What this result means
A pace that feels right at 12 °C may be optimistic at 28 °C with humidity, a headwind, or at 1,500 m elevation. This board stacks documented slowdown factors on one cool-weather anchor pace.
Temperature and humidity use the lab’s heat model. Wind accepts signed metres per second — positive headwind, negative tailwind. Altitude slows sea-level goal pace for race elevation.
Outputs are planning estimates, not guarantees. Fitness, course profile, and acclimation still dominate.
5:00/km goal at 12 °C, calm, sea level stays 5:00/km. At 28 °C and 70% humidity the same anchor might read several seconds per km slower before wind or altitude.
A 2 m/s headwind adds cost; −2 m/s tailwind eases pace. Combine all inputs to see one adjusted number.
Calculation method
Heat/humidity/wind/altitude heuristics documented on /methodology. Factors multiply on the anchor pace; displayed pace rounds to the nearest second.
Does not fetch live weather — enter conditions manually or use race weather for a forecast.
Course shade, hydration, and heat acclimation are not modeled.
Frequently asked questions
How do heat and humidity affect pace?
Warm air and high humidity reduce cooling efficiency. The board applies documented slowdown factors to your cool-weather anchor pace.
How do I enter headwind vs tailwind?
Use signed metres per second: positive slows pace (headwind), negative eases pace (tailwind).
Does altitude adjustment replace hill pacing?
No. Altitude here is average race elevation vs sea level. Steep grades belong on grade-adjusted pace or hill tools.
Can I get a forecast automatically?
Use the race weather calculator for location-based forecast input; this board is manual entry.