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Baking Pan Size & Recipe Scaling Converter

Scale cake and baking recipes by 3D pan volume (with pan height) or 2D surface area, preview true-scale batter depth and overflow risk, apply non-linear baking time and egg rules, and split batches across multiple pans.

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Pan dimensions & scaling mode

Supports Round (πr²h), Square (s²h), Rectangular, Bundt (0.75× tube), and Cupcakes (3.5 fl oz)

Scaling mode

Dimension unit

Original recipe pan shape

Original diameter / side

Original pan depth (height)

Your target pan shape

Target diameter / side

Target pan depth (height)

Original recipe bake timeused for √(depth ratio) time rule

mins

Original oven temperature177 °C

°F

Recipe ingredients

One ingredient per line (supports grams, oz, cups, tbsp, tsp, fractions, and whole eggs)

Paste or edit ingredient list

How 3D Pan Volume, Batter Depth & Bake-Time Physics Work

3D Volume vs. 2D Area: Round pans use V = π · r² · h, square pans use V = s² · h, rectangular pans use V = W × L × h, Bundt pans apply a 0.75 hollow-chimney factor (V = 0.75 · π · r² · h), and standard cupcake wells hold 3.5 US fl oz (6.32 in³) each.

Batter Depth Prediction: Dividing scaled total volume by the new pan's cross-sectional area gives the new effective depth. When depth_new / depth_old > 1.35×, we flag a red risk of overflow; when < 0.60×, we flag a yellow too shallow, will overbake alert.

Thermal Diffusion Time Law: Heat penetrates cake batter by vertical conduction, so baking time scales roughly with the square root of the depth ratio: t_new = t_old × √(depth_new / depth_old).

Result & Batter Depth Prediction

Scaling by 3D pan volume (includes height)

Recipe scaling multiplier

1.19×

3D volume ratio: 1.19× · 2D area ratio: 0.79×

Predicted batter depth

3.00 in (1.50×)

>1.35× original (2.00 in) — risk of overflow

Adjusted bake time

43 mins

From 35 mins × √(1.50) at 350°F

Pan capacity (rim-full)

8.7 → 10.3 cups

70.5 fl oz → 83.6 fl oz

Batter Depth Alert (3.00 in vs 2.00 in = 1.50×): risk of overflow

Predicted depth in your 8in round pan is 3.00 inch (2/3 batter level: 2.00 inch), which exceeds 1.35× the original pan depth (2.00 inch) — risk of overflow and raw center. Switch to 2D Surface Area mode (0.79×) or split excess batter into cupcakes below.

True-scale pan & batter cross-section (inline SVG)

Left: Original pan profile · Right: Target pan profile with proportional batter fill height

What does NOT scale (Anti-Failure Baking Rules Engine)

Why oven temperature, bake time, chemical leaveners, and eggs never scale linearly

a) Oven temperature stays constant (350°F / 177°C)

Never multiply oven temperature by the recipe scaling factor (1.19×). Keep the oven at 350°F (or reduce by 15–25°F to 330°F only when batter depth exceeds 1.25× so edges do not burn before the center reaches 200°F).

b) Bake time scales by square root of depth ratio: t_new = 35 × √(3.00 / 2.00) = 43 mins

Formula: t_new = t_old × √(depth_new / depth_old) = 35 min × √(1.50) = 42.9 mins. Start checking with a toothpick at 39 minutes and expect doneness around 43 minutes.

c) Baking powder & baking soda are non-linear (current scale: 1.19×)

Your multiplier (1.19×) is within the 0.7×–1.4× safe linear zone. Whenever scaling <0.7× or >1.4×, do not scale baking powder/soda linearly by volume — weigh in grams on a precision scale and run a small test bake.

d) Eggs in whole count + grams dual format (1 large egg ≈ 50 g — never "0.6 eggs")

For your scaled batch: 4 whole eggs + 37 g beaten (or ~5 whole = 250 g) — exact liquid weight 237 g (4 eggs + 37 g). To measure partial eggs accurately, whisk whole eggs in a bowl and weigh out the exact gram target on a kitchen scale.

Ingredient	Original	Scaled (grams)	Scaled (cups / kitchen)
unsalted butter, softened	225.00 g	267 g	1.17 cups
granulated sugar	1.50 cups	356 g	1 3/4 cups
large eggs	4.00	237 g (4 eggs + 37 g)	4 whole eggs + 37 g beaten (or ~5 whole = 250 g)
all-purpose flour	2.25 cups	320 g	2 2/3 cups
baking powder	2.50 tsp	14 g	3.0 tsp
fine sea salt	0.50 tsp	4 g	0.6 tsp
whole milk	0.75 cup	213 g	0.89 cups
vanilla extract	2.00 tsp	12 g	2.4 tsp
Estimated total batter weight	1,199 g	1,422 g	50.1 oz

Multi-pan split & printable recipe card

Prevent overflow by dividing deep batters across multiple pans or standard 3.5 fl oz cupcakes

ProMulti-pan split plan + scaled recipe card$9.99 once

Total scaled batter: 1,422 g · Container fill weights & depth-adjusted bake times

Split Plan Option	Containers Used	Batter Weight per Container	Est. Bake Time (@ 350°F)
Plan A · Split evenly into 2 target pans	2 × 8in round pans	711 g / pan	30 mins
Plan B · 1 safe target pan + leftover cupcakes	1 × 8in round + 7 cupcakes (3.5 fl oz)	948 g pan + 68 g/cupcake	35 mins (pan) / 28 mins (cupcakes)
Plan C · 100% standard cupcakes (3.5 fl oz)	22 × standard cupcake wells	65 g / cupcake	28 mins

Printable Recipe Card · 9in round (2in) → 8in round (3in)Scale: 1.19× · Bake: 43 mins @ 350°F

unsalted butter, softened: 267 g (1.17 cups) · granulated sugar: 356 g (1 3/4 cups) · large eggs: 4 whole eggs + 37 g beaten (or ~5 whole = 250 g) · all-purpose flour: 320 g (2 2/3 cups) · baking powder: 14 g (3.0 tsp) · fine sea salt: 4 g (0.6 tsp) · whole milk: 213 g (0.89 cups) · vanilla extract: 12 g (2.4 tsp)

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Built from user complaints

What people hate about the other tools

We read the reviews of the incumbents before writing this page. Every complaint below maps to a decision in the tool above.

Swapping pan sizes by surface area alone ignores pan depth, causing batter to overflow past the 2/3 fill line or bake unevenly.
r/Baking & r/BakingNoobs (Reddit) · ignores pan height
In this toolComputes both 2D area and 3D volume ratios with a visual batter fill-level gauge and >75% overflow warning.
Beginners mistakenly scale baking time and oven temperature proportionally when moving batter into a deeper or shallower pan.
r/Baking (Reddit) · wrong bake temp/time
In this toolBuilt-in rule card warns against proportional time scaling and suggests -25°F (-15°C) for deeper batters or glass pans.
1.333 cups of flour and 0.41 tablespoons of baking soda — existing scalers output awkward decimals impossible to measure.
gigacalculator.com / r/Baking (Reddit) · unusable decimals
In this toolConverts awkward scaled decimals into exact kitchen spoon fractions (e.g., 1 tsp + 1/4 tsp) or precise gram weights.

One-line difference: 3D pan volume & area scaler with fill-level overflow alerts, bake temp/time adjustments, and instant gram conversion.

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Round, square, loaf & tube pan 2D area and 3D volume conversion
Smart full-recipe text scaler with gram and spoon-fraction output
Non-linear baking temp, time, and leavening adjustment warnings

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Multi-pan batch splitting with leftover cupcake yield calculator
Recipe ingredient cost & per-slice pricing calculator
Custom pan library in localStorage & watermark-free PDF recipe card

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