# FocalCalc — Equivalent focal length viewer

> Equivalent focal length viewer (iPhone/iPad app by Takumi Komatsu.)

- Source: https://appshunter.io/ios/app/focalcalc/id6812771766 (this page in markdown: same URL + `.md`)
- Developer: [Takumi Komatsu](https://appshunter.io/developer/6805753098)
- Category: Photo & Video, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 3 MB
- Languages: American English, Japanese
- Released: 2026-09-24
- Data updated: 2026-09-28
- User reviews in markdown: https://appshunter.io/ios/app/focalcalc/id6812771766/reviews.md

## What is FocalCalc?

FocalCalc shows, live, what focal length your iPhone's current view corresponds to on your own cameras.

When you are scouting a location and want to know which lens will give you this framing, just hold up your iPhone. FocalCalc converts the angle of view to full frame, APS-C, Micro Four Thirds, medium format and more.

FEATURES
• Live equivalent focal length
  Your main format is shown large, with up to four other formats below it, along with the angle of view (diagonal or long edge).
• Zoom slider with focal-length ticks
  The slider shows ticks in your main format (24, 35, 50, 85 mm…). Tap a number to jump to that focal length, or pinch to zoom.
• Sensor formats
  Presets for full frame, APS-C (Sony / Nikon / Fujifilm and Canon), Micro Four Thirds, 44×33 medium format, 645 and 6×6. Add your own camera by entering its sensor size.
• Diagonal or long-edge basis
  Match the diagonal angle of view (the same idea as the "35mm equivalent" in iPhone photos) or the long-edge width in landscape.
• Capture with records
  Photos are saved with the 35mm equivalent focal length (EXIF) and a caption such as "FF 24mm | APS-C 16mm (diag, FocalCalc)", which you can see in the Photos app info panel.
• Optional burn-in
  Draw the values into a corner of the photo. Choose the position and text size, and optionally keep a copy without the text.
• Save as HEIC or JPEG

PRICING
• Free to download, with a 7-day free trial of every feature.
• To keep using it after the trial, purchase the app for ¥300 (one-time — there is no subscription).
• The focal length calculator (enter a focal length and see it in every format) is free to use at any time, with or without a purchase.

PLEASE NOTE
• FocalCalc is a tool for checking and recording the angle of view. It cannot use all of the image processing of the built-in Camera app (such as Night mode), so image quality and low-light results are lower than with the Camera app.
• The values are estimates calculated from the angle of view reported by the iPhone. Lens distortion and device differences may cause small differences from real cameras.
• The app is available in English and Japanese and works in landscape orientation.

PRIVACY
FocalCalc does not collect any data. It makes no network connections and only adds photos to your library when you take them.

REQUIREMENTS
iPhone with iOS 17 or later

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 7-Day Free Trial | Free | one-time |
| FocalCalc Full Version | $1.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-09-24

No release notes.

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## More apps by Takumi Komatsu

- [Road Aware](https://appshunter.io/ios/app/road-aware/id6806567547)

All apps by Takumi Komatsu: https://appshunter.io/developer/6805753098

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-28.*