// multi-utility computation suite · offline · instant · precise
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sci.thermal-death-time-D-value Calculator
Calculates thermal death time D-value = t/log(N₀/N) for microbial inactivation and z-value (temperature required for 1 log change in D). D₁₂₁(C. botulinum) = 0.2 min — the 12-D botulinum cook (commercial sterility) requires 2.4 minutes at 121 °C (250°F) for low-acid canned foods.
Inputs
D Ref Min
Reference formula or conversion factor shown for context.
T Ref C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
T Process C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Z Value C
Reference formula or conversion factor shown for context.
Results
D-value at process temp (min)
The computed numeric or monetary value.
Lethality F₀ per minute at T
The value at the specified point or condition.
12D time for Clostridium botulinum (min)
The computed duration or time value.
D_T = D_ref × 10^((T_ref−T)/z)
Reference formula or conversion factor shown for context.