Calculate long exposure in film

I developed this free calculator app as a tool for myself but am making it available to anybody who may find it useful. Select from a number of common films, enter your metered time, and then (optionally) add stops if you're using a filter. The calculator will factor in the film's reciprocity rate and give you an accurate exposure time.

It can be used on a desktop, but it's optimized for mobile format, so use the QR code below to open it in your phone. If using Safari on your phone, you can bookmark the site and it will become a handy web app that you can access like a native app from your Home Screen.

If you experience issues with the app or have film addition suggestions, let me know. If you like it and find it useful, buy me a roll of film!

Launch the Calculator