Calculators & Converter

Compute an unknown station position from three control points using observed angles. Includes danger circle detection.

Adjust a closed traverse by distributing misclosure proportionally to leg lengths.

Sum traverse legs to find linear misclosure, misclosure components, perimeter, and relative precision.

Convert between polar (bearing/distance) and rectangular (easting/northing) coordinates.

Compute the intersection of two rays defined by known stations and observed bearings.

Calculate area and perimeter of a polygon from coordinate list using the shoelace formula.

Compute setting-out coordinates for horizontal curves by chainage and offset.

Determine the center of a circular column from three face measurements.

Check structural survey observations against NSSS and NCSC tolerance tables.

Compute perpendicular distance from a 3D point to a defined plane. Deviation check for as-built verification.

Compute transformation parameters and transformed coordinates between local and national grids.

Convert coordinates between OSGB36, ETRS89, UTM, and local grids.

Convert bearings between DMS (degrees, minutes, seconds) and decimal degrees.

Convert between units of angle (grad, DMS, decimal), distance (m, ft, chains), and area.