Film Development Time Calculator by Temperature

Adjust a documented black and white film development time to the temperature in your tank, with a clear reference band around the reading.

Choose a documented film and developer row

Enter the temperature of the developer in the tank. The guide starts from a documented time at 20 °C.

Darkroom reading HP5 Plus · ILFOTEC DD-X 1+4
Near standard
Adjusted starting time 9 min 00 sec
At 20 °C9 min 00 sec
Meter settingEI 400/27

This is a starting guide, not a guarantee. Agitation, equipment, contrast target and personal process can change the result.

Film stock
Developer
Dilution
20 °C

Enter the temperature of the developer in the tank. The guide starts from a documented time at 20 °C.

Temperature field notes

A practical guide around the measured temperature. The highlighted row is your reading.

TemperatureGuide timeFrom 20 °C
15 °C14 min 30 sec-5 °C
16 °C13 min 15 sec-4 °C
17 °C12 min 00 sec-3 °C
18 °C11 min 00 sec-2 °C
19 °C10 min 00 sec-1 °C
20 °C9 min 00 sec20 °C Current
21 °C8 min 00 sec+1 °C
22 °C7 min 15 sec+2 °C
23 °C6 min 30 sec+3 °C
24 °C6 min 00 sec+4 °C
25 °C5 min 15 sec+5 °C
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Frequently Asked Questions

What temperature does the calculator use as its base?

Each selected development row starts from the manufacturer time at 20 °C and adjusts it for the measured developer temperature.

Are the adjusted times guaranteed?

No. They are practical starting guides. Agitation, equipment, contrast target and your tested process can change the result.

Why does the calculator warn below 5 minutes?

Very short development times leave less room for even pouring, agitation and draining, so manufacturer guidance warns that uneven development becomes more likely.

What should I do when my film and developer are not listed?

Use the film and developer manufacturer technical sheet or a trusted development table. This tool does not invent an undocumented combination.

# How to adjust film development time for temperature

Choose the exact film, developer and dilution documented in the table, then enter the temperature of the working solution. The calculator starts from the published time at 20 °C and gives you a practical adjusted time.

# Read the result as a starting point

Temperature changes chemical activity, so a warmer developer generally needs less time and a cooler developer generally needs more. The reference band makes the direction visible around your reading.
Keep the process honest
Do not treat a calculated time as a universal recipe. Agitation, tank geometry, developer age, contrast target and your own repeatable tests still matter.

# Why the documented row matters

  • The film and developer pairing controls contrast and effective speed.
  • Dilution changes developer activity and cannot be safely inferred from another dilution.
  • Times shorter than 5 minutes deserve extra caution because small handling differences have a larger effect.

Primary references

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