What Are Baker's Percentages? Clear Guide for Beginners

Understand baker's percentages (Bäckerprozente): how to read recipes, scale dough, and control hydration and salt precisely.

What to Expect

You will learn to read any bread formula, scale recipes reliably, and control hydration, salt and starter percentages so your bakes become predictable.

What you'll learn:

  • ✓ What baker's percentages mean and why flour = 100%
  • ✓ How to calculate hydration and other ingredients as percentages
  • ✓ How to scale a recipe up or down accurately

💭 Expect a small learning curve — once you practice a few conversions on your [kitchen scale](https://amzn.to/4pUMVHi) the method becomes faster than guessing.

What You Need

Must have:

Kitchen scale

Accurate to the gram; must be used for every calculation

⚠️ Buy a scale — working with percentages without weighing is unreliable

Basic math (percentages)

Comfortable with multiplication/division

⚠️ Use a spreadsheet or calculator → more

Glass jar for starter

Helpful when measuring starter weight and activity

⚠️ Any clear container works

Nice to have:

Why learn baker's percentages?

Universal language

Recipes using baker's percentages are independent of loaf size — professional bakers and many online recipes use them [1]

Control hydration

Hydration is simply (water ÷ total flour) × 100 — you can test how dough handles at 65% vs 75% hydration and reproduce results [1][2]

Adjust salt and starter reliably

Salt and starter expressed as % of flour let you fine-tune flavor and fermentation without guessing

Accurate scaling

Want two loaves or half a loaf? Percentages let you scale each ingredient precisely

Ingredients

For: Concepts and examples

Flour (base) Always set to 100% Total flour is the denominator for every other ingredient
Water Expressed as % of flour (hydration) Example: 65% hydration means 65g water per 100g flour
Starter Expressed as % of total flour If using 20% starter with 500g flour, starter = 100g
Salt Commonly 2% (range 1.8–2.5%) 2% of flour gives predictable seasoning and dough strength
Other flours (rye, whole) Each counted as flour toward 100% If recipe has 400g strong flour + 100g rye, total flour = 500g

Step by Step

Set flour = 100% → compute each ingredient → convert percentages to grams for your chosen total flour weight

1

Pick the formula and identify base

Find the recipe expressed in baker's percentages. Confirm total flour is the base (100%). Beginners should practice with simple formulas from trusted sources [1].

✓ You can point to the line that says 100% (flour)
💡 If recipe lists multiple flours, add them to get total flour
2

Decide total flour weight

Choose how much total flour you want for the bake (e.g., 500g). Weigh on your kitchen scale.

✓ Scale reads chosen flour weight exactly
💡 A typical home loaf uses 400–600g total flour
3

Convert each percentage to grams

Multiply total flour weight by each ingredient % and divide by 100. Example: water 65% → 500 × 65 / 100 = 325g water.

✓ All ingredient gram values are calculated
💡 Use a spreadsheet or calculator for speed
4

Special case — starter

If starter is given as % it counts like an ingredient. For a 20% starter on 500g flour: starter = 100g. Remember starter itself contains flour and water — some farmers subtract starter's flour/water from totals (read the recipe notes) [2].

✓ You know whether the recipe treats starter as part of total flour or as additional ingredient
💡 When in doubt, follow the recipe author's notes; many English sources explicitly state how they count starter [1][2]
5

Check hydration with starter present

If starter is 100% hydration (equal flour and water), it contributes 50% flour and 50% water of its weight. Adjust the formula if the recipe expects this accounting.

✓ Calculated dough hydration matches recipe intention
💡 Common mistake: ignoring starter composition changes effective hydration
6

Scale up/down

To scale, change total flour weight and recalculate every ingredient using the same percentages.

✓ New ingredient weights computed accurately
💡 When scaling a lot, also consider fermentation time adjustments and container size (use a larger large mixing bowl or Dutch oven as needed)

What If It Doesn't Work?

Common mistakes and how to avoid them:

Counting flours incorrectly

Likely: Not summing multiple flours to get total flour (=100%)

Fix: Add all flours first; compute percentages from the total

Ignoring starter composition

Likely: Treating starter weight as pure flour or pure water

Fix: Ask whether starter is included in flour totals; if starter is 100% hydration, split it into flour and water parts when needed [2]

Hydration feels wrong

Likely: Different flour absorption or climate

Fix: Adjust hydration by a few percent and keep notes. Strong wholegrain flours often need more water [1]

Rounding errors

Likely: Rounding grams too aggressively

Fix: Round sensibly (nearest gram). Use a [digital kitchen scale](https://amzn.to/4pUMVHi) with tare to reduce errors

💪 Mastering baker's percentages removes guesswork — once you practice a few conversions you'll be able to reproduce and adapt recipes reliably.

Practical exercises

Ready to practice
→ Take a simple recipe and convert it to grams for 500g total flour using baker's percentages
Want to understand starter details
→ Read about how starter hydration affects formulas
Want to learn why percentages matter biologically
→ Learn about fermentation rates and dough temperature

Sources

  1. [1]
    The Perfect Loaf – The Perfect Loaf – Link
  2. [2]
    Plötzblog – Plötzblog – Link