Abstract: A field portable site survey system includes a portable computer interfaced directly with a rangefinder of the type which needs no reflector, e.g. a rangefinder which receives a signal from a feature of a survey site by backscattering of an incident beam such as a laser beam. A computer program causes the computer to prompt an operator to use the range finder to take measurements appropriate for calculation of the volume of a survey site according to its shape or of its component shapes. The computer calculates the volume in realtime. If the density has been entered into the computer weight will also be calculated.