Autoclave Cycle Calculator

Calculate sterilization cycle time, temperature, pressure, and F₀ value based on load type, chamber size, and density.

Inputs

Chamber volume (L)

Load volume (L)

Load type (1-5)

Load density (kg/L)

Tab to move between fields

Results

Total cycle time (min)

Temperature (°C)121

Pressure (psi)15

Exposure time (min)30

Come-up time (min)12

Exhaust time (min)5

Dry time (min)20

F₀ value (min)30

Log reduction20

Chamber utilization (%)60

Load mass (kg)30

Energy estimate (kWh)2.23

Cycles per 8-hr shift5

Exhaust TypeFast

How to Use This Calculator

Enter the load type (liquids, dry goods, mixed) to set default cycle parameters.
Input the autoclave temperature in °C (121°C for standard, 134°C for fast cycle).
Set the sterilization hold time in minutes based on load volume and density.
Enter heat-up and cool-down time estimates for your autoclave model.
Review the total cycle time and log it in your lab notebook for compliance records.

How the result changes with Load volume (L)

Load volume (L)	Total cycle time (min)
200	75.5
700	100.5
1,300	130.5
1,800	155.5

What each input means

Chamber volume (L): Internal volume of the autoclave chamber in liters.
Load volume (L): Volume of the load being sterilized in liters.
Load type (1-5): 1=Wrapped instruments, 2=Unwrapped, 3=Liquids, 4=Waste/biohazard, 5=Prion decontamination.
Load density (kg/L): Average density of the load material in kg per liter.

What each result means

Total cycle time (min): Complete cycle time including come-up, exposure, exhaust, and drying.
Temperature (°C): Sterilization temperature for the selected load type.
Pressure (psi): Chamber pressure during sterilization.
Exposure time (min): Duration at sterilization temperature.
Come-up time (min): Time to reach sterilization temperature.
Exhaust time (min): Time for pressure release after sterilization.
Dry time (min): Post-cycle drying time (0 for liquids/waste).
F₀ value (min): Equivalent sterilization time at 121 °C reference (z=10 °C).
Log reduction: Estimated log₁₀ microbial reduction (based on D-value of 1.5 min for G. stearothermophilus).
Chamber utilization (%): Percentage of chamber volume occupied by the load.
Load mass (kg): Estimated load mass from volume and density.
Energy estimate (kWh): Approximate energy consumption per cycle.
Cycles per 8-hr shift: Maximum cycles possible in an 8-hour shift including 15 min load/unload.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Chamber volume (L) = 50, Load volume (L) = 30, Load type (1-5) = 1, Load density (kg/L) = 1 = 4 input(s) provided
Calculate Total cycle time
Total cycle time = comeUpTimeMin + exposureMin + exhaustTimeMin + dryTimeMin
67 = 67
Calculate Temperature
Temperature
121 = 121
Calculate Pressure
Pressure
15 = 15

The questions that sit next to this one — chosen by subject, including calculators filed under a different category.

Tattoo & Piercing