9×13 → 8×8
Input
117 sq in → 64 sq inOutput
×0.54764÷117≈0.547 — a bit more than half.
Cake pan conversion compares **top surface area** of the original and new pans.
**Formula:**
Rectangular area = length × width (inches)
Round area = π × (diameter ÷ 2)²
Scale factor = new area ÷ original area
Scaled amount = recipe amount × scale factor
**Example — 9×13 → 8×8:**
117 ÷ 64 factor from original → new: **64 ÷ 117 ≈ 0.547**
Top surface area of new pan divided by original pan area, applied uniformly to batter and ingredients.
Formula
scale_factor = to_area_sq_in / from_area_sq_in; scaled = amount × scale_factorEnter shape and dimensions (e.g. 9×13 rectangle or 8″ round).
The pan you want to bake in instead.
Enter one ingredient amount to see the converted value.
Apply the scale factor to every ingredient in the recipe.
Smaller/thicker layers may need longer baking — test with a toothpick.
Input
117 sq in → 64 sq inOutput
×0.54764÷117≈0.547 — a bit more than half.
Input
50.3 → 63.6 sq inOutput
×1.26Larger round needs ~26% more batter.
Input
9×13→8×8, 2 cupsOutput
1.09 cups2 × 0.547 ≈ 1.09 cups.
Input
117 → 45 sq inOutput
×0.385Loaf pan holds less than half a sheet.
Common real-world scenarios where this tool saves time.
9×13 brownie recipe → 8×8 pan, ~0.55× batter.
8″ round → 9″ round for a larger layer cake.
Split 9×13 batter between two 9″ round pans.
Step-by-step chains that connect related tools for common tasks.
| Pan | Area |
|---|---|
| 8×8 square | 64 |
| 9×13 sheet | 117 |
| 8″ round | 50.3 |
| 9″ round | 63.6 |
| From → To | Factor |
|---|---|
| 9×13 → 8×8 | ×0.547 |
| 8″ → 9″ round | ×1.26 |
| 9×13 → two 9″ rounds | ~×1.09 each |
Scale by **top surface area** — depth affects bake time, not the ratio.
Every ingredient uses the **same** area factor.
If the new pan is deeper, fill only ⅔ full; adjust time instead of overfilling.
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Area ratio 64÷117 ≈ **0.547**. Multiply every ingredient by 0.547 — a bit more than half the original batter.
**New pan area ÷ original pan area** = scale factor. Multiply each ingredient by that factor.
Round uses π×(d/2)²; rectangle uses length×width. Compare areas, then scale.
Yes — thinner or smaller pans bake faster; deeper layers need longer. Start checking 5–10 minutes early.
Pan converter changes **pan size**; Recipe Scaler changes **serving count**. Use both if guests and pan both change.
Two 9″ rounds total ~127 sq in vs 117 for 9×13 — roughly similar; split batter evenly and watch bake time.
Convert cm to inches first (÷2.54), or use Area Converter, then enter inch dimensions here.
This tool scales linearly. For very large jumps, some bakers tweak baking powder slightly — test your recipe.
Fill **⅔ full** for cakes; do not exceed what the pan safely holds even if math says more batter.
9×5 loaf is ~45 sq in vs 117 — factor ≈0.385. You may need to bake remaining batter separately.
Pan dimensions stay on your device — no upload to EverydayTools servers.
Bake times and leavening may need manual tuning for extreme pan changes — always test doneness.
Part of Calculator Tools
More free tools for the same workflow.
Free oven temperature converter: Fahrenheit, Celsius, and UK gas mark for baking — 350°F → 177°C, Gas 4. Runs locally in your browser.
Free recipe scaler: original and new servings → scale factor and ingredient amounts. Double, halve, or custom serving math. Runs locally in your browser.
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Reviewed on 2026-06-27.
Cups or any unit — scaled by area ratio