The Beginner’s Guide to Baker’s Percentages for Artisan Bread

The Beginner’s Guide to Baker’s Percentages for Artisan Bread

If you have ever opened a bread recipe written as “500 grams flour, 350 grams water, 10 grams salt, 2 grams yeast” and wondered why anyone would bother with percentages, you are in the right place. Baker’s percentages are not a test of arithmetic. They are a compact language for describing dough. Once it clicks, you can read a formula at a glance, scale it to any size, and change hydration without guessing. You only need a kitchen scale and one simple habit: write everything down.

The first time you see a formula written as “100% flour, 75% water, 2% salt,” it can feel backwards. Where is the total? Why is flour always 100? The answer is that baker’s percentages are not ordinary percentages of the whole dough. They are percentages of the flour, and that single shift in perspective makes the whole system easier to use.

Why Baker’s Percentages Beat Cups and Spoons

Volume measurements work for some kitchens, but bread dough is sensitive to flour and water amounts. A cup of flour can weigh very differently depending on how the baker scoops it. One cup may be 120 grams; another may be 145 grams. That gap is enough to turn a familiar dough into something much wetter or drier. The same is true for water measured in cups, especially when you are trying to fine-tune a dough that already feels a little slack or stiff.

Percentages fix that because they describe relationships, not absolute amounts. A formula at 72% hydration behaves like a 72% hydration formula whether you are making one small loaf or six large ones. You can compare two recipes without doing a full conversion, and you can spot a very wet dough or a heavily salted one before you mix anything. If one formula is 68% water and another is 82%, you know immediately that the second dough will be much looser, even if the ingredient lists look similar at first glance.

This is also why baker’s percentages are so useful for troubleshooting. If a loaf came out dense and you want to know whether the dough was underhydrated, you can check the hydration number rather than guessing from the feel of a single batch. If a bread tastes flat, you can compare the salt percentage with a formula you trust. The numbers give you a place to start the next test.

The One Rule: Flour Is Always 100%

In baker’s math, the total weight of flour is always 100%. Every other ingredient is expressed as a percentage of that flour weight. Water at 75% means 75 grams of water for every 100 grams of flour. Salt at 2% means 2 grams of salt per 100 grams of flour.

If a formula uses more than one flour, add them together first. Suppose you use 400 grams of white flour and 100 grams of whole wheat. Your total flour is 500 grams, and that is 100%. The whole wheat is 20% of the total flour, because 100 divided by 500 is 0.20. Water percentages are then calculated against the full 500 grams, not against the white flour alone.

When you begin using a preferment, count its flour and water in the totals. Otherwise the percentages tell you a story that does not match the dough in your bowl. A sourdough starter, poolish, or biga is not a magic extra ingredient outside the formula. It is flour and water that have already been mixed and fermented, so its components belong in the flour and water columns.

What Counts as Flour?

Any dry flour that goes into the dough counts toward the 100%. That includes white flour, whole wheat flour, rye flour, spelt, and any other grain flour in the mix. It also includes the flour inside a preferment. If you are using a starter at 100% hydration, half its weight is flour and half is water. If your starter is kept at 125% hydration, the split is different, so it is worth knowing your starter’s consistency before you scale a formula.

Ingredients that are not flour do not become part of the 100% base. Salt, yeast, honey, malt, seeds, and oil are all calculated as percentages of the total flour weight. That keeps the base stable and makes formulas easier to compare.

Reading a Simple Bread Formula

A simple white country loaf might be written at 75% hydration, 2% salt, and 0.5% instant yeast. As percentages, it looks like this:

• Flour: 100%
• Water: 75%
• Salt: 2%
• Instant yeast: 0.5%

Add those numbers: 177.5%. That total is not flour or water. It is a ratio sum that lets you scale the formula to any dough weight. If you want 1,000 grams of dough, divide 1,000 by 177.5, then multiply by 100. You get about 563 grams of flour. Water is 563 multiplied by 0.75, or about 422 grams. Salt is 563 multiplied by 0.02, or about 11 grams. Yeast is 563 multiplied by 0.005, or about 3 grams.

That is the whole trick. The percentages stay the same; the gram amounts change with the size of the batch. Once you have done this a few times, you will start to recognize common totals and know roughly what a formula will feel like before you weigh anything.

A baker’s percentage is a relationship, not a recipe size. Change the flour weight and every other number follows.

Scaling Up or Down With a Kitchen Scale

Scaling with a kitchen scale is mostly a matter of order. Keep the formula in front of you and work through the numbers before you open the flour bin.

1. Write down each ingredient and its baker’s percentage.
2. Add the percentages together. For the loaf above, the total is 177.5%.
3. Decide the dough weight you want. Two loaves at 900 grams each means 1,800 grams of dough.
4. Divide the target dough weight by the total percentage, then multiply by 100 to find the flour weight. For 1,800 grams and 177.5%, that is about 1,014 grams of flour.
5. Multiply the flour weight by each percentage: 760 grams water, 20 grams salt, 5 grams yeast.
6. Round to the nearest gram, mix, and note the actual numbers you used.

If you are using a starter, decide whether its flour and water are already included in the formula. Most sourdough formulas list the starter as a separate percentage and count its flour and water in the total flour and water. Read carefully before you scale. A small bookkeeping mistake here can make a dough much wetter than expected.

It also helps to write down the batch size and the final dough weight in your notes. The next time you bake, you can compare what you intended with what you actually mixed. Over time, those notes become more useful than any generic recipe because they describe your flour, your starter, and your kitchen.

Adjusting Hydration Without Wrecking the Dough

Hydration is simply water weight divided by total flour weight. A dough at 65% is firm enough for many sandwich loaves; 75% gives a more open, rustic crumb; 85% is wet and needs confident handling. Those numbers are not rules. They are landmarks. Flour absorbs water differently, and a stone-milled whole wheat flour can drink more water than a refined white flour, while a weak flour may feel wet even at a moderate percentage.

The practical move is to hold back a little water at the start. Mix the dough at a slightly lower hydration, let it rest, and then add the remaining water if the flour is still asking for it. This is especially useful with fresh whole grains, varied bread flours, and old bags of flour that have been sitting in the pantry. You are not changing the formula forever; you are adjusting to the flour in front of you.

Keep the salt percentage steady while you learn. Salt affects flavor, fermentation, and dough strength, and a formula that swings wildly from 1.5% to 3% will be harder to compare. Most artisan breads sit somewhere around 1.8% to 2.5% salt, but the exact number is a style choice. The important thing is to know what you chose.

A Worked Example With a Preferment

Here is a simple sourdough-style formula that shows how preferments fit into baker’s percentages. Suppose you want a total of 500 grams of flour, 75% hydration, 2% salt, and a starter that makes up 20% of the total flour weight.

• Total flour: 500 grams = 100%
• Total water: 375 grams = 75%
• Salt: 10 grams = 2%
• Starter: 100 grams = 20%, at 100% hydration, so it contains about 50 grams flour and 50 grams water

Because the starter already contains 50 grams of flour and 50 grams of water, you mix it with 450 grams of additional flour and 325 grams of additional water. Add the 10 grams of salt, and you have a dough built from 500 grams of total flour and 375 grams of total water. The percentages describe the final dough, not just the ingredients you scoop into the bowl at the end.

This is where many beginners get confused. If you calculate the water percentage from the added water only, you will underestimate the true hydration. If you forget to count the starter’s flour, your total flour will be too low and every other percentage will drift. Write the formula in two columns if it helps: one for total flour and water, and one for what you actually weigh out.

Common Mistakes and Quick Checks

Baker’s percentages are simple, but small errors can make a formula confusing. These are the mistakes that show up most often:

• Using a single flour as the 100% base when the formula uses several flours. Add all flours together first, then calculate.
• Forgetting the flour and water in a preferment. A starter or poolish changes both totals.
• Treating the total percentage as hydration. A total of 177.5% is not water; it is the sum of all the percentages.
• Dividing by the total percentage in the wrong order. Divide the dough weight by the total percentage, then multiply by 100.
• Not recording the actual weights used. Rounding is fine, but note what you did so the next bake is repeatable.

A few quick checks can catch most problems. The total percentage should be above 100% because flour is 100% and the other ingredients add to it. Hydration for most artisan breads falls somewhere between 65% and 85%, though stiffer and wetter styles exist. Salt is usually near 2%. Yeast is often a small fraction of a percent to about 1%, depending on the style and fermentation time. If a number looks far outside those ranges, check whether you used the right base.

Finally, remember that baker’s percentages are a tool for clarity, not a demand for perfect precision. A gram of difference in salt or yeast will not ruin a loaf. A large miscalculation in flour or water will. Once you get comfortable with the one rule that flour is always 100%, the rest of the formula becomes a map you can read, scale, and adjust with confidence.

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