Why is flour always 100% in baker's percentages?

Flour is the structural backbone of bread -- it provides the gluten network that gives bread its texture and crumb. Making flour 100% means every other ingredient is expressed as a ratio to flour, making the formula portable across any batch size. If you use 500g flour or 5kg flour, the percentages never change -- only the gram weights scale up. This is fundamentally different from standard culinary percentages where the total recipe weight is the base.

What is a good hydration level for beginner bakers?

A hydration of 65-68% is ideal for beginners. This range produces a dough that is workable by hand, holds its shape during shaping and gives a consistent, tight-to-medium crumb. Sourdoughs and artisan loaves at 75-80%+ hydration require wet-dough handling techniques (stretch and fold rather than kneading) and a well-developed starter, making them more challenging for less experienced bakers.

How do I adjust a recipe to change the hydration?

Calculate the current hydration: water weight / flour weight x 100. To change to a new target hydration: new water weight = flour weight x (target hydration / 100). For example, to take a 65% hydration recipe with 500g flour to 70%: new water = 500 x 0.70 = 350g (was 325g). Increase gradually in 2-3% increments to understand how the dough changes.

Baker's Percentage Calculator — Free Hospitality Calculator

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You're scaling a sourdough loaf recipe for a cafe batch. The head baker has given you a formula in baker's percentages, but the flour weight changes every morning. Before mixing, you need to calculate today's exact water, salt and yeast weights from the flour on the scale.

Baker's Percentage Calculator

Baking

Flour (g)

Water (g)

Salt (g)

Yeast (g)

Other ingredients (g)

Ingredient % = (Ingredient weight ÷ Flour weight) × 100 Flour is always 100%. All other ingredients are expressed as a percentage of the flour weight. This makes it easy to scale recipes and compare formulas regardless of batch size.

Reference: King Arthur Baking — Baker's Percentage

ℹ️ Results are estimates for planning purposes. Verify with current standards and a qualified professional.

1 What this calculator does

Calculates baker's percentages for each ingredient relative to the flour weight (which is always 100%). Enter the flour, water, salt, yeast and any other ingredient weight to see each as a baker's percentage and classify the hydration type. Shows total dough weight.

2 Formula & professional reasoning

Baker's percentage = (Ingredient weight / Flour weight) x 100
Flour is always 100% -- all other ingredients are expressed relative to flour weight
Hydration = Water weight / Flour weight x 100
Hydration types: <60% Very stiff (bagels) | 60-70% Medium (sandwich bread) | 70-80% High (ciabatta) | 80%+ Very high (sourdough, baguettes)

Baker's percentages allow a recipe to be scaled to any batch size while keeping ingredient ratios constant. Because flour is the base (100%), all percentages remain unchanged whether you bake 1 loaf or 100 loaves -- you simply multiply each percentage by the new flour weight. This makes baker's percentages the universal language of professional baking. Hydration percentage directly controls dough workability and final crumb structure -- higher hydration produces more open, irregular crumb.

3 Worked examples

⚠️ Illustrative example only — not clinical or professional instruction.

Basic

Simple white bread formula

Given: Flour: 500g | Water: 325g | Salt: 9g | Instant yeast: 4g

Working:

Water%: 325/500 x 100 = 65.0% | Salt%: 9/500 x 100 = 1.8% | Yeast%: 4/500 x 100 = 0.80% | Total dough: 500+325+9+4 = 838g

Answer: 65.0% hydration | Salt 1.8% | Yeast 0.80% | Total dough 838g | Type: Medium hydration (standard bread)

💡 65% hydration is the classic sandwich bread range -- workable by hand, tight crumb. To adjust to 70%: increase water to 500 x 0.70 = 350g.

Standard

Ciabatta -- high hydration dough

Given: Flour: 1,000g | Water: 780g | Salt: 20g | Instant yeast: 3g | Olive oil: 30g

Working:

Water%: 780/1000 x 100 = 78.0% | Salt%: 20/1000 x 100 = 2.0% | Yeast%: 3/1000 x 100 = 0.30% | Other (oil)%: 30/1000 x 100 = 3.0% | Total: 1,833g

Answer: 78.0% hydration | Salt 2.0% | Yeast 0.30% | Total dough 1,833g | Type: High hydration (open crumb)

💡 0.30% yeast on a 78% hydration ciabatta is intentionally low for a long slow ferment -- higher hydration accelerates fermentation so less yeast is needed.

Advanced

Scaling a formula to a different flour weight

Given: Original: 500g flour at 70% hydration | Scale to: 2,200g flour

Working:

Scale factor: 2,200/500 = 4.4x | New water: 500 x 0.70 x 4.4 = 1,540g | Original salt 1.8%: 2,200 x 0.018 = 39.6g | Original yeast 0.80%: 2,200 x 0.008 = 17.6g

Answer: Scaled batch: Flour 2,200g | Water 1,540g | Salt 39.6g | Yeast 17.6g | Total dough 3,797g

💡 Baker's percentages scale perfectly -- no rounding errors accumulate because each ingredient is calculated directly from the new flour weight.

4 Sanity check

Flour is always 100%

All other ingredients are expressed as a % of the flour weight -- salt at 2% on 1kg flour = 20g regardless of batch size

Salt range for bread

1.8-2.2% of flour weight is standard | Below 1.5%: flat flavour | Above 2.5%: inhibits yeast and oversalts

Instant yeast range

0.2-1.5% of flour | Less yeast = longer, more complex ferment | More yeast = faster but flatter flavour

Total dough weight check

Sum of all ingredient weights = total dough weight | Useful for portioning loaves before baking

5 Common errors

Error	Cause	Consequence	Fix
Using total recipe weight instead of flour weight as the base	Treating baker's % like standard cooking percentage	All percentages wrong -- cannot compare to or scale from professional recipes	Flour is always the denominator. Baker's percentage = (ingredient / flour) x 100. Not (ingredient / total dough) x 100.
Forgetting to adjust leavening agents when scaling large batches	Scaling yeast proportionally for very large batches	Over-leavened bread with off flavour at very large scales -- yeast becomes less efficient at very high quantities	For batches over 10kg flour, reduce yeast percentage slightly (use 0.6-0.7% instead of 0.8-1.0%). Enzyme activity and dough temperature management become more critical at large scale.
Calculating hydration without including all liquid ingredients	Counting water but forgetting milk, eggs or oil	Actual dough much softer than the calculated hydration suggests	All liquids contribute to effective hydration. Milk, buttermilk and eggs are approximately 90% water by weight. Add them to the water weight before calculating hydration.
Applying baker's percentage to non-flour bases	Using the formula for recipes based on sugar, chocolate or other bases	Wrong percentages -- unworkable formula	Baker's percentage applies to bread and pastry recipes where flour is the structural base. For confectionery recipes based on chocolate, sugar or cream, standard weight-for-weight percentages apply.