Biga

Biga is a stiff Italian pre-ferment — a portion of flour, water, and a tiny amount of yeast mixed and fermented before the final dough. With hydration between 50% and 60%, biga has a firm, dough-like consistency that sets it apart from wetter pre-ferments like poolish. It must be torn into pieces before incorporating into the final mix, and it rewards patience with deeper flavor and stronger dough structure.

Italian bakers have relied on biga for generations. It appears in classic breads like ciabatta and Pugliese, in enriched doughs like panettone, and increasingly in artisan pizza. If you want a nuttier, more complex taste and better oven spring, biga is worth the 12-24 hour wait.

How biga works

The lower hydration creates an environment where fermentation proceeds more slowly and produces different byproducts compared to a 100% hydration poolish. Here is what that means for your dough:

• More dough strength: The stiffer consistency encourages gluten development during the long ferment, giving the final dough better structure
• Nuttier flavor: The drier environment favors specific organic acids and alcohols, creating a deeper, toastier taste profile rather than the mild tang of poolish
• Better volume and oven spring: Stronger gluten means the dough traps gas more effectively, producing taller loaves and a more structured crumb
• Improved extensibility: Despite being stiff, biga still relaxes the final dough enough for easier shaping and stretching

The science comes down to water activity. Less available water slows yeast metabolism, so fermentation takes longer — but that extra time lets enzymes break down starches into sugars, developing flavors that a short, fast ferment cannot match.

Biga formula

A standard biga uses roughly 55% hydration expressed in baker's percentage:

The yeast amount is deliberately tiny. With only 0.1g per 100g of flour, fermentation stays slow and controlled over 12-24 hours. Using more yeast speeds things up but sacrifices flavor complexity.

The result is a shaggy, dry dough ball — not smooth like a finished bread dough. It should feel firm and slightly rough. If it is too sticky, the hydration is too high; if it cracks and will not come together, add a few grams of water.

Scaling your biga

Most recipes call for 20-40% of the total flour weight as biga. For a pizza dough using 500g total flour:

• 20% biga: 100g flour, 55g water, 0.1g yeast — subtle flavor boost
• 30% biga: 150g flour, 82g water, 0.15g yeast — balanced flavor and structure
• 40% biga: 200g flour, 110g water, 0.2g yeast — pronounced nutty flavor, strong structure

Higher biga percentages give more flavor but require careful hydration management in the final dough, since the biga flour has already absorbed water.

How to make biga

1. Measure ingredients by weight using a kitchen scale. Precision matters — even 5g of extra water changes the consistency
2. Combine flour and water in a bowl. Mix until no dry spots remain. The mixture will be shaggy and stiff
3. Add yeast and work it in. Knead briefly — 2-3 minutes — just enough to distribute the yeast evenly. Do not develop the gluten fully
4. Shape into a rough ball, cover the bowl with plastic wrap or a damp towel
5. Ferment at room temperature (18-20°C / 64-68°F) for 12-24 hours

The biga is ready when it has roughly doubled, the surface is slightly domed, and it smells pleasantly yeasty — not sour. To incorporate it, tear the biga into walnut-sized pieces and add them to your final dough mix along with the remaining flour, water, salt, and yeast.

Timing and temperature

Biga fermentation time depends heavily on temperature:

Reading your biga

• Ready: Roughly doubled, slightly domed top, pleasant yeasty aroma, springs back slowly when poked
• Under-fermented: Has not doubled, dense when torn open, bland smell — give it more time
• Over-fermented: Collapsed or concave surface, sour or alcoholic smell, sticky and slack texture

Biga tolerates a wider fermentation window than poolish because the lower water activity acts as a natural brake on yeast activity. That said, a biga left at 24°C for 24 hours will over-ferment. Adjust time and temperature together.

Cold fermentation option

For even more flexibility, you can start biga at room temperature for 2-3 hours, then move it to the fridge (4-6°C) for up to 48 hours. This cold fermentation approach slows things down further and develops even more complex flavors. Pull it out 1-2 hours before mixing to take the chill off.

Common uses

• Ciabatta: Many Italian bakers prefer biga over poolish for ciabatta. The extra structure supports the high hydration of the final dough while still producing an open crumb
• Pugliese bread: This traditional bread from Puglia relies on biga for its characteristic chewy texture and nutty crust
• Artisan pizza: Biga adds complexity to pizza dough without the extreme extensibility of poolish. It works especially well in Neapolitan-style pizza and NY-style pizza dough where you want structure and flavor
• Panettone: Some recipes use biga as the initial ferment before building the enriched dough with butter and eggs
• Focaccia and flatbreads: A short biga (8-12 hours) adds subtle depth without overcomplicating the recipe

Poolish vs biga

Both are pre-ferments, but they behave differently. For a deeper comparison, see the full poolish vs biga guide.

When to choose biga: You want a nuttier flavor, more dough strength, or a longer fermentation window. Biga is forgiving if you cannot mix the dough at the exact right moment.

When to choose poolish: You want a more open crumb, milder flavor, or a shorter timeline. Poolish mixes into the final dough more easily since it is already liquid.

Troubleshooting biga

Biga did not rise: The environment may be too cold, or the yeast may be dead. Check that your yeast is fresh and that room temperature is at least 18°C. A small amount of yeast needs warmth to get going.

Biga is too sticky: The hydration is too high. Next time, reduce water by 5g. If it is already mixed, dust with flour and let it ferment — it will still work, just with slightly different characteristics.

Biga smells sour or alcoholic: It over-fermented. You can still use it if the smell is mild — the sourness will dilute in the final dough. If it smells strongly of alcohol or vinegar, start over.

Biga is crumbly and will not hold together: The hydration is too low. Add a few grams of water and knead briefly. Aim for a dough that is stiff but cohesive.

Final dough is too tight after adding biga: The biga added a lot of pre-developed gluten. Let the final dough rest longer (try a 30-minute autolyse before adding salt) and use gentle folding during bulk fermentation rather than aggressive kneading.

Frequently asked questions

Can I refrigerate biga?

Yes. Start it at room temperature for 2-3 hours, then refrigerate for up to 48 hours. Pull it out 1-2 hours before mixing to warm up. Cold biga develops even more complex flavors.

How much biga should I use?

Most recipes use 20-40% of the total flour as biga. Start with 25-30% for a balanced flavor boost. Higher percentages (40%+) give stronger flavor but require adjusting the final dough hydration.

Can I use instant yeast instead of fresh?

Yes. Use the same tiny amount — 0.1g per 100g flour. Both instant and active dry yeast work. Fresh yeast can also be used at roughly 0.3g per 100g flour.

What flour should I use for biga?

The same flour you plan to use in the final dough. For pizza, that is typically Type 00 or bread flour. Strong flours (high protein) handle the long fermentation better without breaking down.

Is biga the same as a sourdough starter?

No. Biga uses commercial yeast and ferments for 12-24 hours. A sourdough starter uses wild yeast and bacteria, and takes days to develop. The flavors are quite different — biga is nutty and mild, sourdough is tangy and acidic.

In Fond

Fond's Pizza Workshop has biga as a built-in pre-ferment option. Select it, set your flour percentage, and the pizza dough calculator splits everything between the biga and the main dough automatically — flour, water, yeast, and timing. No manual math, no spreadsheets. Just pick your style, adjust the hydration, and start mixing.