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Cake Pan Calculator / 9x13 pan to 8 inch round
King Arthur & Joy of Baking Geometry Standard

9x13 Pan to 8 Inch Round Cake Pan Conversion

Area-based volume scaling for round, square, loaf, Bundt, and 9x13 sheet pans.

Scaling Ratio
Requires 2 to 3 eight-inch rounds
Two 8-inch rounds hold 100 sq in (slightly smaller than 9x13); three 8-inch rounds hold 150 sq in.
Never fill pans more than 2/3 full
Interactive Pan Area Comparator

Pan Geometry & Oven Science Guide

A 9x13 rectangular pan has 117 sq inches of area. Two 8-inch round pans provide only 100.5 sq inches total, which is slightly too small for a full 9x13 recipe. Three 8-inch round pans provide 150.8 sq inches.

If converting a 9x13 recipe into 8-inch rounds, split the batter across three 8-inch pans for elegant, delicate layers, or divide between two 8-inch pans and use the leftover batter for 4 cupcakes.

Standard Cake Pan Surface Area & Volume Guide

Surface area dictates batter depth, while volume dictates maximum safe capacity.

Pan Name & Dimensions Surface Area Batter Capacity Ratio vs 8" Round
6-inch Round (2" deep) 28 sq in 4 cups 0.56x
8-inch Round (2" deep) 50 sq in 6 cups 1.00x (baseline)
9-inch Round (2" deep) 64 sq in 8 cups 1.27x
10-inch Round (2" deep) 79 sq in 10-11 cups 1.57x
8x8-inch Square (2" deep) 64 sq in 8 cups 1.27x (matches 9" round)
9x9-inch Square (2" deep) 81 sq in 10 cups 1.61x
9x13-inch Rectangle 117 sq in 14-15 cups 2.33x (matches two 9" rounds)
8.5x4.5-inch Loaf Pan 38 sq in 6 cups 0.76x
9x5-inch Loaf Pan 45 sq in 8 cups 0.90x
10-inch Bundt Pan 78 sq in 12 cups 1.55x
9-inch Springform Pan 64 sq in 10 cups (3" deep) 1.27x

Pan Substitution Rules & Baking Physics

The 3-Pan Solution

Split 9x13 batter across THREE 8-inch rounds for a stunning bakery-style 3-tier cake.

2-Pan Caution

If using only two 8-inch rounds, do not overfill; scoop out 1 cup of batter for cupcakes.

Baking Time

Three 8-inch layers will bake in just 18 to 22 minutes at 350°F.

Frequently Asked Questions

How many 8-inch round pans do I need for a 9x13 cake recipe? +
You need either three 8-inch round pans (for thin layers) or two 8-inch rounds plus 4 cupcakes.
Can I put all 9x13 batter into two 8-inch pans? +
No, two 8-inch pans hold only 100 sq inches vs 117 sq inches. Filling them completely risks overflowing in the oven.
How long do 8-inch round layers bake compared to a 9x13? +
8-inch layers bake in 20–25 minutes, about 10–15 minutes faster than a 9x13 sheet.

Related Pan Conversions

8 inch to 9 inch cake pan →9 inch to 8 inch cake pan →9x13 pan to round pan →9x13 pan to 9 inch round →8 inch round to 8 inch square →9 inch round to 8 inch square →9 inch round to 9 inch square →8 inch round to 9 inch square →8x8 square to 9x13 pan →9x9 square to 9x13 pan →8 inch round to loaf pan →9 inch round to loaf pan →10 inch bundt to 9x13 pan →10 inch bundt to round pan →6 inch to 8 inch cake pan →8 inch to 10 inch cake pan →
Baking & Kitchen Cluster Cross-Links

Verified ingredient weight conversions and pan geometry calculators across our baking suite:

Butter Sticks Converter 113.4g per stick Yeast Packet Converter 7g = 2 1/4 tsp Cake Pan Size Converter Area & volume 250g Butter to Sticks 2.2 sticks (block) 7g Yeast to Teaspoons 2 1/4 tsp 8" to 9" Cake Pan 1.27x factor 9x13 Pan to Round Two 9" rounds 1 Stick Butter in Grams 1/2 cup / 8 tbsp Instant vs Active Dry 1.25x ratio 9" Round to 8" Square Exact 1:1 match
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