Baker's Percentage for Any Loaf
Last reviewed: January 2026
A bread hydration calculator computes the water-to-flour ratio in a bread recipe, expressed as a percentage known as baker's percentage. Hydration levels affect crumb structure, crust, and texture — lower hydration (60%) produces denser bread while higher hydration (75%+) yields open, airy crumbs.
Baker's percentage expresses all ingredients as a percentage of total flour weight. Flour is always 100%. A 75% hydration loaf means 375g water per 500g flour. Typical hydration ranges: Sandwich bread: 60–65%. Sourdough: 70–80%. Ciabatta: 80–90%+. Higher hydration creates more open crumb (bigger holes) but is harder to handle. Start at 70% and work up as your technique improves. Note that different flours absorb different amounts — whole wheat and rye absorb more than white flour at the same hydration percentage.
| Hydration % | Dough Type | Handling | Typical Breads |
|---|---|---|---|
| 50–57% | Stiff | Very easy to shape | Bagels, pretzels |
| 58–65% | Standard | Easy to handle | Sandwich bread, rolls |
| 66–72% | Medium | Slightly sticky | French bread, baguettes |
| 73–80% | Wet | Sticky, needs technique | Ciabatta, sourdough |
| 80–100% | Very wet | Difficult, pour-like | Focaccia, pan breads |
Baker's percentages express every ingredient as a percentage of the total flour weight, not as a percentage of the total recipe. If a recipe uses 1,000 grams of flour and 700 grams of water, the hydration is 70% — regardless of the amounts of salt, yeast, or other ingredients. This system allows bakers to scale recipes to any batch size while maintaining the same proportions and to compare recipes regardless of their total volume. A professional bakery producing 200 loaves uses the same baker's percentages as a home baker making two loaves — only the multiplier changes.
Flour is always 100% in baker's percentages because it is the reference point. Salt typically ranges from 1.8% to 2.2% (higher salt strengthens gluten and slows fermentation). Yeast ranges from 0.5% to 2% for commercial yeast, with lower amounts used for longer fermentation times that develop more flavor. Fat (butter, oil) ranges from 0% in lean doughs like baguettes to 20%+ in enriched doughs like brioche. Sugar ranges from 0% in artisan bread to 15%+ in sweet doughs like cinnamon rolls. Every ingredient's percentage is relative to flour, making it immediately clear how ingredient ratios compare across different recipes.
Hydration level is the single most influential factor in determining a bread's crumb structure, crust character, and handling properties. Low hydration doughs (55-65%) produce tight, uniform crumbs suitable for sandwich bread, bagels, and pretzels. These doughs are stiff and easy to shape but require more kneading to develop gluten. Medium hydration (65-75%) is the sweet spot for most artisan breads — enough water for an open crumb with irregular holes, but firm enough to hold shape during proofing and baking. High hydration doughs (75-90%) produce the large, irregular holes prized in ciabatta and focaccia but are extremely sticky and difficult to handle without experience and proper technique.
The type of flour significantly interacts with hydration. Bread flour (12-14% protein) absorbs more water than all-purpose flour (10-12% protein) because protein (gluten) is hydrophilic. A recipe at 75% hydration with bread flour produces a manageable dough, while the same hydration with all-purpose flour creates a much slacker, stickier dough. Whole wheat flour absorbs even more water because the bran particles are sharp and absorbent, so whole wheat recipes typically require 5-10% higher hydration than white flour recipes to achieve the same dough consistency. Rye flour has different proteins that do not form gluten networks, making high-hydration rye doughs behave very differently from wheat doughs at the same hydration level.
Water enables the enzymatic activity that drives fermentation. In wetter doughs, enzymes (amylase and protease) move more freely, breaking down starches into sugars and relaxing protein bonds more quickly. This is why high-hydration doughs ferment faster than stiff doughs at the same temperature and yeast concentration. A baguette dough at 68% hydration might need 2 hours of bulk fermentation, while a ciabatta at 80% hydration with identical flour and yeast could be ready in 90 minutes. Temperature compounds this effect: a 10°F increase roughly doubles fermentation speed, and this acceleration is more pronounced in wetter doughs where enzymatic reactions are less constrained.
Autolyse — resting flour and water together for 20-60 minutes before adding salt and leavening — takes advantage of hydration-driven enzymatic activity. During autolyse, flour fully absorbs the water, enzymes begin breaking down starches, and gluten bonds start forming passively. The result is a more extensible dough that requires less mechanical kneading, produces better oven spring, and develops more complex flavor through longer enzymatic activity. Autolyse is most beneficial for medium-to-high hydration doughs and has little effect on very stiff doughs where water availability limits enzymatic action.
| Bread Type | Hydration % | Crumb Character | Difficulty |
|---|---|---|---|
| Bagels | 55-60% | Dense, chewy, tight crumb | Easy to shape |
| Sandwich Bread | 60-65% | Soft, uniform, fine crumb | Beginner-friendly |
| French Baguette | 65-70% | Open, irregular, crisp crust | Moderate |
| Sourdough Boule | 70-78% | Large holes, chewy, tangy | Intermediate |
| Ciabatta | 75-85% | Very open, large holes, flat | Advanced |
| Focaccia | 80-90% | Airy, olive-oil enriched | Advanced (but forgiving) |
These ranges are guidelines rather than rules — the optimal hydration depends on your specific flour, environment, and technique. Humidity in your kitchen adds moisture to exposed dough, so bakers in humid climates often reduce hydration by 2-3% compared to published recipes. Conversely, dry environments (common at high altitude) may require increasing hydration by a similar margin. Professional bakers track ambient humidity and temperature and adjust formulas daily, treating recipes as starting points rather than fixed instructions. Home bakers benefit from keeping a baking journal that records hydration, flour brand, ambient conditions, and results to develop calibrated formulas for their specific environment and equipment.
The most common mistake with high-hydration doughs is adding flour when the dough feels too sticky. Sticky is expected — the dough should cling to your hands initially. Instead of adding flour, use wet hands and a bench scraper, and rely on stretch-and-fold techniques during bulk fermentation to build structure without kneading. Each set of folds (typically 4-6 sets spaced 30 minutes apart) increases the dough's strength and reduces stickiness as the gluten network develops. By the end of bulk fermentation, a properly developed high-hydration dough should hold its shape when gently pulled, even though it remains soft and slightly tacky to the touch.
Hydration percentage (water weight ÷ flour weight × 100) fundamentally determines bread texture and handling characteristics. Low hydration (55–65%) produces stiff doughs ideal for bagels, pretzels, and pasta. Standard sandwich bread runs 60–68% hydration. Artisan loaves with open crumb structure (ciabatta, sourdough) use 70–85% hydration, which creates larger air pockets but makes the dough much harder to shape. Ultra-high hydration (85%+) requires special techniques like stretch-and-fold rather than traditional kneading. Whole grain flours absorb more water than white flour, so increase hydration by 5–10% when substituting. Humidity, flour brand, and protein content all affect absorption — treat recipes as starting points and adjust by feel. Scale your recipes proportionally with our Recipe Scaler.
See also: Recipe Scaler · Cooking Measurement Converter · Temperature Converter · Cups to Grams · Grams to Cups
→ Higher hydration doesn't automatically mean better bread. Instagram-worthy open crumb requires high hydration AND strong flour AND proper technique. A 80% hydration dough with weak flour or poor shaping will just be a sticky mess. Master 68% first, then increase gradually.
→ Account for water in your sourdough starter. A 100% hydration starter (equal parts flour and water by weight) contributes equal amounts of flour and water to the recipe. If your recipe calls for 500g flour and 100g starter, the true flour is 550g and true water must include the 50g from the starter.
→ Flour type affects how much water it absorbs. Bread flour absorbs more water than all-purpose. Whole wheat absorbs more than white. Rye absorbs the most. If switching flour types, adjust hydration by 3–5% to maintain similar dough consistency.
→ Baker's math uses weight, never volume. "1 cup of flour" can weigh anywhere from 120–160g depending on how you scoop. Invest in a kitchen scale (even a $10 one) for consistent results. See our Cups to Grams Converter if you only have volume measurements.
See also: Cups to Grams · Cooking Converter · Recipe Scaler · Grams to Cups