Recipe adaptation calculator by mold
Adjust your recipe for a different mold: ingredient ratio, adjusted baking time, and number of servings. Automatic real-time calculation.
Round: Dim 1 = diameter, Dim 2 empty. Square: Dim 1 = side. Rectangle/Heart/Oval: Dim 1 = length, Dim 2 = width. Savarin: Dim 1 = outer Ø, Dim 2 = inner Ø.
Same rules as opposite. For layer cakes, allow 4 to 5 cm of batter per tier.
Your adjusted ingredients
Baking time is not proportional to volume. Our formula uses the cube root of the ratio, which corresponds to the actual heat diffusion in the mass. For a mold twice as large: about +26% baking time.
Always check baking with a knife tip. Start checking 5 minutes before the estimated time.
How the calculator works
Define the source mold
Choose the shape of your recipe’s mold, then enter its dimensions and the resulting batter height.
Define your mold
Enter the dimensions of your mold and the desired batter height. The ratio and baking time are calculated in real time.
Adjust your ingredients
Enter the quantities from your original recipe. The adjusted values appear instantly on the right.
Mold reference table
| Mold | Dimensions | Volume | Servings | Usage type |
|---|---|---|---|---|
| 15 cm round | Ø 15 cm | 707 cm³ | 4 to 6 | Individual tart |
| 18 cm round | Ø 18 cm | 1,018 cm³ | 6 to 8 | Cake for 4 people |
| 20 cm round | Ø 20 cm | 1,257 cm³ | 8 to 10 | Amateur layer cake |
| 22 cm round | Ø 22 cm | 1,521 cm³ | 10 to 12 | Family birthday |
| 24 cm round | Ø 24 cm | 1,810 cm³ | 12 to 16 | Standard professional layer cake |
| 26 cm round | Ø 26 cm | 2,124 cm³ | 16 to 20 | Large family cake |
| 28 cm round | Ø 28 cm | 2,463 cm³ | 20 to 24 | Wedding cake bottom tier |
| 30 cm round | Ø 30 cm | 2,827 cm³ | 25 to 30 | Reception, event |
| 18 cm square | 18 × 18 cm | 1,296 cm³ | 9 to 12 | Brownies, financiers |
| 20 cm square | 20 × 20 cm | 1,600 cm³ | 12 to 16 | Bars, operas |
| Square 24 cm | 24 × 24 cm | 2,304 cm³ | 16 to 20 | Geometric layer cake |
| Rectangle 30×20 | 30 × 20 cm | 2,400 cm³ | 15 to 20 | Sheet cake, catering |
| Rectangle 35×25 | 35 × 25 cm | 3,500 cm³ | 20 to 28 | Large batches |
| Rectangle 40×30 | 40 × 30 cm | 4,800 cm³ | 30 to 40 | Puff pastry, mille-feuille |
Mathematical formula used
Volume calculation
Round: π × (Ø/2)² × H
Square: side² × H
Rectangle: L × W × H
Oval: π × (L/2) × (W/2) × H
Heart: 0.82 × L × W × H
Savarin: round volume minus central cylinder volume
Ingredient ratio
Ratio = Target Volume ÷ Source Volume
Each ingredient is multiplied by this ratio.
Baking time
Target T = Source T × ratio1/3
Cube root of the ratio, much more accurate than simple multiplication.
Frequently Asked Questions
How to adapt a recipe from a round mold to a square mold?
Select "Round" with its diameter in Dim 1, then "Square" in your mold with its side in Dim 1. The calculator automatically converts volumes.
Quick equivalence: a round mold Ø 22 cm equals a square mold 20 cm.
Find all our sizes in the round, square, rectangle & heart molds collection.
How to adjust a recipe for a layer cake?
For a layer cake, calculate each layer separately. For a 20 cm × 12 cm high layer cake (3 layers of 4 cm), enter "round 20 cm × 4 cm" and multiply the recipe by 3.
Dedicated equipment is in our layer cake selection; for even layers, cut with a cake lyre.
How to know how many slices?
Practical rule: 1 standard slice = 60 to 80 cm³. For a generous dessert 100 cm³, for petits fours 30 cm³.
For your customers, see our price per slice calculator.
Does baking time really vary depending on the mold?
Yes, but not linearly. For a mold twice as large, the time increases by about 26% only. It’s the cube root of the ratio.
What batter height should be indicated?
The height of the baked batter, not the mold:
3 to 4 cm standard cake.
4 to 5 cm layer cake before cutting.
2 to 2.5 cm thin sponge.
5 to 6 cm charlotte or entremets.
Should the oven temperature be adjusted?
Generally no: the temperature stays as per the recipe, only the time changes.
Exception: for a very large mold (ratio over 2), lower the temperature by 10-15°C and extend the time.
