Free surveying calculators
The same math as the COGO app, checked against the same known answers. Everything runs in your browser. Nothing you type is sent anywhere.
Traverse closure & area
Enter bearings and distances. Get misclosure, precision ratio, area and a plot.
Open calculator →Horizontal curve
Any two of radius, delta, arc, tangent and chord give the full curve.
Open calculator →Bearing ↔ azimuth
Quadrant bearings to azimuths and back, with back bearings, in DMS or decimal.
Open calculator →Survey unit converter
US survey and international feet, chains, links, rods, varas, acres and hectares.
Open calculator →Need the rest of the toolkit?
The app has more than 40 tools, including intersections, State Plane and UTM, vertical curves, a level book and sideshot reduction. It saves your jobs and points and exports CSV, DXF and PDF, all offline.
Get the iPhone and iPad app