Baking Tin Size Calculator — Convert & Scale Tins

Scale recipe by

Example values

×1.32

Area 314 → 415 cm² (+32%) · same depth

Larger tin: batter is shallower. Check 5–10 min early.

Send ×1.32 to Scaler

How this is calculated

The scale factor is the ratio of the tins’ base areas, so the batter ends up the same depth. Add depth to both tins to scale by volume instead.

round π(d/2)² · square s² · loaf l×w · k = A_my ÷ A_recipe (or V_my ÷ V_recipe with depth)

Same-area equivalents: square side = 0.886 × round diameter; round diameter = 1.128 × square side.

Do I need to change the baking time?

A bigger tin with the same batter depth bakes in about the same time; if the batter is shallower, check 5–10 minutes early. Deeper batter needs longer and sometimes a lower oven.