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

Display Refresh Hertz (Hz)

Required number in Hz.

Rendered Frames Per Second (fps)

Required number in fps.

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

Generated in-between display frames per second when render rate is below display refresh; assumes exact rate division. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Synthetic Frames Per Second (fps)

Returned number in fps.

• 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.
• Display Refresh Hertz must be at least 0.
• Rendered Frames Per Second 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.

• Frame Rate From Refresh

  Rendered frames per second when each rendered frame is displayed for a fixed number of display refreshes.

• Frame Time Budget Ms

  Milliseconds available per display refresh from target refresh rate in hertz.

• Geometry Throughput Triangles Per Frame

  Average triangles rendered per frame from triangles per second and rendered frames per second.