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Conversion of camera intrinsic parameters (pixels to meter)

I am currently developing a project involving a camera and a distance sensor, but I stumbled on a problem, I have obtained the camera's parameter through calibration step , however I discovered that the obtained parameters are measured in pixels (e.g. focal length [860, 899], etc).

Is there any formula to convert this to unit distance (meter) ? I tried a few calibration techniques but all returns the same measurement in pixel.