Free calculator

Lens & field-of-view calculator

What field of view this lens gives, how wide it covers at the chosen distance, and how much pixel density is left on target.

Standards & referencesIEC/EN 62676-4:2014 — DORI framework

Sensor format (inches)
1920 = 1080p · 2560 = 4 MP · 3840 = 4K
HFOV—
Scene width—
Pixel density—
DORI level — IEC/EN 62676-4:2014—

How it is calculated

  1. The field of view comes from the lens geometry: HFOV = 2 · atan(sensor width ÷ (2 × focal length)).
  2. Scene width is the base of the triangle at that distance: width = 2 · distance · tan(HFOV ÷ 2).
  3. Density is horizontal resolution divided by the covered width, in pixels per metre — and that is the value IEC/EN 62676-4 classifies.

A decision-support estimate. For full sizing — on the real floor plan, both standards in parallel, theoretical and corrected, and the vendor-neutral spec — use B-PLAN.

Open B-PLAN →

The four calculators, in order

Each answers one question and hands its result to the next. Together they follow the same path B-PLAN takes on the real floor plan.

1Camera requirementWhat the system has to be able to see
2Lens & field of viewWhich optics meet that requirementYou are here
3PoE budgetWhat power the installation needs4StorageWhat capacity holds the retention period