Maidenhead Grid Square Locator
Find your Maidenhead grid square from latitude and longitude (or your device location), and decode any grid.
How Maidenhead locators work
- Field (2 letters, A–R): 20° of longitude × 10° of latitude.
- Square (2 digits, 0–9): 2° × 1°.
- Subsquare (2 letters, a–x): 5′ × 2.5′ — about 7 × 4.6 km at mid latitudes.
Longitude comes first in each pair, counted east from 180° W; latitude is counted north from 90° S. Your location never leaves your browser — the calculation runs on your device.
Frequently asked questions
How many characters of my grid should I give?
Four characters (for example FN20) is standard for VHF/UHF contests and most logging. Six characters narrows it to a few kilometres and is common on microwave bands and for satellite and rover work.
Why do some contests use my grid square?
VHF and up contests score multipliers by grid square, and distance-based awards such as VUCC count the grids you have worked.