Running Calculators

Free calculators for pace, heart rate zones, race predictions, and smarter training.

Running Pace

Convert pace, time, and distance
for races and workouts.
Calculate Pace

Training Pace

Find your ideal training paces
from easy runs to intervals.
Find Training Paces

Heart Rate Zones

Calculate your HR training zones
with the Karvonen method.
Calculate Zones

Race Time Predictor

Predict your race times for 5K, 10K,
half marathon, and marathon.
Predict Race Time
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