GPX Elevation Gain Pace Calculator
Adjust your flat-ground pace for a route's elevation gain using Naismith's rule to get a realistic hilly finish time.
How it works
Climb time = elevation gain ÷ climb rate × 10 min · Total = distance × flat pace + climb time
Naismith's rule adds a fixed time penalty for every metre climbed on top of your flat-ground pace — the classic version charges one extra minute for each 10 metres of ascent. This calculator keeps your flat pace for covering distance and layers the climb penalty on top, so a hilly GPX route reads far slower than its raw distance suggests. Descents are treated as neutral here, which is the standard conservative assumption for planning.
Worked example
A 10 km route with 600 m of gain at a 6:00 min/km flat pace: flat time is 10 × 6 = 60 min, climb time is 600 ÷ 10 = 60 min, so the total is about 2 hours — an effective pace near 12:00 min/km.
Sources: Naismith's rule (Wikipedia)
Frequently asked questions
What is Naismith's rule?
A 1892 mountaineering rule of thumb: allow your normal pace for horizontal distance, then add one extra minute for every 10 metres of vertical ascent. It is widely used for planning hikes and trail runs.
Does it account for downhill?
This calculator treats descent as neutral, which is the common conservative choice. Steep descents can actually slow you down, while gentle ones speed you up — refinements like Tranter's corrections adjust for that, but plain Naismith keeps it simple.
Why is my hilly time so much slower?
Because vertical gain is expensive: 600 m of climbing can add as much time as an hour of flat running. On mountainous routes the climb penalty often rivals or exceeds the flat-distance time.
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This calculator is for educational purposes. Double-check important results before acting on them.