Baking Guides
Recipe Scaling Calculator: The Two Methods (and When Each One Lies)
Two methods scale a recipe, and using the wrong one wrecks the bake: the multiplier method (multiply everything) and the area method (recompute for the pan). They are not two spellings of the same thing.
Multiplier method: same pan, more batches
Party quantities, two layers from an 8-inch recipe — the pan doesn't change, the batter scales by count. Best for batch-baking or twin pans.
Area method: different pan
6→8 inches is ×1.78, not ×2. 8→9 is ×1.27, not ×1.1. Area goes with the square of diameter — intuition watches the diameter, the math squares it.
Round pan multiplier table
| from \ to | 4" | 5" | 6" | 7" | 8" | 9" | 10" | 12" |
|---|---|---|---|---|---|---|---|---|
| 4" | 1 | 1.56 | 2.25 | 3.06 | 4.00 | 5.06 | 6.25 | 9.00 |
| 5" | 0.64 | 1 | 1.44 | 1.96 | 2.56 | 3.24 | 4.00 | 5.76 |
| 6" | 0.44 | 0.69 | 1 | 1.36 | 1.78 | 2.25 | 2.78 | 4.00 |
| 7" | 0.33 | 0.51 | 0.73 | 1 | 1.31 | 1.65 | 2.04 | 2.94 |
| 8" | 0.25 | 0.39 | 0.56 | 0.77 | 1 | 1.27 | 1.56 | 2.25 |
| 9" | 0.20 | 0.31 | 0.44 | 0.60 | 0.79 | 1 | 1.23 | 1.78 |
| 10" | 0.16 | 0.25 | 0.36 | 0.49 | 0.64 | 0.81 | 1 | 1.44 |
| 12" | 0.11 | 0.17 | 0.25 | 0.34 | 0.44 | 0.56 | 0.69 | 1 |
What doesn't scale linearly
- Eggs: ×1.78 turns 3 eggs into 5.3 — beat one and weigh (a large egg ≈ 50 g out of shell).
- Baking powder/soda: at big scale-ups, scale to ×0.8–0.9 — excess leavening collapses. Within one pan size, multiply straight.
- Salt/spices: add at a 0.8 discount when scaling up, then taste — perceived intensity grows with concentration.
- Liquids: multiply eggs and dairy straight; at multipliers ≥×2.5 hold back 10% of the liquid and add as needed (flour absorption varies).
Which method, when
| Situation | Method | Why |
|---|---|---|
| Double batch, same pan | multiplier | pan unchanged, scale by count |
| 6" recipe, 8" pan | area | pan changed, recompute |
| Round recipe, square pan | area (equal-area) | different area formulas |
| Commercial volume | multiplier + leavening discount | handle non-linear items apart |
Bake Scaler (by Xin He Jia) has both built in: shape-based area math (11 shapes, any-to-any) and by-total-volume scaling, applied to every ingredient with whole-egg suggestions. 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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