Coordinate Precision Estimator (Decimal Places to Metres)
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserIntermediate
Enter Values
Enter your values and press Calculate to see results.
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.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.