34 Free Tools

Calculators & Reference

Practical utilities for film photography — organised by what you're trying to do. No signup required.

Reciprocity Calculator

Calculate exposure compensation for long exposures. Select your film, enter the metered time, get the corrected exposure.

Development Timer

Countdown timer with agitation reminders. Set your process, hit start, follow the prompts.

Before You Shoot

Planning and preparation

Film Finder

Answer 5 questions, get film recommendations

Golden Hour Calculator

Sunrise, sunset, and golden hour times

Film Comparison

Compare film stocks side-by-side

Film Cost Calculator

Calculate true cost per frame

Timelapse Calculator

Plan intervals and clip durations

In the Field

Exposure and focus calculations

Sunny 16 Rule

Daylight exposure without a meter

Depth of Field

Calculate focus range for any lens and aperture

Hyperfocal Distance

Find optimal focus for maximum sharpness

ND Filter Calculator

Exposure adjustments for neutral density filters

Filter Factors

Exposure compensation for coloured filters

Flash Guide Number

Calculate flash power and distance

Bellows Factor

Exposure compensation for macro and close-ups

Lens Coverage

Check if a large format lens covers your film format

Night & Astro

Long exposure and astrophotography

Star Trails Calculator

Exposure times for sharp stars or trails

Pinhole Calculator

Optimal pinhole size and exposure

In the Darkroom

Film processing and printing

Development Times

Find times for any film and developer combination

Push/Pull Guide

Adjusted development times for pushed and pulled film

Dilution Calculator

Calculate developer and water volumes

Chemistry Mixing Calculator

Mix stock solutions from powder concentrates

Zone System

Tonal control and exposure placement

Paper Grade Calculator

Match paper grade to your negative density range

Print Exposure Calculator

F-stop printing, enlarger height compensation, and test strips

Scanning & Digitising

Getting your images digital

Scanner Comparison

Compare scanners side-by-side

DPI Calculator

Scan resolution for your target print size

Print Size Calculator

Maximum print size from any film format

Crop Factor Calculator

Convert focal lengths between formats

Alt Process & Printing

Calibration and alternative processes

Curve Builder

Build correction curves for digital negatives — Quick Start for beginners, Full Calibration for experts

Learning & Reference

Fundamentals and conversions

EV Calculator

Exposure values, equivalent exposures, and lighting reference

Exposure Triangle

Visualise aperture, shutter, and ISO relationships

Film Speed Converter

Convert between ISO, ASA, and DIN

Format Comparison

Compare film and sensor sizes

Colour Temperature

Kelvin scale reference for light sources