Developer Time/Temperature Calculator

©2004 Robert Schaller/Chris Healer/Filmachines, LLC

Time known (in seconds) Temperature Known°C Temperature Coeficient* New Temperature °C Time at New Temperature

* The developer Temperature Coefficient is the factor by which developement time is multiplied if the temperature is increased 10F°/5.5555556C°. It is different for each developer, reflecting a particular developer's response to temperature. It is typically slightly less than 2.0, with the value 1.7 seeming to work for D-19 as a Reversal first developer (with 2g/l KSCN), and 1.8 given in the literature for D-76 and other "standard MQ developers," and 2.3 for "super fine-grain developers." (Jacobson, Developing, p.72).  A list of typical temperature coeficients is coming soon!

Celsius/Farenheit Converter

Temperature in °C     Temperature in °F

Enter a temperature in either Celsius or Farenheit, and the equivalent in the other scale will be automatically displayed.


Time/Temperature Values for 7363 in D-19 + KSCN first developer (using a coeficient of 1.7)