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Tools

Development calculator

Choose a film and a developer, then the dilution, speed and temperature the time was published for. You get the maker’s time with the datasheet it came from — and, if you need them, NegaKit’s corrections for a warmer bath or a reused developer.

  1. Film

    513 films have published times.

    Kodak Alaris 200T · ISO 200 · ECN-2

  2. Developer

    Only developers with published times for this film.

    CineStill Cs2 "Cine-Simplified" ECN-2 Kit 1 time

  3. Dilution, speed and temperature

How the numbers are worked out

Only what is published

Every time is a maker’s or a source’s own, read off the datasheet linked beside it. Speeds, dilutions and temperatures are the ones published: nothing is extrapolated, so a push nobody published is simply not on the list.

A warmer or cooler bath

For black-and-white film only, and only between 18 and 26 °C: about 9 % shorter for each degree warmer, rounded to 5 seconds. It is the rule NegaKit’s developing timer uses, which follows Ilford’s and Kodak’s temperature charts closely in that range. Colour processes and monobaths are not corrected.

A reused developer

NegaKit’s chemistry rule: a reusable black-and-white developer at stock strength +10 % for each roll already through it, a colour kit +2 %. One-shot developers and working dilutions are used once, so they get no correction; nor does a monobath, which NegaKit has no rule for.