Watson Dairy Consulting

Pasteurisation F-Value Calculator

Convert between time and temperature using Bigelow's z-value model for thermal equivalence in pasteurisation and sterilisation.

Inputs

Quick presets: HTST milk 72°C/15s Batch 63°C/30min ESL 125°C/4s

Reference temp T₁ (°C)

Reference time t₁ (s)

Actual temp T₂ (°C)

z-value (°C)

C. burnetii: 4.34°C | General thermal: 7-10°C

Equivalent time at T₂—

Equivalent time at T₂ (minutes)—

F-value (lethality at T_ref)—

Enter inputs to calculate.

Temperature (°C)	Equivalent time