Trail Running Pace Calculator
Adjust trail running pace for elevation gain and technical terrain.
About Trail Running Pace Calculator
Trail pace suffers from two independent penalties: climbing, which costs roughly a minute per hundred metres of gain, and terrain, which slows every kilometre regardless of gradient. Grade adjusted distance is what makes trail and road efforts comparable, and a hilly trail half marathon can equate to a road marathon in effort.
Formula
Trail Running Pace
Trail time = distance × flat pace × technical factor + elevation gain time
- technical factor
- Multiplier for rocks, roots and footing difficulty
- grade adjusted distance
- The road distance requiring the same effort
Worked example
With the default values below, Trail Running Pace Calculator returns Adjusted Trail Pace of 6.2214. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Distanceminimum 0.001 km
- 21 km
- Elevation gainminimum 0 m
- 900 m
- Flat road paceminimum 0.1 min/km
- 5 min/km
- Terrain technical factoraccepts 1–2.5 x
- 1.15 x
Results
- Adjusted Trail Pace
- 6.2214 min/km
- Estimated Finish Time
- 2:10:39
- Time Added by Climbing
- 9.90 min
- Grade Adjusted Equivalent Distance
- 26.130 km
- Average Gradient
- 4.286%
Step by step
- 1Values used
- 2Trail Running Pace
- 3Adjusted Trail Pace= 6.2214 min/km
- 4Estimated Finish Time= 2:10:39
- 5Time Added by Climbing= 9.90 min
- 6Grade Adjusted Equivalent Distance= 26.130 km
- 7Average Gradient= 4.286
Assumptions and limits
- The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, fees or charges or compounding frequency into account.
- Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
- These figures are estimates based on population-average formulas and are intended for training and recreational planning only. They are not medical advice. Consult a qualified health professional before starting or changing an exercise programme, particularly if you have an existing medical condition.
- This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
These figures are estimates based on population-average formulas and are intended for training and recreational planning only. They are not medical advice. Consult a qualified health professional before starting or changing an exercise programme, particularly if you have an existing medical condition.
Frequently Asked Questions
How is Trail Running Pace calculated?
Trail time = distance × flat pace × technical factor + elevation gain time Trail pace suffers from two independent penalties: climbing, which costs roughly a minute per hundred metres of gain, and terrain, which slows every kilometre regardless of gradient.
Why does Trail Running Pace matter?
Grade adjusted distance is what makes trail and road efforts comparable, and a hilly trail half marathon can equate to a road marathon in effort.
What values do I need to enter?
This calculator takes 4 inputs: Distance, Elevation gain, Flat road pace, Terrain technical factor. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.