Baking Guides
Bundt Pan to Loaf Pan Conversion (Ring-Area Math)
Converting a bundt (tube) pan to a round pan, the classic error is treating the outer diameter as the diameter — the chimney eats roughly 15% of the area. A bundt is a ring, not a circle.
The correct math: subtract the chimney
Chimney bore is estimated at 38% of the outer diameter (varies by maker, ±0.1").
Bundt ↔ equal-area round
| Bundt | Equal-area round |
|---|---|
| 6" bundt | ≈ 5.5" round |
| 8" bundt | ≈ 7.4" round |
| 9" bundt | ≈ 8.3" round |
| 10" bundt | ≈ 9.2" round |
| 12" bundt | ≈ 11.1" round |
Feel it: a 10-inch bundt holds like a 9.2-inch round — one size smaller than intuition.
Matching a loaf pan
A standard 900 g / 2 lb loaf (19.6×10.6×11 cm) holds ~2.3 L at 70% fill. A 9–10" bundt recipe (1.4–1.6 L of batter) fits one loaf loosely — use volume (batter ÷ pan volume), not area, because the loaf is much taller.
What must not leave the bundt
- Chiffon / angel food: the chimney is structure — batter climbs it. In a round pan they collapse. Physics, not technique.
- High sugar-fat pound cakes: the chimney halves the thickest heat path; in a round pan the center runs raw far more often.
The reverse (round recipe into a bundt) usually works: multiplier from the table, about −10% time (rings conduct faster).
Bake Scaler (by Xin He Jia): the tube pan is one of 11 shapes — the ring area subtracts the chimney automatically, converting to rounds, squares, loaves. Fully offline, one-time purchase — no ads, no subscription.
Bake Scaler
Scale any recipe to any pan in a second. 11 shapes, multiple pans, whole-egg suggestions, unit guard. One-time purchase, no ads, no subscription, fully offline.
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