Baker's Percentage Calculator

Calculate ingredient weights and percentages using baker's math for consistent bread and dough recipes.

What Is a Baker's Percentage Calculator?

A baker's percentage calculator converts a bread recipe into baker's math, where every ingredient is expressed as a percentage of the total flour weight. This method, also called baker's percentage or baker's math, is the standard formula professional bakers use to scale recipes, adjust hydration, and maintain consistent dough behavior across different batch sizes.

This tool takes your flour weight and ingredient percentages and returns the exact gram weights needed for each ingredient. It also works in reverse: enter ingredient weights to see their baker's percentages.

How Baker's Math Works

In baker's percentage, the total flour weight is always 100%. Every other ingredient is calculated as a percentage of that flour weight. This differs from standard recipes where percentages are based on the total recipe weight.

The Formula

Ingredient Weight = (Ingredient Percentage ÷ 100) × Total Flour Weight

For example, if a recipe calls for 500g of flour and 65% hydration, the water weight is (65 ÷ 100) × 500 = 325g.

Key Rules

Flour is always 100%. If using multiple flours, their combined weight is the 100% base.
Percentages can exceed 100%. High-hydration doughs often have water above 80%, and preferments or inclusions can push totals well past 100%.
Total percentage is not 100%. Unlike standard math, the sum of all ingredient percentages will exceed 100% because flour is the only 100% reference.

How to Use This Calculator

Set your flour weight. Enter the total weight of all flours in grams. This becomes your 100% base.
Add ingredients. For each ingredient, enter its baker's percentage. The calculator will show the required weight in grams.
Adjust as needed. Change any percentage to see how ingredient weights shift. The tool updates in real time.
Reverse calculation. If you have a recipe with weights but no percentages, enter the weights to see the baker's percentages.

Example: Scaling a Sourdough Recipe

You have a sourdough recipe with these baker's percentages:

Bread flour: 100%
Water: 75%
Sourdough starter: 20%
Salt: 2%

You want to make a loaf with 400g of flour. Enter 400g as the flour weight. The calculator returns:

Water: 300g
Starter: 80g
Salt: 8g

Total dough weight: 788g. This is enough for one large loaf or two smaller ones.

Understanding Your Results

The output shows exact gram weights for each ingredient based on your flour weight and percentages. Use these weights directly in your mixing process.

Hydration Percentage

Total hydration is the combined water from all sources (added water, starter water content, milk, etc.) divided by total flour. This number determines dough consistency, fermentation speed, and crumb structure. A 65% hydration dough is firm; 80% is very wet and sticky.

Ingredient Ratios

Baker's percentages make it easy to compare recipes. A recipe with 2% salt and 20% starter will behave predictably whether you're making 500g or 50kg of dough.

Common Mistakes When Using Baker's Percentages

Treating total percentage as 100%. The sum of all percentages will exceed 100%. This is normal and expected.
Forgetting starter or preferment flour. If your starter contains flour and water, those amounts must be included in the total flour and water calculations for accurate hydration.
Using volume measurements. Baker's math requires weight measurements. Volume is inconsistent and will break the percentage system.
Ignoring ingredient moisture. Ingredients like honey, eggs, or milk contain water. For precise hydration, account for their water content.

Limitations and Precision Notes

This calculator assumes all ingredients are measured by weight in grams. It does not account for:

Moisture content variations in flour, butter, or other ingredients
Temperature effects on ingredient density
Absorption differences between flour types (whole wheat absorbs more water than white flour)

For professional precision, adjust hydration based on your specific flour's absorption characteristics. The calculator provides a mathematically accurate starting point, but real-world dough behavior may require minor adjustments.

Practical Use Cases

Scaling recipes. Double or halve any recipe instantly by changing the flour weight.
Comparing recipes. Convert any recipe to baker's percentages to see how it compares to others.
Developing new recipes. Start with target percentages and let the calculator determine weights.
Teaching or learning. Understand how ingredient ratios affect dough behavior by experimenting with percentages.
Consistency in production. Maintain identical dough characteristics across different batch sizes.

Frequently Asked Questions

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

Flour is the structural foundation of bread and dough. Setting it as 100% creates a consistent reference point for all other ingredients. This allows bakers to compare recipes, adjust hydration, and scale batches without recalculating the entire formula.

Can I use baker's percentages with multiple flours?

Yes. The combined weight of all flours is the 100% base. For example, 300g bread flour and 200g whole wheat flour gives a total flour weight of 500g. All other ingredients are percentages of that 500g total.

What does 100% hydration mean?

100% hydration means the water weight equals the flour weight. For 500g of flour, you would use 500g of water. This produces a very wet, slack dough often used for ciabatta or high-hydration sourdough.

How do I account for starter in baker's percentages?

Include both the flour and water from your starter in the total flour and water calculations. If your starter is 100% hydration (equal parts flour and water), a 200g starter contains 100g flour and 100g water. Add these to your recipe's flour and water totals.

Why does my total percentage exceed 100%?

Because flour is the only ingredient set to 100%, all other percentages add on top. A typical bread recipe might total 175–185%. This is correct and expected in baker's math.