Running Calculators
Running Pace Calculator
Calculate pace, time, and distance for any running workout or race.
Use Calculator →Race Pace Calculator
Get your ideal race pace and split times for any distance.
Use Calculator →Race Time Predictor
Predict your finish time for 5K, 10K, half marathon, and marathon.
Use Calculator →Pace Converter
Convert between min/km, min/mile, km/h, and mph.
Use Calculator →Treadmill Pace Calculator
Convert treadmill speed to outdoor equivalent pace.
Use Calculator →Run/Walk Calculator
Plan run/walk intervals for training and racing.
Use Calculator →Distance Converter
Convert between miles, kilometers, and meters.
Use Calculator →KM to Miles Converter
Quick conversion between kilometers and miles.
Use Calculator →Heart Rate Calculators
Heart Rate Zone Calculator
Calculate your 5 training zones based on max HR or LTHR.
Use Calculator →Max Heart Rate Calculator
Estimate your maximum heart rate using multiple formulas.
Use Calculator →Target Heart Rate Calculator
Find your target HR for fat burning or cardio training.
Use Calculator →Karvonen Formula Calculator
Calculate zones using heart rate reserve method.
Use Calculator →LTHR Zone Calculator
Training zones based on lactate threshold heart rate.
Use Calculator →Lactate Threshold Calculator
Estimate your lactate threshold pace and heart rate.
Use Calculator →Cycling Calculators
FTP Calculator
Calculate Functional Threshold Power and training zones.
Use Calculator →Bike Gearing Calculator
Calculate gear ratios, speed, and cadence relationships.
Use Calculator →Cadence Speed Calculator
Find your speed based on cadence and gear ratio.
Use Calculator →Power to Weight Calculator
Calculate your watts/kg ratio for climbing performance.
Use Calculator →Watts to Calories Calculator
Convert cycling power output to calories burned.
Use Calculator →FTP Improvement Calculator
Track and project your FTP gains over time.
Use Calculator →Performance & Fitness
VO2 Max Calculator
Estimate your maximal oxygen uptake from race times.
Use Calculator →Cooper Test Calculator
Calculate VO2 max from 12-minute run distance.
Use Calculator →Calories Burned Calculator
Calculate calories burned during running and walking.
Use Calculator →BMI Calculator
Calculate Body Mass Index and healthy weight range.
Use Calculator →Training Load Calculator
Calculate TSS, ATL, CTL, and training stress balance.
Use Calculator →Recovery Calculator
Estimate recovery time based on workout intensity.
Use Calculator →Sweat Rate Calculator
Calculate your sweat rate for hydration planning.
Use Calculator →Aerobic/Anaerobic Calculator
Determine your aerobic and anaerobic thresholds.
Use Calculator →Interactive Tools & Timers
Interval Timer
Customizable interval workout timer with audio cues and presets.
Start Timer →Tabata Timer
Classic 20/10 Tabata protocol with calorie tracking and history.
Start Timer →Pace Band Generator
Create printable wristband splits for race day pacing.
Generate Band →Progress Tracker
Track weight, FTP, pace, and more with charts and goals.
Track Progress →Body Composition Calculator
Calculate body fat % and lean mass using Navy method.
Use Calculator →Age-Graded Calculator
Compare race times across ages using WMA tables.
Use Calculator →Need a Complete Training Plan?
Generate a personalized training plan for running, cycling, triathlon, or Hyrox. Export directly to your calendar.
Build Your Training Plan →