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Naismith's Rule — Walking Time Calculator
Baseline: 5 km/h on flat + 10 min per 100 m ascent. Optional descent & terrain factors.
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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
—
Distance
km
miles
Flat travel speed can be adjusted below (default 5 km/h).
Total Ascent (uphill)
m
ft
Classic Naismith adds 10 min per 100 m of ascent.
Total Descent (optional)
m
Set a descent penalty below if you want to account for steep or rough downhills.
Terrain factor
Typical path (×1.00)
Rough/uneven (×1.10)
Very rough/heath/scree (×1.20)
Easy track/road (×0.90)
Multiplies the final time to reflect footing and faff.
Flat speed
km/h
Default 5 km/h (~12 min/km, ~3 mph).
Climb penalty
min / 100 m
Classic Naismith = 10.
Descent penalty (optional)
min / 100 m
Set 5–10 to penalise steep/technical descents.
Spacer
Add rest time
min
Reset
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Formula:
time = (distance / flatSpeed) + (ascent/100)×(climbPenalty/60) + (descent/100)×(descentPenalty/60)
, then × terrain factor, then + rest.