Pacing and Distance

Distance from pace count with terrain correction; reference table per stride length.

Run the calculator

Example

You enter

Calibration distance (ft) 100
Calibration paces 38
Current paces 120
Terrain flat

You get

Pace length 2.63 ft
Distance (ft) 315.79
Distance m 96.25
Terrain factor 1

Details, formula, and sources

Distance = pace_count × stride_length × terrain_factor. Terrain factors: flat 1.0 / rolling 0.9 / steep 0.8 / brush 0.7 / snow 0.6.

U.S. Army FM 3-25.26 (Map Reading and Land Navigation) and FM 21-26 (predecessor) by name.

U.S. Army field manuals free at army.mil and at archive.org.

Geometry is not forecasting. Avalanche advisory and incident commander govern.

Field names used by the API: calibration_distance_ft, calibration_paces, current_paces, terrain, pace_length_ft, distance_ft, distance_m, terrain_factor

Terrain factors flat 1.0 / rolling 0.9 / steep 0.8 / brush 0.7 / snow 0.6FM 3-25.26 typical