Bread Calculator

Baker's percentages for bread

Baker's percentages set flour at 100% and express every other ingredient as a percentage of that flour weight. A 70% hydration loaf contains 700 g of water per 1000 g of flour. This standard makes it easy to compare recipes — a 65% hydration loaf is noticeably tighter and denser than an 80% hydration sourdough — and to scale quantities without re-rationing by volume.

The total dough weight includes all ingredients: flour, water, salt, and yeast. To find the flour weight that produces a given total, divide total dough by the sum of all baker's percentage factors: (1 + hydration/100 + salt/100 + yeast/100).

For starter-based doughs, count the starter flour and water separately and switch to the sourdough calculator so the preferment is not left out of the formula.

Hydration, crumb structure, and crust

Bread hydration directly shapes the final loaf. A 65% hydration sandwich loaf has a fine, even crumb that is easy to slice. A 75% ciabatta has large, irregular holes and a chewy, open texture. Sourdoughs and artisan loaves typically run 72–82%. Very high hydration doughs (85%+) are slack and best shaped in tins or bannetons rather than freeform.

Salt at around 2% of flour weight is essential for flavour, gluten development, and fermentation control. Too little salt produces flat, sticky dough; too much inhibits yeast. Instant dry yeast at 1% of flour weight is a standard starting point for a direct-mix loaf with a 1–2 hour rise at room temperature. Longer, cold fermentation uses 0.1–0.5% yeast.

Loaf weight before baking accounts for the full dough weight. Expect 10–15% moisture loss during baking. An 800 g dough ball produces approximately a 680–720 g baked loaf.

As a rule of thumb, 65–70% hydration feels tight and sandwich-friendly, 72–78% usually lands in artisan territory, and 80%+ needs gentler handling and stronger shaping.

Yeast percentage, fermentation schedule, and yeast-type swaps

A bread dough calculator is more useful when it treats yeast as a schedule decision rather than just one more static percentage. Around 1% instant yeast is a practical starting point for a same-day direct-mix loaf. Overnight room-temperature formulas often drop closer to 0.3–0.5%, while colder, slower ferments can move lower still.

Yeast type matters too. Instant yeast, active dry yeast, and fresh yeast are not identical gram for gram. A practical home-baking rule is to use about 25% more active dry yeast than instant yeast, and about three times the instant-yeast weight if you are switching to fresh yeast. That makes yeast conversion one of the clearest functional advantages in a better bread recipe calculator, because bakers are often trying to match the yeast they already have in the kitchen rather than the one printed in the recipe.

This also helps explain why two otherwise similar bread calculators can produce slightly different yeast outputs. One may assume a same-day loaf, while another assumes a slower fermentation. The flour and water math can still match exactly even when the yeast line changes for the schedule.

How to scale a bread formula by loaf count

Start by choosing the total dough weight you want to divide across the batch. If you need 2 loaves at 900 g each, the calculator sets the total dough target to 1800 g before it solves the flour and water amounts.

That batch-first workflow makes recipe scaling much easier than trying to scale each ingredient by eye. Once the dough weight is known, the baker's percentages determine how much flour remains after hydration, salt, and yeast are accounted for.

The per-loaf breakdown matters too. It tells you whether each loaf is still realistic for your tin, banneton, or proofing basket, and it gives you a quick cross-check if you only want to mix one loaf out of a larger formula.

If you already know the flour weight, switch the calculator to flour-weight planning instead. That mode is useful when you have a partly used flour bag, a bakery note that starts with flour at 100%, or a competitor baker's percentage calculator that asks for flour first rather than finished dough weight.

Choosing the right hydration for common bread styles

A good bread calculator is not just about totals; it is also about texture. Low- to mid-60s hydration keeps the dough stiff enough for a classic sandwich loaf. Low- to mid-70s hydration is a useful middle ground for round loaves, batards, and country breads. High-70s and beyond move into wetter doughs that can give you a more open crumb if you are comfortable with stretch-and-fold handling.

If a recipe feels too dense or too slack, the hydration number is usually the first place to look. A small percentage change can make a visible difference to crumb openness, shaping difficulty, and the amount of oven spring you get from the same flour.

Why grams beat cups for bread baking

Weight is the safer standard for bread because cups are affected by how the flour is scooped, packed, or spooned. Two bakers can read the same cup measure and end up with different doughs if one scoops directly from the bag and the other spoons and levels the flour.

Grams remove most of that variation and make scaling repeatable. Once you know the gram weights for flour, water, salt, and yeast, you can move from one loaf to four loaves without rethinking the ratio every time.

This is also why the result is easier to compare with a recipe card or bakery note when the source recipe already uses baker's percentages.

When to start from flour weight instead

Many bread recipes and bakery notes begin with flour because baker's percentages make flour the 100% reference point. If your note says 1000 g flour, 70% hydration, 2% salt, and 1% yeast, the calculator can now start from that flour total and tell you the dough weight and per-loaf size that will result.

This is a different question from choosing a finished loaf size. Dough-weight planning answers, "How much flour do I need for these loaves?" Flour-weight planning answers, "What batch will this flour amount make?" Both use the same baker's percentage math, but they fit different real kitchen decisions.

Flour-first planning is also helpful when you are comparing bread recipe calculators. Some tools ask for target dough weight, while others ask for flour weight. Being able to solve either way keeps the formula transparent and makes it easier to reconcile two otherwise similar bread dough calculations.

Lean doughs versus sourdough starters

This calculator is built for lean doughs that use flour, water, salt, and yeast. If your recipe includes a sourdough starter, levain, biga, or poolish, the starter contributes both flour and water, so the dough math needs an extra step.

That is the main reason the sourdough calculator exists as a separate page. It can keep the preferment visible while still letting you reason about the final dough weight and hydration.

The practical rule is simple: use this page for standard bread formulas, and use the sourdough calculator when the starter is part of the flour and water budget.

How to read the result when you bake

The result tells you the theoretical dough weights, but the finished loaf will usually be lighter after baking because moisture evaporates in the oven. That is normal and useful, not an error.

The per-loaf breakdown is the best quick check. If the flour, water, salt, and yeast per loaf look right, the batch is probably sized correctly before you start mixing.

If you are unsure whether the hydration is sensible, compare it with the texture notes above. Tight sandwich loaves usually sit lower than open-crumb artisan doughs, and very slack dough is often better suited to tins or bannetons.

A good sanity check is that a larger batch should keep the same baker's percentage ratios even when the total dough weight changes.

The baked-yield estimate is there to stop one of the most common planning mistakes: targeting the finished loaf weight as if it were the raw dough weight. If you want a baked loaf around 700 g, the dough usually needs to start somewhat higher than that.