Explanation
Every ingredient as a share of flour
Bakers write recipes as percentages of flour weight. Flour is always 100%, and 65% water means 65 g of water for every 100 g of flour. Use it to read a recipe's hydration, scale a dough to any size, or work out how much flour pairs with a known ingredient.
p = m ÷ F × 100
| p | Baker's percentage (%) |
|---|---|
| m | Ingredient (g) |
| F | Flour (g) |
325 g of water with 500 g of flour
| Ingredient | 325 |
|---|---|
| Flour | 500 |
| Result | 65% |
p = m ÷ F × 100 = 325 g ÷ 500 g × 100 = 65%
m = F × p ÷ 100
| m | Ingredient weight (g) |
|---|---|
| F | Flour (g) |
| p | Baker's percentage (%) |
Water for 500 g of flour at 65% hydration
| Flour | 500 |
|---|---|
| Baker's percentage | 65 |
| Result | 325 g |
m = F × p ÷ 100 = 500 g × 65 ÷ 100 = 325 g
F = m × 100 ÷ p
| F | Flour weight (g) |
|---|---|
| m | Ingredient (g) |
| p | Baker's percentage (%) |
Flour to pair with 325 g of water at 65%
| Ingredient | 325 |
|---|---|
| Baker's percentage | 65 |
| Result | 500 g |
F = m × 100 ÷ p = 325 g × 100 ÷ 65 = 500 g
Diagram of this result
Two bars on one scale: flour is the 100% reference and the ingredient bar is its baker's percentage of that length. Percentages above 100 draw a bar longer than the flour.
The weights and the percentage in the diagram are the same numbers stated in the answer and the steps.
Common mistakes
Baker's percentages do not add up to 100%. A dough with 500 g flour and 325 g water is 65% hydration, not 65% of the dough. Weigh everything in grams; cups make the ratios unreliable. When a recipe uses two flours, add them together as the 100%.
Assumptions and limits
Flour must be more than zero. Ingredient weights and percentages may be zero, except that finding flour needs a percentage above zero. Percentages above 100% are valid. Hydration here counts only the water you add, not the moisture already inside flour, eggs or milk.
What are typical baker's percentages?
A basic bread dough is often around 60 to 75% water, 2% salt and 1 to 2% instant yeast. Ciabatta can reach 80% water or more, while bagels sit closer to 55%.
Sources
Measurement conventions: NIST SP 811, https://www.nist.gov/pml/special-publication-811. The baker's percentage convention follows standard professional baking practice.