What Is Baker's Percentage? A Beginner-Friendly Guide to Bread Ratios

Baker's percentage is the most common way to understand a bread formula by ratio. Flour is always the reference point, and the total flour weight is treated as 100%. Water, salt, yeast, butter, and every other ingredient are expressed as a percentage of that flour.

For example, if a dough uses 500g flour, 325g water, 10g salt, and 5g instant yeast, the flour is 100%, the water is 65%, the salt is 2%, and the yeast is 1%. Those numbers tell you a lot about the dough before you even start mixing.

Baker's percentage makes it easy to scale a recipe to a new batch size without changing the character of the dough. If the ratios stay the same, the texture and flavor stay much more consistent.

It is also useful for comparing formulas. One loaf may feel soft because the hydration is high, while another feels rich because the butter percentage is higher. Ratios reveal those differences faster than ingredient lists alone.

The formula is ingredient weight ÷ total flour weight × 100. The important detail is that the reference is not the total dough weight, but the total flour weight.

If a recipe uses more than one flour, you add them together first. So if you use 400g bread flour and 100g rye flour, the total flour is 500g and 350g of water becomes 70%.

Imagine a recipe with 500g flour, 325g water, 30g sugar, 10g salt, 5g yeast, and 25g butter. Every percentage is calculated against the 500g flour weight.

That gives you 65% water, 6% sugar, 2% salt, 1% yeast, and 5% butter. Once the formula is written that way, it becomes much easier to rebuild it at 750g or 1kg of dough.

A very common mistake is to read 65% hydration as 65% of the total dough. In baker’s math, 65% always means 65% of the flour weight. That is why all percentages together often add up to more than 100%.

Another point of confusion is hydration versus baker's percentage. Hydration refers only to water. Baker's percentage is the broader system that covers every ingredient in the formula.

You can always do the math by hand, but once you start testing the same dough several times, it becomes more useful to keep the calculations and your bake notes together. BreadDiary lets you save the formula, compare ratios, and keep track of how each version turned out.

That makes it easier to remember which hydration felt best, what happened when the sugar changed, or how a different fermentation schedule affected the crumb. It becomes more than a calculator—it turns into your baking notebook.