The math behind great baking, done right

Why BakersMath exists

I built BakersMath because I wanted a sourdough hydration calculator that actually understood baker's math. Not one that asked for cups. Not one that assumed a 100% hydration starter. One that extracted the flour and water from the starter, accounted for real hydration, and gave me exact gram weights.

That calculator didn't exist in a form I could actually use. So I built it. Then I needed a yeast converter that handled sourdough starter (most don't). Then a fermentation planner that used Q10 temperature modeling instead of a lookup table. Then the rest.

Every calculator on this site was built to solve a problem I actually had. The math is correct, the units are grams, and the tools work the way professional bakers think about bread.

What makes these calculators different

Most baking calculators are simple unit converters dressed up in a recipe interface. They don't understand baker's math. They don't account for hydration inside your starter. They don't model fermentation rate against temperature. They don't know the difference between a poolish and a biga.

BakersMath calculators are built around how bakers actually think:

• Flour is always 100%. Everything else is a percentage of flour weight.
• Sourdough starter contributes flour and water to the dough (the calculator accounts for this automatically).
• Fermentation time depends on temperature, dough type, and yeast amount, not just a fixed "2 hours."
• Scaling a recipe means understanding baker's percentages, not just multiplying by 2.

The tools are free with no accounts or paywalls. The site is ad-supported, which is what keeps it free. The goal is to be the most accurate and most useful baking calculator hub on the internet.

The baking background

I've been baking bread and making pizza at home for years. It started during the stay home time, and with one of my kids having allergies, it was safer to bake than buy online so that is what I did and it grew from there. Nothing professional, just the kind of baking that eventually makes you want to understand why things work the way they do.

What pushed me toward the math was, 1) I'm a math guy and 2) wanting consistent results. Once you want four loaves instead of one, or a pizza dough that works every time, or to halve a recipe because 800g of butter is genuinely a lot, intuition stops being enough. Baker's percentages turn recipes into ratios, and ratios scale. These calculators are what I built for myself, shared in case they're useful to anyone else doing the same thing.

Sources, accuracy and precision

Conversion values come from USDA FoodData Central, King Arthur Baking's ingredient weight charts, and manufacturer data (Bob's Red Mill, Fleischmann's, others). Fermentation models use the Q10 temperature coefficient, a standard biological principle calibrated against dough-type constants. Altitude adjustments follow CSU Extension guidelines.

The formulas themselves are mathematically exact. What you see in the results isn't an approximation: it's the formula output, displayed at the precision your kitchen scale can use. Flour and water round to the nearest gram (your scale doesn't read 342.7g). Salt rounds to 0.1g (because 2g vs 2.3g matters). Yeast rounds to 0.01g (because at 0.2% of flour, you need a jeweler's scale). The rounding is calibrated to real baking, not cut for convenience.

I use AI to cross-reference formulas against multiple sources, verify behaviour at edge cases (extreme hydrations, unusual temperatures, high enrichment levels) and catch errors before they affect your bake. This elevates the validation process before it gets added to the site. The goal is calculators that are right the first time, for every input, not just the typical ones.

Every calculator page lists its sources. If you find a value that doesn't match your experience, the most likely cause is a different measuring standard (packed vs. spooned flour being the most common). Feel free to reach out.

Get in touch

Questions, corrections, or calculator requests: hello@bakersmath.co

If you've found BakersMath useful, the best thing you can do is share it with other bakers. These tools are most helpful to the people who would otherwise spend 20 minutes doing the math by hand.