Coordinate & Datum Converter — MGA2020
Convert between GDA2020 geographic coordinates and the MGA2020 grid — zone auto-detected from longitude with a manual override, point scale factor and grid convergence shown for every conversion. GDA94 inputs require an explicit data-lineage and transformation-method selection. Inputs accept decimal degrees or DMS, and every result carries a copyable method statement of exactly what was computed.
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.
DD or DMS — e.g. -37.6528 or 37°39′10.1″ S
DD or DMS — e.g. -37.6528 or 37°39′10.1″ S
Auto-detects from longitude — override for work held in an adjacent zone.
Enter a latitude and longitude to convert — the result, its full working and the method statement appear here.
Datum note: conformal calculation is available only for national or otherwise conformal-compatible GDA94 lineage. Localised control can contain network distortion and is blocked here unless an official NTv2 grid workflow is used. This browser tool does not implement that grid method and never substitutes a conformal result for it.
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.