Black & white film developing time calculator

Enter the film and developer information to calculate the developing time necessary for that combination.

Film stock

Select a film stock

Ilford PanF PlusIlford FP4 PlusIlford HP5 PlusIlford Delta 100 ProfessionalIlford Delta 400 ProfessionalIlford Delta 3200 ProfessionalIlford SFX 200

Film ISO

Film developer

Select a film developer

Ilford ID-11

Developer dilution

Using a rotary processorA reduction of 15% will be applied to compensate for higher levels of agitation

The information provided in this calculator uses data from official sources, such as Ilford and Kodak, as well as data verified in our community darkroom.