Baker's Percentage Calculator

How baker's percentage works

Every ingredient is compared with total flour weight. Flour is the 100% reference, so a dough with 500 g flour and 375 g water has 75% water. The calculation is 375 divided by 500, then multiplied by 100.

Baker's percentage is different from saying what share of the final dough an ingredient makes up. In a 75% hydration dough, water is not 75% of total dough weight. It weighs 75% as much as the flour.

Formula totals can be greater than 100%. If the formula contains 100% flour, 75% water, 2% salt, and 0.6% yeast, the total is 177.6%. That is normal because all the percentages use flour as their reference.

How to calculate baker's percentage from ingredient weights

Divide each ingredient by total flour and multiply by 100. If you have 500 g flour, 350 g water, 10 g salt, and 5 g yeast, the percentages are 100% flour, 70% water, 2% salt, and 1% yeast.

Example with a simple lean dough

Start with 600 g flour, 420 g water, 12 g salt, and 3 g instant yeast. Water is 420 divided by 600, which gives 70%. Salt is 12 divided by 600, which gives 2%. Yeast is 3 divided by 600, which gives 0.5%.

The gram amount can change while the percentage stays the same. If you double this formula, the ingredients become 1,200 g flour, 840 g water, 24 g salt, and 6 g yeast. The formula is still 70% hydration, 2% salt, and 0.5% yeast.

Why flour is 100 percent in baker's math

Total flour is always the 100% reference. This gives every bread formula a stable base. Whether a batch uses 300 g flour or 30 kg flour, the relationship between water, salt, yeast, fat, sugar, and inclusions can be described in the same way.

This makes baker's math useful for comparing recipes. A 500 g flour loaf and a 2,000 g flour batch may look very different by weight, but if both use 72% water and 2% salt, those two important formula relationships are the same.

Baker's percentage is a formula language, not a score. A higher water percentage is not automatically better. A higher yeast percentage is not automatically wrong. The percentages describe the recipe so you can understand and reproduce it.

How to calculate a flour blend percentage

All flour types together make the 100% flour basis. If a dough uses 400 g bread flour, 75 g whole wheat flour, and 25 g rye flour, total flour is 500 g.

The flour blend is therefore 80% bread flour, 15% whole wheat, and 5% rye. Those flour percentages add to 100%, while water, salt, yeast, and other ingredients are shown separately relative to the same 500 g total flour.

Why flour blend percentages are useful

A flour blend percentage makes the recipe easier to scale. If you later decide to use 1,000 g total flour, you can keep the same blend with 800 g bread flour, 150 g whole wheat, and 50 g rye.

It also makes formulas easier to compare. You can quickly see whether one loaf uses 10% whole wheat and another uses 40%, even when the total batch sizes are different.

Bread hydration as a baker's percentage

Hydration is the liquid contribution relative to total flour. A dough with 500 g flour and 350 g water is 70% hydration. A dough with 500 g flour and 400 g water is 80% hydration.

When sourdough starter or levain is present, true hydration needs the flour and water inside that preferment. The Sourdough Hydration Calculator is designed for that decomposition.

The same hydration can feel different with different flour. Whole wheat, rye, strong bread flour, and lower protein flour can absorb and handle water differently. The percentage stays useful, but it does not replace judging the actual dough.

How to calculate salt percentage in bread

Salt percentage is salt weight divided by total flour weight. For 500 g flour and 10 g salt, the calculation is 10 divided by 500, which equals 2%.

If you increase the flour to 750 g and want to keep 2% salt, multiply 750 by 0.02. The result is 15 g salt. For 1,000 g flour at 2%, use 20 g salt.

Use percentage to preserve the formula when batch size changes. This is easier and more reliable than remembering a separate salt number for every loaf size.

Yeast percentage in bread formulas

Yeast percentage is calculated from total flour in the same way as salt. If a formula has 500 g flour and 3 g instant yeast, yeast is 0.6%. With 1,000 g flour at the same 0.6%, the formula needs 6 g instant yeast.

Very small yeast percentages can produce tiny gram amounts. A long fermentation dough might use less than 1 g in a small batch. Use a scale that can measure tenths of a gram when precision matters.

Do not treat one yeast percentage as correct for every fermentation schedule. Dough temperature, time, sugar, fat, salt, yeast type, and desired fermentation all influence the amount a formula may use. If you need to change yeast type, use the Yeast Conversion Calculator before inserting the result into your formula.

How to build a bread formula from percentages

Choose total flour first when you already know how much flour you want to use. If total flour is 500 g and the formula is 72% water, 2% salt, and 0.7% yeast, water is 360 g, salt is 10 g, and yeast is 3.5 g.

Each ingredient comes from total flour multiplied by its percentage as a decimal. This makes it easy to create a new batch from a formula without starting from another recipe's gram amounts.

Example formula from 800 g flour

At 75% hydration, use 600 g water. At 2% salt, use 16 g salt. At 0.5% instant yeast, use 4 g yeast. The formula remains 100% flour, 75% water, 2% salt, and 0.5% yeast regardless of whether you make one loaf or several.

How to calculate target dough weight

Target dough weight lets you work backward from the amount of dough you need. Add every formula percentage, convert the total to a decimal, and divide the target dough weight by that value. The result is the flour basis.

Suppose the formula is 100% flour, 72% water, 2% salt, and 0.7% yeast. Total formula percentage is 174.7%, or 1.747 as a decimal. For 1,000 g target dough, divide 1,000 by 1.747. Total flour is about 572.4 g.

Water is about 412.1 g, salt is about 11.4 g, and yeast is about 4 g. Small rounding differences can occur, but the formula stays very close to the 1,000 g target.

Target dough weight is useful for planned loaf sizes. If you need three 850 g loaves, the target dough is 2,550 g before any handling allowance. Baker's math can then calculate every ingredient from the same percentages.

How to scale a bread formula up or down

Keep the baker's percentages fixed and change the flour or dough target. That is the main advantage of formula based scaling. You do not need to recalculate ratios by hand every time the batch changes.

If a formula uses 70% hydration and 2% salt, those percentages remain 70% and 2% whether total flour is 300 g, 800 g, or 5 kg. Only the ingredient weights change.

Use baker's percentage for bread and the Recipe Scaling Calculator for general recipes. A cake, sauce, casserole, or cookie recipe may be easier to scale from servings or yield. Bread formulas gain extra value from flour based percentages because hydration and salt are central attributes.

How inclusions, sugar, and fat fit into baker's percentage

Nuts, seeds, cheese, dried fruit, sugar, butter, and oil can all be shown as percentages of flour. If a formula has 500 g flour and 100 g walnuts, the walnut inclusion is 20%.

If the same formula has 50 g olive oil, oil is 10%. If it has 75 g sugar, sugar is 15%. These percentages make it easy to change batch size while keeping the same flavor and texture relationships.

Inclusions can make the total formula percentage much higher than 100%. That is expected. A dough with 100% flour, 75% water, 2% salt, and 20% walnuts totals 197%.

Sourdough starter and baker's percentage

Starter can be shown as one ingredient, but full formula analysis should also account for the flour and water inside it. A 100 g starter at 100% hydration contains 50 g flour and 50 g water.

If you ignore those internal amounts, the displayed dough hydration and total flour basis can be misleading. This is why professional sourdough formulas often separate total formula, levain build, and final dough.

Prefermented flour is more precise than a vague starter percentage. It tells you how much of the total flour fermented inside the levain before the final mix. This metric still makes sense when starter hydration changes.

Common baker's math mistakes

Treating percentages as shares of total dough

Baker's percentages are relative to flour, not to final dough weight. A 75% hydration formula does not mean the finished dough is 75% water.

Using one flour as the basis in a flour blend

Add all flour types before calculating percentages. Bread flour, whole wheat, rye, spelt, and other flour in the formula all contribute to the total flour basis.

Rounding tiny ingredients to zero

If the formula needs 0.4 g yeast, do not round it to 0 g. Use a suitable scale or increase the batch size so the ingredient can be measured accurately.

Ignoring starter flour and water

When true sourdough hydration matters, decompose the starter. A starter is not an ingredient outside the flour and water system.

A practical baker's percentage workflow

1. List every flour

Add the flour weights. That total becomes 100%.

2. Enter water, salt, yeast, and other ingredients

The calculator turns each gram amount into a percentage of flour. This gives you a normalized formula you can compare with other bread recipes.

3. Check hydration and flour blend

Review the water percentage and the shares of each flour. If starter is present, include its flour and water for full formula analysis.

4. Choose your new batch target

Use total flour if you know how much flour is available. Use target dough weight if you know the number and size of loaves you need.

5. Keep the percentages when you scale

The weights will change, but the formula relationships remain stable. That is what makes baker's math useful for repeatable bread production.

Questions about baker's percentages

Sources and methodology

KitchenMathHub keeps exact unit math separate from culinary reference values and estimates. These sources support the data or conventions used on this page.