Bread Baking Calculator: Hydration Ratios and Baker's Percentages Explained
Calculate bread dough hydration percentages, scale recipes using baker's math, and find the right water-to-flour ratio for any bread style.
Baker's math is one of those things that seems unnecessarily complicated until suddenly it's the most sensible thing in the kitchen. Once you understand baker's percentages, you can scale any bread recipe to any size, compare recipes at a glance, and understand exactly why a sourdough and a ciabatta feel so different in your hands. The CalcHub Bread Baking Calculator handles all the baker's percentage math so you can focus on the actual baking.
What Is Baker's Percentage?
In baker's math, all ingredients are expressed as a percentage of the flour weight — not as a fraction of total recipe weight or volume. Flour is always 100%.
So if a recipe uses 500g flour and 350g water:
- Hydration = 350 ÷ 500 × 100 = 70%
- Salt at 10g = 10 ÷ 500 × 100 = 2%
- Yeast at 5g = 5 ÷ 500 × 100 = 1%
This means you can immediately see the recipe's character from the percentages alone, and scaling becomes trivial.
Hydration Levels by Bread Type
| Bread Style | Hydration % | Dough Feel |
|---|---|---|
| Bagels | 55–58% | Very stiff, easy to shape |
| Sandwich bread | 60–65% | Smooth, firm, workable |
| Baguette | 65–70% | Soft but holdable |
| Sourdough (country loaf) | 70–80% | Tacky, requires techniques |
| Ciabatta | 75–85% | Wet, shaggy, sticky |
| Focaccia | 75–85% | Pourable almost |
| No-knead rustic loaf | 75–80% | Minimal handling |
Scaling with Baker's Math
Say a recipe calls for 500g flour and you want to make it with 750g flour:
| Ingredient | Original (500g flour) | Scaled (750g flour) |
|---|---|---|
| Flour | 500g (100%) | 750g |
| Water at 72% | 360g | 540g |
| Salt at 2% | 10g | 15g |
| Sourdough starter at 20% | 100g | 150g |
| Olive oil at 3% | 15g | 22.5g |
Standard Bread Formula
A reliable everyday loaf formula:
| Ingredient | Baker's % | For 500g Flour |
|---|---|---|
| Flour | 100% | 500g |
| Water | 70% | 350g |
| Salt | 2% | 10g |
| Instant yeast | 0.5–1% | 2.5–5g |
| Olive oil (optional) | 2–5% | 10–25g |
Sourdough Hydration Tips
For sourdough, your starter contributes flour and water to the final dough. If you're using a 100% hydration starter (equal parts flour and water by weight), half of its weight is flour and half is water — factor this into your overall hydration calculation. The calculator handles starter contributions automatically when you specify starter hydration.
What if my dough feels wrong even with the right percentages?
Flour brands and types absorb water differently. Even different bags of the same flour can vary. Add liquid gradually in the last 5–10% and assess texture rather than adding it all at once.
Is baker's percentage used for pastry too?
For bread and lean doughs, yes. Enriched doughs (brioche, croissants) also use it but with butter and eggs as additional major percentage components. The calculator handles enriched doughs too.
Why do my loaves come out flat at high hydration?
High-hydration doughs need either more strength-building (stretch and folds during bulk ferment) or a Dutch oven for baking support. The oven spring also depends on proper fermentation — both under- and over-proofed doughs bake flat.
Related Calculators
- Recipe Scaler Calculator — General recipe scaling before converting to baker's math
- Baking Substitution Calculator — Substitute flour types while maintaining correct ratios
- Food Cost Calculator — Calculate cost per loaf when baking in volume