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

Left pupil (mm)

Required number in mm. Left pupil center position along the measurement axis.

Right pupil (mm)

Required number in mm. Right pupil center position along the measurement axis.

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

Derive interpupillary distance from the measured left and right pupil center positions. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

IPD (mm)

Returned number in mm. Absolute distance between pupil centers.

• 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.
• 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.

• IPD Adjustment Calculator

  Compute the lens separation offset between a user's interpupillary distance and the headset default.

• Chromatic Aberration Correction Calculator

  Compute the radial scale correction that removes measured color channel separation at a reference radius.

• Foveated Rendering Gain

  Ideal pixel-work reduction factor from full-resolution pixel workload divided by foveated workload; not measured FPS gain.