Race Venue
Race Distance
Your Altitude TimeTime at 5,280 ft
Sea Level Equivalent

Enter your altitude race time and the sea-level equivalent appears here.

sea-level time = altitude time ÷ factor(altitude, distance)

(empirical quartic fit in ln(altitude) and ln(distance) — no adjustment at or below 750 m)

Individual altitude response varies widely with acclimatization, event duration, and genetics — treat the adjustment as a typical value, not a personal guarantee.