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Baker’s Percentage Calculator: Hydration and Ratios

This free baker’s percentage calculator turns the weights of your dough ingredients into percentages of the flour weight. It shows hydration, salt and yeast percentages and can scale the formula to a new flour weight.

By Debmedia Technologies LLP · Kolkata, India · Updated

What Is It and When Do You Need It?

Baker’s percentages make bread formulas easy to compare. Two recipes may look very different in grams, but share the same hydration and salt level. Professionals write formulas this way.

List your ingredients and the flour weights, and read the percentages.

How to Use This Tool

  1. Type one ingredient per line, with grams.
  2. Include every flour (lines beginning with flour).
  3. Optionally enter the flour weight to scale to.
  4. Press Calculate.

How the Calculation Works

All lines whose name contains flour are added to give the flour weight. Each ingredient is divided by that weight and multiplied by 100. Hydration is the water percentage. When you scale, every weight is multiplied by new flour weight ÷ old flour weight.

Worked Example

Flour 500 g, water 350 g, salt 10 g and yeast 5 g is 100%, 70%, 2% and 1%. Scaled to 1,000 g of flour, the weights are 1,000, 700, 20 and 10 g.

Common Uses

  • Bread and pizza dough.
  • Comparing recipes.
  • Scaling batches.
  • Learning baking ratios.

Tips and Common Mistakes

  • Weigh everything in grams.
  • Typical bread: 60 to 75% hydration, 2% salt, 0.5 to 1% yeast.
  • Pre-ferments count toward hydration in some systems.

Next, you may need the cups to grams converter, recipe scaler, electricity cost calculator, Ohm’s law calculator.

Everything runs in your browser. Nothing you type is uploaded, stored or sent to any outside service.

Frequently Asked Questions

A way of writing a recipe where every ingredient is a percentage of the flour weight, and the flour is always 100%.
The weight of water as a percentage of the flour. A bread dough at 70% hydration has 700 g of water for 1,000 g of flour.
It lets you compare recipes and scale them up or down without redoing every sum.
Add their weights and give the total as flour, or list them as separate lines starting with flour.

Disclaimer: results are calculated in your browser from the numbers you enter. Check important results before you rely on them for money, health, safety or legal decisions.