The math behind every roll of film
Everything for the roll in your camera. Start with free calculators: price a roll, rescue an expired one, and decode Kodak's new names.
Roll Math
Free calculators for film shooters
01 · $ per frame
Film cost
What a roll really costs once you add developing, scans and shipping.
Price a roll →02 · ISO
Expired film
Turn the dial to the box speed and year to get the ISO for an old roll.
Find the ISO →03 · Old name, new name
Kodak names
Portra is now Ektacolor Pro. T-Max is Ektapan. Look up any Kodak film.
Look up a film →Coming next
- Film lab finderUS labs with comparable prices for developing and scanning one roll of 35mm.
- Reciprocity calculatorLong-exposure correction for every major film, in one place.
- Bulk loading savingsWhat a 100 ft roll saves you over buying single rolls.
How the numbers work
Every tool runs in your browser and shows its assumptions. Prices are dated samples you can change. Where a number is an estimate rather than a published figure, the page says so.