GPS Geofence Radius Calculator
Pick the right geofence size for your site. Most teams either draw the boundary too tight (false rejections every morning) or too loose (off-site check-ins count). This calculator gives you a defensible starting radius based on site type, device mix, and environment.
1. What type of site?
2. Device mix
3. Surrounding density
4. Include parking and approach area?
Why These Numbers
Modern Phones Are Accurate to 5-10 Metres Outdoors
In clear conditions with a recent device, GPS accuracy lands inside 10 metres. The geofence has to be larger than the accuracy band, or you reject legitimate workers because of natural GPS drift.
Accuracy Degrades Indoors and in Urban Canyons
Inside buildings, between tall structures, or under heavy cloud cover, accuracy can drop to 50 metres or more. Tight geofences fail at the start of every shift in these environments. The calculator adds buffer for dense urban or indoor sites.
Parking and Approach Areas Matter
Workers usually open the app in the parking lot or walking up. A geofence drawn tight around the building rejects everyone before they enter. Including a 20-metre approach buffer eliminates the false rejections without letting off-site check-ins slip through.
Geofence Alone is Not Enough
A worker can stand just inside the boundary, check in for a colleague, and walk away. Or hand the phone to someone on site. Combine geofence with selfie identity capture and project-linked records so location is never the only signal.
Deploy Geofences Without False Rejections
CrewForce360 ships geofence-enforced check-in with operator-configurable radii, buffer zones, selfie verification, and project linkage. Calibrate in an afternoon, run cleanly from the next shift.