Bread Recipe Scaler

How to use the scaler

Enter the recipe ingredients one row at a time: ingredient name, amount, and unit. If you have multiple loaves or batches in the original recipe, enter the total ingredient weights. The scaler will handle the math.

Mark the flour row by clicking the Flour button. This tells the calculator which ingredient is the flour reference point for baker's percentage calculation. Choose your scaling mode: Multiplier to scale by 2, 3, etc.; Loaves to go from 1 loaf to 3; or Total Weight to hit an exact dough weight for your pan or portfolio. Enter your target value and the results update instantly.

If all ingredients are in weight units (grams, ounces, etc.), the calculator shows baker's percentages below the results. Flour always at 100%, everything else expressed as a percentage of flour weight. Useful for understanding your recipe and adjusting on the fly.

Baker's percentage

Baker's percentage (also called baker's math) expresses every ingredient as a percentage of the flour weight. Flour is always 100%. If you use 1000g flour and 650g water, your hydration is 65%. Salt at 20g per 1000g flour is 2 percent.

Why is this universal among professional bakers? Because it's scale-independent. A 65% hydration recipe works identically whether you're making 500g of dough or 50kg. The percentages stay the same. It also lets you reason about dough without thinking about absolute weights. You can describe a dough in terms of its character: "65% hydration, 2% salt, 20% starter" and that description holds true at any batch size.

Scaling is simple in baker's math. Decide on your flour weight, multiply everything by the same factor, and you're done. If you're scaling from a recipe written in baker's percentages, this calculator does the arithmetic instantly. If you have a recipe in regular measurements and want to convert it to baker's percentages, use weight units and the calculator will show them automatically.

Three ways to scale

Multiplier. The simplest mode. Enter your original recipe, then multiply by 2, 3, 5, or any number. All ingredients scale proportionally. Use this when you want to double or triple a recipe you love.

Loaves. Start with a recipe for one loaf, scale to three loaves. The calculator divides your original recipe by its current loaf count (default 1), then multiplies by your target loaf count. Useful if you're working from a blog recipe that says "makes 1 loaf" and you want to bake 4.

Total Weight: Specify an exact target dough weight (say 2000g to fill a banneton, or 1500g for a smaller loaf). The calculator works backwards from your flour and the percentages of every other ingredient to hit that exact total. This is the mode bakers use most often when planning a bake around specific equipment or production targets.

Volume units and why they limit scaling

Many recipes use volume units (cups, tablespoons, teaspoons). The problem: volume measures vary wildly by how you pack the ingredient. A cup of flour can weigh 110g (loosely spooned) to 150g (scooped and packed). That's a 35% difference in the same volume.

Volume-based recipes are imprecise at best. They get even more problematic when you scale them. If you double a recipe by doubling all the volume measures, you're compounding the measurement error. Baker's percentages require weight. They assume you're using a scale, which is why professional bakers always measure by weight.

If you have a recipe in cups and tablespoons, use the Baking Weight Converter to convert each ingredient to grams before scaling. Once in weight, this scaler will work perfectly and show you baker's percentages. Going forward, keep recipes in weight format. You'll scale easily and accurately.

Scaling yeast and leaveners

This scaler uses linear scaling for yeast and starter. If you double the recipe, double the yeast. This works perfectly at 2–3× scale. Beyond that, the relationship breaks down slightly. Yeast doesn't scale linearly because larger batches have more surface area and different fermentation dynamics.

A practical rule of thumb: at 2× recipe size, use 1.8× the yeast (not 2×) to avoid over-fermenting. At 3×, use 2.5× yeast. At 4×, use 3–3.2×. The calculator shows linear scaling as a baseline; if you're scaling beyond 3×, reduce the yeast amount by 5–10% from what it suggests and monitor your fermentation closely.

Sourdough starter scales more forgivingly because the activity is slower and more stable. Linear scaling works well up to 4–5×. Beyond that, you may want to reduce starter percentage slightly (say from 20% to 15–18%) to keep fermentation time reasonable.

Scaling enriched recipes

Enriched doughs (brioche, milk bread, cinnamon rolls) contain butter, eggs, sugar, and milk. These scale linearly for butter, sugar, and milk. Eggs are the tricky ingredient: you can't use 1.7 eggs.

When scaling enriched recipes, round egg count to the nearest whole egg. If a recipe calls for 2 eggs and you're scaling to 1.5×, use either 2 or 3 eggs (2 stays closer proportionally). If the dough feels too dry or too wet after mixing, adjust the milk or water by 10–15g to compensate. Enriched doughs are more forgiving of minor liquid adjustments than lean breads because the fat provides some buffering.

Frequently asked questions

Can I scale a bread recipe that uses cups instead of grams?

You can enter volume units and scale proportionally, but baker's percentages won't be shown because they require weight. Volume measurements vary by how tightly you pack the ingredient, so a scaled-up volume recipe compounds that imprecision. For best results, convert your recipe to grams first using a cups-to-grams converter, then scale here. You'll get exact amounts and baker's percentages.

Does yeast scale linearly with recipe size?

At 2–3× scale, linear yeast scaling works reliably. Beyond that, larger batch fermentation dynamics differ slightly: more mass means more insulation and a slower temperature drop. A practical adjustment: at 2× use about 1.8× the yeast, at 3× use about 2.5×, at 4× use about 3–3.2×. Reduce the calculated yeast by 5–10% when scaling beyond 3× and monitor fermentation visually.

What is the 'Total Weight' scaling mode for?

Total Weight mode lets you specify an exact final dough weight and the calculator works backwards to determine every ingredient. This is useful when you're scaling to fit specific equipment: a banneton that takes 900g, a Pullman pan that needs 1200g, or a Dutch oven with a specific volume. Enter your ingredients, mark the flour, select Total Weight, and type your target. All ingredient amounts adjust to hit that exact total.

How do I handle eggs when scaling an enriched recipe?

Eggs don't divide neatly, so round to the nearest whole egg. If a recipe calls for 2 eggs and you're scaling to 1.5×, use 3 eggs (closer to 3 than to 2 at 1.5×). If you need 2.3 eggs, use 2 and add an extra splash of milk or water to compensate for the missing liquid. Enriched doughs tolerate minor liquid adjustments well because the fat provides some buffering against dryness.

What does baker's percentage tell me about my recipe?

Baker's percentage expresses every ingredient as a percentage of the flour weight (flour = 100%). It makes recipes scale-independent: a 68% hydration dough has the same character whether you're making 600g or 6kg. Common benchmarks: hydration 55–65% = stiff (bagels, pizza), 65–75% = standard bread, 75–85% = high-hydration open crumb. Salt is typically 1.8–2.2%. Starter is 15–25% for most sourdoughs. These percentages describe the dough's character and let you compare any two recipes at a glance.