Use this virtual-reality calculation for a first-order display, optics, tracking, rendering, or latency estimate when all stages and units are explicitly defined.

Target Pixels Per Degree (px/deg)

Required number in px/deg.

Horizontal Fov Degrees (deg)

Required number in deg.

The cited overview of Virtual reality supplies background for the terminology and domain context used by this tool.^[1]

Minimum integer horizontal pixel count for a target nominal pixels-per-degree and horizontal field of view. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Horizontal Pixels (px)

Returned number in px.

• Lens calibration, per-eye geometry, display scanout, asynchronous pipelines, tracking filters, workload variation, user anatomy, and device firmware can make measured VR behavior differ from a serial model.
• Target Pixels Per Degree must be at least 0.
• Horizontal Fov Degrees must be at least 0.
• Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.

Validate the estimate on the target headset with calibrated motion, optical, frame-timing, and latency measurements under a representative workload.

• Display Pixels Per Degree

  Nominal horizontal panel pixels per optical degree for one eye; ignores lens distortion and usable-pixel losses.

• Reprojection Error Pixels

  Approximate horizontal reprojection error in pixels from signed angular error and nominal pixels per degree.

• Dynamic Resolution Scale Factor

  Uniform linear render-scale factor needed for a target pixel budget relative to base resolution.