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

Scanout Milliseconds (ms)

Required number in ms.

Pixel Response Milliseconds (ms)

Required number in ms.

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

Display latency estimate from scanout delay and pixel response time. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Display Milliseconds (ms)

Returned number in ms.

• 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.
• Scanout Milliseconds must be at least 0.
• Pixel Response Milliseconds 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.

• Motion To Photon Latency

  Serial motion-to-photon estimate from sensing, pose processing, rendering, compositing, scanout and pixel response.

• Total System Latency

  Serial latency estimate from tracking, rendering and display stages; excludes unmodelled parallel overlap.

• Display Pixels Per Degree

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