10-20 Distance Mapper

Calculate precise distances (in cm) for standard 10-20 system placements based on primary head measurements.

Patient Measurements (cm)

JavaScript Required: This tool requires JavaScript to perform calculations in the browser. For manual calculation, remember the 10-20 rule: points are placed at 10%, 20%, 20%, 20%, 20%, 10% of the total distance along the sagittal and coronal planes.

Calculated Distances

Enter measurements and click calculate to view precise millimeter distances.

10-20 Distance Mapper

Patient Measurements (cm)

Calculated Distances

Sagittal Plane (Midline)

Coronal Plane