The read-only rawValueToMeters property of the XRDepthInformation interface contains the scale factor by which the raw depth values must be multiplied in order to get the depths in meters.

For CPU depth information, see also the XRCPUDepthInformation.getDepthInMeters() method.

A number.

Use XRFrame.getDepthInformation() (CPU) or XRWebGLBinding.getDepthInformation() (WebGL) to obtain depth information. The returned objects will contain the rawValueToMeters scale factor, which can be used for further calculations.

For CPU depth information and a buffer that has "luminance-alpha" format:

const uint16 = new Uint16Array(depthInfo.data);
const index = column + row * depthInfo.width;
const depthInMeters = uint16[index] * depthInfo.rawValueToMeters;

(Use Float32Array for a "float32" data format.)

Note that the depth in meters is in depth-buffer coordinates. Additional steps are needed to convert them to normalized view coordinates, or the XRCPUDepthInformation.getDepthInMeters() method can be used.