Performance calculators for runners, cyclists, and athletes: pace, speed, intervals, and race projections.
Running Pace Calculator
Calculate average running pace from distance and total time
Cycling Pace Calculator
Calculate average cycling pace from distance and total time
Rowing Pace Calculator
Calculate average rowing pace from distance and elapsed time
Swim Pace Calculator
Calculate average swim pace from distance and total time. Useful for pool, open-water, triathlon, and endurance pacing.
Average Speed From Distance Time Calculator
Calculate average speed in km per hour from distance and time
Race Time Improvement Percentage Calculator
Calculate percentage improvement between race times
Training Load Change Calculator
Calculate percentage change in training load values
Interval Session Total Time Calculator
Calculate total interval workout time from interval length and number of intervals. Fast planning for running, cycling, swimming, and circuits.
Race Time Projection Riegel Calculator
Project a race time for a target distance using the Riegel formula. Useful for 5K, 10K, half marathon, and marathon planning.
Interval Workout Total Time With Rest Calculator
Calculate full interval workout duration including warmup and cooldown
Training Pace Zones From Threshold Calculator
Estimate easy tempo and interval paces from threshold pace
Average Speed From Split And Rest Calculator
Compare moving speed and overall speed including stoppage time
Max Heart Rate Calculator
Estimate your maximum heart rate using the Tanaka formula based on age
Target Heart Rate Calculator
Find your target heart rate at a given intensity using the Karvonen method
Heart Rate Zone Calculator
Calculate all five heart rate training zones from your maximum heart rate
Fat Burning Zone Calculator
Find the heart rate range that maximizes fat oxidation during cardio
Heart Rate Recovery Calculator
Use this heart rate recovery calculator with clear inputs, formula notes, a worked example, common mistakes, and related calculators.
Running Calorie Calculator
Use this running calorie calculator with clear inputs, formula notes, a worked example, common mistakes, and related calculators.
Cycling Calorie Calculator
Estimate calories burned cycling based on weight duration and average speed
Walking Calorie Calculator
Use this walking calorie calculator with clear inputs, formula notes, a worked example, common mistakes, and related calculators.
Swimming Calorie Calculator
Estimate calories burned swimming based on weight duration and effort level
Steps To Calories Calculator
Use this steps to calories calculator with clear inputs, formula notes, a worked example, common mistakes, and related calculators.
5K Pace Calculator
Use this 5k pace calculator with clear inputs, formula notes, a worked example, common mistakes, and related calculators.
Half Marathon Pace Calculator
Calculate average pace per km or mile for a half marathon from total time
Marathon Pace Calculator
Use this marathon pace calculator with clear inputs, formula notes, a worked example, common mistakes, and related calculators.
VO2 Max Running Calculator
Estimate VO2 max from the Cooper 12-minute run distance. Includes formula, example, and interpretation notes.
Stride Length Calculator
Estimate stride length from height gender and cadence for pace and gait analysis
Steps To Km Calculator
Use this steps to km calculator with clear inputs, formula notes, a worked example, common mistakes, and related calculators.
Steps To Miles Calculator
Convert a step count to miles using stride length in inches
One Rep Max Calculator
Estimate your one rep max using the Epley formula from any set weight and reps
Bench Press 1RM Calculator
Estimate bench press one rep max using the Epley formula
Wilks Score Calculator
Calculate Wilks score to compare powerlifting strength across different body weights
Batting Average Calculator
Calculate baseball batting average from hits and official at-bats. Includes formula, example, and interpretation.
ERA Calculator
Use this era calculator with clear inputs, formula notes, a worked example, common mistakes, and related calculators.
Slugging Percentage Calculator
Calculate slugging percentage from hit breakdown and total at-bats
On Base Percentage Calculator
Calculate on-base percentage from hits walks and hit by pitch statistics
WHIP Calculator
Calculate pitcher WHIP from walks and hits allowed per innings pitched
True Shooting Percentage Calculator
Calculate true shooting percentage from points, field goal attempts, and free throw attempts. Get the TS% formula, example, and shooting efficiency interpretation.
Effective Field Goal Percentage Calculator
Use this effective field goal percentage calculator with clear inputs, formula notes, a worked example, common mistakes, and related calculators.
Basketball Game Score Calculator
Calculate John Hollinger's game score stat from a basketball box score
Winning Percentage Calculator
Calculate winning percentage from wins losses and ties for any sport or team
Elo Rating Calculator
Calculate Elo rating change after a match result using the standard K-factor formula
Goalie Save Percentage Calculator
Calculate goalie save percentage from saves and total shots on goal
Goals Against Average Calculator
Calculate goalie goals against average from goals allowed and minutes played. Includes formula, example, and interpretation.
NFL Passer Rating Calculator
Use this nfl passer rating calculator with clear inputs, formula notes, a worked example, common mistakes, and related calculators.
Cycling Wattage Calculator
Estimate cycling power output in watts from rider weight speed and road gradient
Bike Cadence Calculator
Calculate pedalling cadence in RPM from speed wheel size and gear ratio
Cycling Heart Rate Zones Calculator
Use this cycling heart rate zones calculator with clear inputs, formula notes, a worked example, common mistakes, and related calculators.
E-Bike Range Calculator
Estimate e-bike range from battery capacity weight speed and average gradient
Hiking Time Calculator
Use this hiking time calculator with clear inputs, formula notes, a worked example, common mistakes, and related calculators.
Hiking Calorie Calculator
Use this hiking calorie calculator with clear inputs, formula notes, a worked example, common mistakes, and related calculators.
Swim Split Per 100m Calculator
Calculate swim split time per 100 meters from total distance and total time. Useful for pool pacing and race planning.
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