Running Effort Calculator
Convert between different effort levels and paces. Understand how environmental factors like heat, wind, and humidity affect your perceived effort and actual pace.
Reference Distance
Effort Level
100%
Target Distance
adjusted time = (T_ref ÷ D_ref) × (100 ÷ effort%) × D_target
(linear pace scaling — 80% effort means 80% of reference speed)Enter a reference time above and your effort-adjusted target time appears here instantly. Or start from an example:
Percent effort here scales pace linearly relative to your reference performance — it is a pacing guide for workouts, not a physiological measurement like heart rate or %VO2 max.
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