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

8 Inch Round to 8 Inch Square Pan Converter

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

Scaling Ratio
1.27x (Square is 27% larger)
An 8" square pan holds 64 sq in vs 50 sq in for an 8" round. Scale batter up by 25% or layers will be thin.
Never fill pans more than 2/3 full
Interactive Pan Area Comparator

Pan Geometry & Oven Science Guide

An 8-inch round pan has an area of 50.27 sq inches, while an 8x8-inch square pan has an area of 64 sq inches. The square pan is 27.3% larger than the round pan.

If you pour an 8-inch round cake recipe into an 8x8 square pan without scaling, the cake will bake about 21% thinner. Multiply ingredients by 1.25x for normal thickness, or reduce bake time by 4 minutes.

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

Area Difference

An 8x8 square holds 27% more batter than an 8-inch round (64 sq in vs 50 sq in).

Corner Browning

Corners in square pans receive heat from two sides and bake faster than the center.

Scaling Factor

Multiply recipe by 1.25 for standard layer height in the square pan.

Frequently Asked Questions

Can I substitute an 8-inch square pan for an 8-inch round pan? +
Yes, but the square pan is 27% larger, so the cake will be thinner. Reduce baking time by 3 to 5 minutes.
How much more batter does an 8x8 pan hold than an 8-inch round? +
An 8x8 square pan holds 27.3% more volume than an 8-inch round pan.
Do square cake pans bake differently than round pans? +
Yes, the corners of square pans absorb more heat and set faster. Grease corners thoroughly and check doneness early.

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 8 inch round →9x13 pan to 9 inch round →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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