FilmCalc

Compare film + development costs across labs

Format

Cost out one specific roll by hand — enter the film and target speed, and see which lab is cheapest for it below. To browse and rank saved films by ISO, use the Lab Costs tab.

Film

Box Speed (ISO)

The film's rated speed (on the box)

Process

Film Cost ($)

Postage ($)

Rolls

Exposures per Roll

Dev is a flat per-roll fee, so more exposures = lower cost per photo.

Shooting at (Target ISO)

Only change this if you're pushing or pulling. Box 400 → shooting 800 = +1 stop push.

· ·

⚙️ More options — extra fees

Extra Fees

Once-off Fee ($)

Per-roll Fee ($)

🔖 Jump here from a shop page (bookmarklet)

Drag this button to your bookmarks bar. While browsing a film or lab shop page, click it to jump straight back here with that page's link already filled in — no copy/paste needed.

✨ Add to FilmCalc

Generated for — self-hosting elsewhere gets a bookmarklet pointing at your own instance automatically. Still check every price against the real page once it's imported.

Film Setup

Narrow the list and choose what new/edited films save as with Format and Process below — issue #116 moved both to the top so "Load a saved film" isn't every film at once.

Process

Film Name

Box Speed (ISO)

Max Push/Pull (stops)

Applies to the whole film stock, not individual bundles. The Film Lookup tab warns if this film is loaded and pushed/pulled further than this.

Hide this film from the Calculator

Bundles

One film stock, many bundles — e.g. a 3-pack vs. a bulk 10-pack, or 24exp vs. 36exp, each with its own price, store, and buy link. Add a bundle for each size you buy.

Every saved film profile (built-in + custom), grouped by Box Speed. The cheapest cost-per-photo bundle at each ISO is highlighted, with its buy link and pack total if you saved one.

All Saved Films

Appearance

Theme

Custom colour themes from the project's themes/ folder. Each theme defines both light and dark variants, so the light/dark toggle keeps working.

Calculator Settings

Currency

Symbol shown in front of every cost throughout the app.

⚠️

This only changes the label, not the numbers. Every price you've entered or saved stays exactly as typed — switching to € here doesn't convert dollars to euros. Mixing prices you entered in one currency with labs/films saved in another will silently produce nonsense totals.

Recommended Pick Threshold

In "Labs For This Roll", if the cheapest Hi-Res + Fastest option costs less than this percentage more than the absolute cheapest, its card is highlighted gold as the recommended pick — since a small premium is usually worth both perks. "Cheapest Total" always shows the actual cheapest option, unchanged.

% price premium allowed

Default Lab & Service

Your usual lab and service tier (e.g. Irohas · Next Day · Hi-Res). When set, the Film Lookup headline shows your cost with this lab, and notes the cheapest option underneath. Leave as "None" to always show the cheapest.

Re-run the setup screen to pick your home lab and ♥ favourite / ✕ ignore film stocks.

Data

Export Data

Download your saved films/labs/settings as YAML. "Export Everything" writes a config.yaml. "Films/Labs Only" asks for a preset name that's saved inside the file — so it shows up by that name when re-imported (drag & drop supported) or dropped into the project's films/ or labs/ folders.

Import Data

Pick from the project's built-in film/lab presets, or upload your own config.yaml, films.yaml, or labs.yaml.

Help

Quick Start Guide

New here, or not sure what a tab does? The wiki walks through finding your cheapest lab, comparing film stocks, building your library, and personalizing FilmCalc.

📖 Quick Start Guide ↗

Report an Issue

Found a bug, a wrong calculation, or have a feature idea? File it on GitHub — it opens in a new tab and takes a couple of minutes.

🐛 Report an Issue ↗

Delete All Data

Permanently deletes every saved film, lab, and setting from this browser. Built-in defaults from config.yaml aren't affected. Consider exporting a backup first — this can't be undone.

Labs For This Roll

All Options

FilmCalc

Lab Setup

Film Setup

Appearance

Theme

Calculator Settings

Currency

Recommended Pick Threshold

Default Lab & Service

Data

Export Data

Import Data

Write Live Config to Server

Help

Quick Start Guide

Report an Issue

Delete All Data

Import Data

From the Project Library

Or Upload a File

✨ Add with AI

Set Up Your Favourites

Theme

Your Home Lab

Your Film Stocks

Labs For This Roll

📝 What's New