Baker’s percentages are the universal language of bread formulas. Every serious bread book uses them. Every professional bakery operates on them. And once you understand the system, you can read any formula at a glance, scale it to any size, and instantly compare one recipe to another.
The system is simple: all ingredients are expressed as a percentage of total flour weight. Flour is always 100%. Everything else is relative to that.
How It Works
In baker’s percentages, flour is the constant. It’s always 100%, regardless of how much flour you’re using. Every other ingredient is expressed as a percentage of that flour weight.
A basic lean bread formula:
| Ingredient | Baker’s % | For 1000g flour | For 500g flour |
|---|---|---|---|
| Flour | 100% | 1000g | 500g |
| Water | 72% | 720g | 360g |
| Salt | 2% | 20g | 10g |
| Instant yeast | 0.8% | 8g | 4g |
The percentages stay the same regardless of batch size. That’s the point. Whether you’re making one loaf or fifty, the ratios are identical. “72% hydration, 2% salt, 0.8% yeast” tells you everything about the dough’s character without knowing the batch size.
Hamelman: “This is the most efficient and practical way to express bread formulas, as it allows the baker to instantly scale any recipe and to compare formulas across different yield sizes.”
Why Percentages, Not Cups
All five major bread authors — Hamelman, Robertson, Forkish, Reinhart, Buehler — insist on weight measurements. Volume measurements are wildly inconsistent: a cup of flour can weigh anywhere from 112g (sifted) to 150g+ (packed) depending on how you scoop.
Hamelman: “How I wish every baker would become comfortable working exclusively in grams!”
Forkish: “Being off by as little as 20 or 30 grams can make a big difference in the consistency of the dough.”
Baker’s percentages make weight measurements intuitive. You don’t memorize grams — you memorize relationships. “72% hydration” is the dough character, and you can calculate the actual water weight in seconds for any flour amount.
Quick conversion references (Buehler, Forkish):
- 1 cup sifted flour = 112g (sifted) / about 135g (scoop method)
- 1 tsp instant yeast = 4g
- 1 tsp salt = 6g
- 1 tbsp water = 14g
- 1 cup water = 224g
These conversions are useful when adapting cup-based recipes to weight. But once you’re working in baker’s percentages, you’ll rarely need them. A good kitchen scale is the only tool you need.
Multiple Flours
When a formula uses more than one flour, the combined weight of all flours equals 100%. Each individual flour’s percentage represents its share of the total.
A whole wheat country bread:
| Ingredient | Baker’s % | For 1000g total flour |
|---|---|---|
| Bread flour | 85% | 850g |
| Whole wheat flour | 15% | 150g |
| Total flour | 100% | 1000g |
| Water | 78% | 780g |
| Salt | 2% | 20g |
| Levain | 15% | 150g |
The individual flour percentages (85% + 15%) always sum to 100%. Water, salt, and every other ingredient are calculated from the total flour weight (1000g), not from any individual flour.
This system makes it easy to adjust flour blends. Want to increase the whole wheat to 25%? Change it to 25%, reduce the bread flour to 75%, and recalculate everything based on the same total flour weight. The hydration, salt, and yeast percentages stay the same — though you may want to increase hydration to compensate for whole wheat’s higher water absorption.
Pre-Fermented Flour (PFF)
PFF is the percentage of total flour that goes through a pre-ferment (poolish, biga, pate fermentee, levain) before the final mix. It tells you how much of the flour’s fermentation happened in advance.
Calculation: PFF = (flour in pre-ferment / total flour in formula) x 100
For example, a formula uses 1000g total flour. The poolish contains 300g of that flour. PFF = 300/1000 x 100 = 30%.
Why PFF matters (Hamelman):
- Higher PFF = more complex flavor (more time for acid, ester, and alcohol development)
- Higher PFF = faster final fermentation (because much of the flour is already partially fermented)
- Typical ranges: 10-20% for levain breads, 20-50% for yeasted pre-ferments
This concept becomes essential when you’re adapting formulas. If a recipe says “use 200g of starter,” you need to know what that starter contains (how much flour and water) to calculate the PFF and to accurately determine the total flour and total water in the formula.
Scaling: The Practical Payoff
The biggest practical advantage of baker’s percentages is scaling. To make any batch size:
- Decide how much flour you want to use (or how many loaves you want)
- Multiply each percentage by your flour weight
- Done
Example: You want to scale the lean bread formula above to 750g of flour.
| Ingredient | Baker’s % | Calculation | Weight |
|---|---|---|---|
| Flour | 100% | 750 x 1.00 | 750g |
| Water | 72% | 750 x 0.72 | 540g |
| Salt | 2% | 750 x 0.02 | 15g |
| Instant yeast | 0.8% | 750 x 0.008 | 6g |
No guesswork. No recipe hunting. The same formula, perfect proportions, at any size.
The total yield percentage is the sum of all ingredient percentages. In the lean bread formula: 100 + 72 + 2 + 0.8 = 174.8%. This tells you the approximate total dough weight relative to flour weight. For 750g flour: 750 x 1.748 = 1311g total dough. Useful for knowing how many loaves you’ll get.
Reading Other People’s Formulas
Once you can read baker’s percentages, you can evaluate any bread formula instantly:
Hydration tells you the dough’s character. 65% = firm and smooth. 72% = standard artisan. 80% = wet and slack. (Hydration guide for the full spectrum.)
Salt has a narrow standard range. Hamelman recommends 1.8-2%. Forkish runs slightly higher at 2.1-2.2%. Robertson uses 2% consistently. If you see a formula with 1% salt, expect fast fermentation and weak gluten. Above 2.5%, expect tight dough and noticeably salty bread.
| Salt % | Effect |
|---|---|
| 0% | Very fast fermentation; weak gluten; bland |
| 1% | Some structure; still fast |
| 2% | Standard; good development; proper rate |
| 2.5%+ | Noticeably tight; slowed fermentation; can taste salty |
Yeast percentage tells you the fermentation timeline. 0.08% = 12-14 hour overnight ferment (Forkish’s Overnight White). 0.5% = 4-6 hours. 1%+ = 1-2 hours. Less yeast means more time, which means more flavor.
Fat and sugar percentages tell you whether the bread is lean or enriched. Brioche at 50% butter is extremely rich. Challah at 8% oil is moderately enriched. A baguette at 0% fat is fully lean.
Common Percentage Ranges
| Ingredient | Typical Range | Notes |
|---|---|---|
| Water | 55-85% | Defines dough character; see hydration spectrum |
| Salt | 1.8-2.2% | Narrow range; most authors use 2% |
| Instant yeast | 0.08-1.5% | Lower = longer ferment = more flavor |
| Fresh yeast | 0.25-5% | Multiply instant x 3 for fresh equivalent |
| Butter/oil | 0-50% | 0% lean; 5-10% moderately enriched; 50% brioche |
| Eggs | 0-50% | Higher = richer, more tender crumb |
| Sugar/honey | 0-12% | Above 10%, use osmotolerant yeast |
| Levain | 10-30% | Percentage of total dough weight, not flour |
Converting Recipes to Baker’s Percentages
Many home recipes are written in cups and tablespoons. Converting them to baker’s percentages:
- Convert all ingredients to grams by weight
- Find the total flour weight (add all flours together)
- Divide each ingredient’s weight by total flour weight
- Multiply by 100
Example: A recipe calls for 3 cups flour (about 405g), 1.25 cups water (about 280g), 1.5 tsp salt (9g), and 1 tsp instant yeast (4g).
| Ingredient | Weight | Calculation | Baker’s % |
|---|---|---|---|
| Flour | 405g | 405/405 x 100 | 100% |
| Water | 280g | 280/405 x 100 | 69% |
| Salt | 9g | 9/405 x 100 | 2.2% |
| Yeast | 4g | 4/405 x 100 | 1% |
Now you know this recipe: 69% hydration, 2.2% salt, 1% yeast. You can compare it to any other formula, spot if something seems off (too much salt? too much yeast?), and scale it to any size.
Pre-ferment Complications
When a formula includes a pre-ferment, the flour and water in the pre-ferment are part of the total formula. This trips up many bakers.
A poolish-based formula:
Poolish: 300g flour + 300g water + pinch of yeast Final dough: 700g flour + 400g water + 20g salt + 6g instant yeast + all of the poolish
Total flour = 300g (poolish) + 700g (final) = 1000g Total water = 300g (poolish) + 400g (final) = 700g
Actual hydration = 700/1000 x 100 = 70%
If you only looked at the final dough column, you’d calculate 400/700 = 57%. That’s wrong — it ignores the water already in the poolish. Always calculate baker’s percentages from total formula quantities, including what’s in the pre-ferment.
The same principle applies to sourdough levain: a 100% hydration levain at 150g contains roughly 75g flour and 75g water, which must be counted in the total formula.
Why This Matters
Baker’s percentages are not just a professional convention. They’re a thinking tool. Once you internalize the system, you stop following recipes and start reading formulas. You understand why a bread works, not just how to make it.
You see a new recipe and immediately know: “72% hydration, 20% PFF from a poolish, 2% salt — that’s a standard French bread with overnight complexity.” You can predict the dough’s behavior before you mix it. You can diagnose problems by looking at the numbers.
The Baker’s Bench tool calculates baker’s percentages automatically, handles multi-flour formulas, extracts pre-ferment flour and water, and scales to any batch size. But the mental model is worth developing even if you use a calculator. Understanding the language is more valuable than the math.
For a practical application of baker’s percentages in pre-ferment formulas, the pre-ferments guide walks through poolish, biga, and pate fermentee calculations. The desired dough temperature guide shows how baker’s percentages interact with temperature calculations. And if you’re just getting started, the best bread books all teach this system from the ground up.
Frequently Asked Questions
- Why is flour always 100% in baker's percentages?
- Flour is the reference point because it's the dominant ingredient in every bread formula — everything else is proportional to it. Using flour as the baseline means hydration, salt, yeast, and every other ingredient percentage stays constant regardless of batch size. A 72% hydration dough has the same character whether you're making 500g or 5000g of flour. The system wouldn't work as cleanly with any other ingredient as the reference.
- How do I calculate baker's percentages for a recipe written in cups?
- First, convert everything to grams by weight (a kitchen scale is essential). Then divide each ingredient's weight by the total flour weight and multiply by 100. For example, if a recipe uses 405g flour and 280g water: 280 / 405 x 100 = 69% hydration. Once converted, you can compare the formula to known standards, spot errors, and scale to any size.
- Do I include the flour and water in my sourdough starter when calculating percentages?
- Yes. A 100% hydration sourdough starter is roughly half flour and half water by weight. Both must be counted in the total formula. If your formula uses 800g flour in the final dough plus a levain containing 75g flour, total flour is 875g. Ignoring the pre-ferment flour and water produces inaccurate hydration and PFF calculations.
- What does pre-fermented flour (PFF) percentage mean?
- PFF tells you what portion of the total flour went through a pre-ferment before the final mix. Calculate it by dividing the flour in the pre-ferment by total flour, multiplied by 100. Higher PFF means more complex flavor and faster final fermentation. Typical ranges: 10-20% for sourdough levain breads, 20-50% for yeasted pre-ferments like poolish or biga.
- What's a normal salt percentage for bread?
- Professional standard is 1.8-2.2% of flour weight. Hamelman recommends 1.8-2%, Robertson uses 2% consistently, and Forkish uses 2.1-2.2%. Below 1.5%, fermentation runs too fast and gluten is weaker. Above 2.5%, the dough becomes noticeably tight, fermentation slows significantly, and the bread can taste salty.