COGO Calculator — Bearing, Distance & Area
Plane coordinate geometry on grid coordinates: join two points for bearing and distance, radiate a new point from a bearing and distance, and compute polygon area by the shoelace method — with the grid-versus-ground area note carried on every area result and the full working shown for each step. Bearings accept decimal degrees or DMS.
Free advisory field tool — every result is computed in your browser from the inputs you provide and is advisory and unverified, not for survey deliverables. Where a published guideline applies, results only ever read “within guideline” or “exceeds guideline — review”. The full working is shown for every calculation so each step can be re-checked. Registered surveyor confirmation required before reliance.
Enter both points — the bearing, distance and full working appear here.
Grid note: bearings are grid bearings (from grid north, clockwise) and joins, radiations and areas are plane computations on grid coordinates. Where ground values are needed, apply the combined scale factor — distances divide by CSF, areas by CSF² (see the Grid ↔ Ground tool in the related links).
Advisory output — confirm independently before reliance.
Safety & scope
SurveyMarkup helps prepare and review working information. Every professional decision remains with the registered surveyor, and original data and final outputs require qualified review.
Assistance only - professional review remains required.