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

Measured Latency Milliseconds (ms)

Required number in ms.

Reserve 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]

Prediction horizon from measured motion-to-photon latency plus a user-supplied timing reserve. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Prediction 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.
• Measured Latency Milliseconds must be at least 0.
• Reserve 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.

• Prediction Latency

  Prediction horizon in milliseconds from pose-measurement timestamp to target display timestamp on the same clock.

• Display Latency

  Display latency estimate from scanout delay and pixel response time.