Downhill Pace Adjustment Calculator

About this calculator

Running downhill costs less metabolic energy than running on flat ground at the same effort, because gravity does part of the work that would otherwise come from muscular force — so the same physiological effort produces a faster pace on a descent than the flat-ground pace most runners use to judge how hard they’re working. Grade-adjusted pace models convert a flat-equivalent effort into the actual pace you should expect (or should aim to run) at a given downhill gradient.

Trail and mountain runners, and road racers on downhill-net courses like Boston, use this adjustment to avoid two common mistakes: judging effort purely by pace and unknowingly overexerting on descents, or conversely leaving time on the table by running descents too conservatively at flat-ground effort. It’s also used in reverse, after a race, to convert an actual downhill split back into an equivalent flat-ground effort for comparing performances across different courses.

This calculator takes your flat running pace and the downhill grade and returns the equivalent downhill pace, plus the time you save over the descent compared to holding flat-ground pace.