Pizza dough that doesn't rise is most often blamed on the yeast—but the problem rarely lies with the yeast itself. Fresh and dry yeast behave differently, require different amounts, and the proofing time completely changes the final result. In this article, we compare both types of yeast and show how to calculate the right amount so that the dough rises evenly both in the refrigerator and at room temperature.
Fresh and dry yeast: the main difference
Although they may seem like two completely different products, both types of yeast are actually the same microorganism—Saccharomyces cerevisiae. The only difference is the moisture content. Fresh yeast is compressed and contains about 70% water, while dry yeast retains only 5–8% moisture. This is precisely why less dry yeast is needed and why it has a longer shelf life. Both are suitable for pizza dough—the important thing is to calculate the correct amount.
Fresh (compressed) yeast
Fresh yeast is sold in cubes, usually in 25 g or 42 g packages, and kept in the refrigerator. It incorporates into the dough more quickly, gives it a mild, clean flavor, and is a favorite among traditional pizza makers. Its drawback is its short shelf life: an opened cube in the refrigerator lasts only about a week, and frozen yeast loses some of its activity.
Dry yeast: active and instant
Dry yeast comes in two types. Active dry yeast is dissolved in warm water with a pinch of sugar before use, while instant yeast is sprinkled directly into the flour—its granules are smaller, so it incorporates almost instantly. Instant yeast is the most common in home kitchens: it does not need to be activated, lasts a long time when sealed, and is convenient for an impromptu pizza night.
Advantages and disadvantages at a glance
Fresh yeast: milder flavor, faster rise, but a short shelf life and requires refrigeration.
Instant dry yeast: convenient, lasts a long time, easy to measure, but has a slightly stronger yeasty flavor.
Active dry yeast: the traditional option, requires an additional activation step.
How to calculate the amount of yeast based on the weight of the flour
The simplest rule to remember is that you need three times as much fresh yeast as dry yeast. In other words, 1 g of dry yeast is equivalent to about 3 g of fresh yeast. If the recipe calls for fresh yeast but you have dry yeast, simply divide the amount by three—and vice versa.
Here are the approximate amounts when the dough rises for about 8 hours at room temperature:
| Amount of flour | Instant dry yeast | Fresh yeast |
|---|---|---|
| 500 g | 2–3 g | 6–9 g |
| 1 kg | 4–6 g | 12–18 g |
| 2 kg | 8–12 g | 24–36 g |
For beginners, the safest approach is to use about 0.5% dry yeast relative to the weight of the flour. This means that 1 kg of flour only needs 5 g of dry yeast—much less than many people add by instinct. Too much yeast makes the dough rise too quickly: it develops an alcoholic flavor, does not spread well, and loses its airiness in the oven.
How much yeast to use depending on the proofing time
The longer the dough rises, the less yeast you need. A long, slow rise in the refrigerator is one of the most important secrets of Neapolitan pizza: it allows the dough to mature, develops a deeper flavor, and helps the air distribute evenly throughout the dough.
| Proofing time | Dry yeast (per 1 kg of flour) |
|---|---|
| 4–5 hours at room temperature | 6–8 g |
| 8 hours at room temperature | 4–5 g |
| 24 hours in the refrigerator | 2–3 g |
| 48–72 hours in the refrigerator | 0.8–2 g |
If you want a slow rise in the refrigerator, feel free to reduce the amount of yeast by half or even more. Less yeast does not mean weaker dough—it means more time for the flavor to develop.
Practical tips for an even rise
Proofing in the refrigerator
Cold slows down the yeast but does not stop it, so the dough can rise in the refrigerator for 24–72 hours. Place it in a covered container so the surface does not dry out, and keep it on the lowest shelf of the refrigerator, where the temperature is more stable. Before baking, take the dough out and let it warm up for about 1–2 hours—this will make it more pliable and easier to stretch.
Proofing at room temperature
The ideal room temperature for the dough to rise is 22–24°C. If the kitchen is cooler, the rise will slow down; if it is warmer, it will speed up. Therefore, it is better to watch the dough itself rather than the clock: it should double in size and become airy but not overproof. Avoid drafts and direct sunlight; covering the dough with a cloth or lid will prevent it from drying out and help it rise more evenly.
Water temperature and salt
Yeast is sensitive to heat: temperatures above 45°C can kill it. Use warm, not hot, water—about 22–26°C. Sprinkle the salt separately from the yeast, as direct contact weakens its activity. If you are activating the yeast separately, add a pinch of sugar or honey to the water—this confirms that the yeast is alive and gives it an initial boost.
Which yeast to choose with Caputo flour
With professional pizza flour such as Caputo, a slow rise and a small amount of yeast are the best choice. Caputo flour has a high protein content and absorbs water exceptionally well, so the dough retains gas longer—it does not need a large amount of yeast. If you want a light, airy dough, choose instant dry yeast and proof it in the refrigerator for 24–48 hours; if you prefer a traditional process, fresh yeast is perfect for your first introduction to Italian pizza making.
Summary
Fresh and dry yeast are not competitors—they are simply two options for the same process. The most important things to remember are that you need about three times as much fresh yeast as dry yeast, and the longer the dough rises, the less yeast you can use. Start with a small amount of dry yeast, give the dough time, and a crispy, airy pizza crust will be completely achievable in your kitchen.
