Recipe Scaler

How to Scale Baking Recipes

Scaling a baking recipe seems straightforward — just multiply everything — but baking has quirks that don't scale linearly. While most ingredients scale perfectly (flour, sugar, butter, milk), a few need special attention to avoid flat, dense, or overly risen results.

What Scales Linearly

• Flour, sugar, butter, oil, milk — these scale exactly with the multiplier.
• Salt — scales linearly, but taste-test if going above 3×.
• Vanilla and extracts — scale linearly up to 2×, then add about 75% of the multiplied amount for larger batches (flavors can become overpowering).

What Doesn't Scale Linearly

• Leavening agents (baking powder, baking soda): When doubling, use the full 2× amount. When tripling or more, use only about 2.5× instead of 3×. Too much leavening creates a metallic taste and causes cakes to rise too fast then collapse.
• Eggs: Scale exactly, but if you end up needing a partial egg (like 1.5), use the whole egg. For half an egg, whisk one egg and use half the volume.
• Baking time: A doubled recipe in a larger pan needs more time. A doubled recipe split into two same-size pans needs roughly the same time.

Tips for Scaling Up

• Keep the same pan size — bake in batches rather than overfilling a bigger pan. You'll get more consistent results.
• Measure by weight — scaling is more accurate with grams than cups, especially for flour.
• Don't scale more than 4× — beyond that, mixing becomes uneven and oven performance suffers. For very large batches, it's better to make multiple separate batches.

Scaling Down

Halving a recipe is usually straightforward, but watch for odd egg counts. If a recipe calls for 3 eggs and you're halving it, use 2 eggs (slightly more than 1.5) for better structure. For leavening, use exactly half — precision matters more when scaling down because there's less room for error.