How big a cake do you need? Enter the number of guests, pick the occasion and slice size, and the cake portions calculator suggests tier sizes that fit. Open any suggestion to fine-tune in the tiered cake calculator.
This free cake portions calculator estimates how many servings a cake produces based on tier dimensions, slice weight and the occasion. Pick a guest count, slice size and pan shape — Cookara suggests one, two and three-tier cakes that match.
Wedding slices are about 100 g (2.5 × 5 cm fingers). Standard birthday or party slices are roughly 170 g. Hearty dessert servings — when cake is the main course — run around 200 g per portion.
60 guests × 100 g = 6000 g of cake · A two-tier cake with ø25 cm + ø18 cm round tiers at 10 cm height covers it.
Square cakes give roughly 25–30% more servings than round cakes of the same width because there are no off-cuts. Switch the cake type above to compare both.
Whether you are planning a wedding, a birthday party, an anniversary or a christening, the Cookara cake servings calculator turns guest counts into real cake portions. Match the slice size to the occasion, choose round or square tiers, and the calculator suggests cake sizes that feed everyone — no spreadsheets, no guessing.
Wedding cake portions are smaller than dessert slices — typically around 100 g per serving — so a tiered wedding cake feeds more guests than its size suggests. Try the wedding slice size with 80, 100 or 150 guests to see suggested two and three-tier cake combinations.
For a birthday party, plan around standard 170 g slices. A round 20 cm cake usually serves 8–12 birthday portions, while a 25 cm cake comfortably handles 16–20. Use the cake portions calculator above to size your cake to the guest list, not the other way round.
Anniversary cakes often sit between wedding and birthday slice sizes. Pick the anniversary occasion above and the calculator biases its suggestions toward elegant, taller tiers that look impressive on the dessert table while still feeding every guest.
Cake decorators can use the servings calculator together with the cake dimensions calculator to estimate batter weight, the pan converter to swap pan sizes, and the tiered cake calculator to fine-tune each tier. For full recipe planning on the go — scaling recipes to any pan size and pricing every slice — try the free Cookara app on iOS and Android.
A 20 cm (8 inch) round cake at standard 10 cm height yields about 12 birthday-size portions (170 g each) or roughly 20 wedding-size portions (100 g each). Use the calculator above to confirm with your own slice size.
Wedding slices are traditionally cut as 2.5 × 5 cm fingers, around 100 g each. Pick the wedding serving preset and the cake portions calculator will size the cake accordingly.
As a rule of thumb, one tier feeds up to ~30 guests, two tiers up to ~80, and three tiers up to ~150 with wedding slice sizes. Enter your exact guest count above for an accurate suggestion.
Square cakes feed about 25–30% more guests than round cakes of the same width, because square slices waste no off-cuts. Toggle the cake type above to compare suggested sizes for the same guest count.
Yes — the cake portions calculator on this page is free to use, with no signup. Install the Cookara app on iOS or Android to save calculations, scale recipes and price every slice.