Naismith's Rule — Walking Time Calculator
Baseline: 5 km/h on flat + 10 min per 100 m ascent. Optional descent & terrain factors.
0 h 00 min
Flat travel
0 h 00 min
Uphill add
0 h 00 min
Downhill add
0 h 00 min
Terrain factor
×1.00
Rest
0 min
Avg pace
—
Flat travel speed can be adjusted below (default 5 km/h).
Classic Naismith adds 10 min per 100 m of ascent.
m
Set a descent penalty below if you want to account for steep or rough downhills.
Multiplies the final time to reflect footing and faff.
km/h
Default 5 km/h (~12 min/km, ~3 mph).
min / 100 m
Classic Naismith = 10.
min / 100 m
Set 5–10 to penalise steep/technical descents.
min
Formula: time = (distance / flatSpeed) + (ascent/100)×(climbPenalty/60) + (descent/100)×(descentPenalty/60), then × terrain factor, then + rest.
Tip: toggle units to suit your map (km/mi & m/ft). URL sharing preserves your inputs.
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