Health & Fitness / Train the zones.
Cardio & Zones
Max HR (Tanaka), Karvonen heart-rate zones, pace ↔ speed conversion, and VO2max from 5K time for r/running, r/cycling, and r/Rowing.
8 tools available
Max Heart Rate Calculator (Tanaka)
Estimate HRmax from age with the Tanaka formula.
Open tool
Heart Rate Zone Calculator (Karvonen)
See your 5 training zones from resting HR and HRmax.
Open tool
Pace Converter (min/km ↔ min/mi ↔ km/h ↔ mph)
Convert running pace between metric and imperial units.
Open tool
VO2max Estimator from 5K Time
Estimate VO2max and equivalent race times from a recent 5K.
Open tool
Heat Index Calculator (NWS Rothfusz)
Get the felt-air temperature from heat and humidity.
Open tool
Running Pace Zones Calculator
Get easy / tempo / threshold / interval / repetition paces from a recent race or threshold pace.
Open tool
Race Time Predictor (Riegel)
Predict your 5K / 10K / half / marathon time from any other race result.
Open tool
Race Splits Calculator
Get per-mile or per-km splits to hit a goal finish time.
Open tool