# Focal Length Calculator

> Focal length calculator: compute lens focal length from object and image distances for cameras and optics. Free, editable units, runs locally in your browser.

- **Canonical URL:** https://boringtoolskit.com/focal-length-calculator/
- **Category:** Photo & Video
- **Evidence level:** catalogue
- **Reviewed:** July 26, 2026
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

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