Coordinate Precision Estimator (Decimal Places to Metres)
Converts latitude/longitude decimal places into an approximate ground precision in metres.
Enter Values
Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.
How to use this calculator
- Enter the number of decimal places.
- Enter the latitude (longitude precision shrinks toward the poles).
- Press Calculate.
How it works
Estimates how many metres one unit in the last decimal place of a coordinate represents. 1° of latitude ≈ 111.32 km; longitude scales by cos(latitude).
Worked example
5 decimal places. ≈ 1.1 m of latitude precision; longitude is smaller away from the equator.
Frequently asked questions
How many decimals do I need?
5 places ≈ 1 m, 6 places ≈ 0.1 m. More than that rarely helps unless you have survey-grade GNSS.
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Cite this tool
Zerdly. (2026). Coordinate Precision Estimator (Decimal Places to Metres). Retrieved from https://www.zerdly.com/tools/coordinate-precision-estimator-decimal-places-to-metres/
Tip: Enter any known values to calculate the remaining results.
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