method behind our estimate of 200g butter per 1,000cm² and how to adjust for decoration style.
How to estimate cake bake time (without relying on one chart)
A practical method for setting a check window and testing doneness, with clear notes on oven, recipe, and pan-depth variation.
My favourite simple chocolate cake: moist, dense, and always loved
A trusted BBC recipe with practical notes on bake time, tin choice, ganache filling, buttercream quantities, and fondant warnings.
Why bakers use Cake Calcs
- UK-first ingredient totals in grams, with inch options when useful.
- Simple tools that work on mobile and desktop.
- Helpful baking advice for both first-time and experienced bakers.