Proofing Time Calculator Formula

Understand the math behind the proofing time calculator. Each variable explained with a worked example.

Use the Proofing Time Calculator

Formulas Used

First Rise (Bulk Fermentation)

first_rise_min = round(base_time * temp_factor * yeast_factor * (flour_cups / 3))

Second Rise (After Shaping)

second_rise_min = round(base_time * temp_factor * yeast_factor * (flour_cups / 3) * 0.6)

Cold Proof (Fridge)

cold_proof_hr = round(base_time * temp_factor * yeast_factor * (flour_cups / 3) * 0.15)

Variables

VariableDescriptionDefault
room_temp_fRoom Temperature(°F)72
yeast_tspActive Dry Yeast(tsp)2.25
flour_cupsFlour Amount(cups)3
base_timeDerived value= 90calculated
temp_factorDerived value= 75 / room_temp_fcalculated
yeast_factorDerived value= 2.25 / yeast_tspcalculated

How It Works

How Proofing Time Is Estimated

Factors Affecting Proofing

  • Temperature: Yeast is most active at 75-80°F. Lower temperatures slow fermentation; higher temperatures speed it up.
  • Yeast amount: More yeast means faster rising. The standard is 2.25 tsp (one packet) per 3 cups flour.
  • Flour amount: More flour takes longer to rise because there is more structure to inflate.

    • Formula

    Proofing Time = Base Time x (75 / Room Temp) x (2.25 / Yeast) x (Flour / 3)

    Base time is approximately 90 minutes for a standard dough at 75°F. The second rise is typically 60% of the first rise time.

    Worked Example

    Estimate proofing time for a standard dough (3 cups flour, 2.25 tsp yeast) at 72°F.

    room_temp_f = 72yeast_tsp = 2.25flour_cups = 3
    1. 01Temp factor = 75 / 72 = 1.042.
    2. 02Yeast factor = 2.25 / 2.25 = 1.
    3. 03First rise = 90 * 1.042 * 1 * 1 = 94 minutes.
    4. 04Second rise = 94 * 0.6 = 56 minutes.
    5. 05Cold proof = 94 * 0.15 = 14.1 hours.

    Ready to run the numbers?

    Open Proofing Time Calculator