Health & Fitness Tools

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Cardio

Heart Rate Zone Calculator

Calculate your 5 training heart rate zones using Karvonen or percentage method.

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Cardio

VO2 Max Estimator

Estimate your VO2 max from a timed run or resting heart rate.

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Cardio

Calories Burned

Estimate calories burned during any activity using MET values.

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Cardio

Running Pace Calculator

Convert between pace, speed, and finish time for any running distance.

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Cardio

Max Heart Rate Calculator

Estimate your maximum heart rate using 6 validated scientific formulas.

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Cardio

Steps to Calories

Convert daily step count to estimated calories burned.

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Cardio

Race Time Predictor

Predict finish times across distances from 5K to marathon.

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Cardio

Rowing Pace Calculator

Convert between 500m split time, watts, and calories on the rowing machine.

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Cardio

HR Recovery Test

Assess cardiovascular fitness from your 1-minute heart rate recovery.

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Cardio

Running Economy

Calculate your running economy and compare to population norms.

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Cardio

HIIT Workout Builder

Design interval workouts with customizable work-rest ratios.

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Cardio

Walking Fitness Test

Estimate fitness from the Rockport 1-mile walk test.

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Cardio

Race Taper Planner

Plan your pre-race taper with optimal volume reduction by week.

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Cardio

Breath Hold Test

Assess CO2 tolerance and stress resilience with the BOLT score.

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Cardio

Fat Oxidation Zone

Find your peak fat-burning intensity zone.

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Cardio

Lactate Threshold Estimator

Estimate lactate threshold from race pace or field tests.

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Cardio

Cooper 12-Min Run Test

Perform and score the classic Cooper aerobic fitness test.

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Cardio

Beep Test Calculator

Convert beep test levels to VO2 max and fitness rating.

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Cardio

Endurance Training Zones

5-zone endurance training system with pace and HR targets.

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Cardio

Cycling FTP Calculator

Estimate Functional Threshold Power from field tests.

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Cardio

Swim Pace Calculator

Calculate swim paces and predict race times across distances.

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Cardio

Jump Rope Calorie Burn

Estimate calories burned jump roping at different intensities.

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Cardio

Hiking Calorie Calculator

Calories burned hiking with elevation and pack weight.

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Cardio

Swim Fitness Test

Assess swim fitness with timed distance tests.