Sport & Fitness
Running Pace Calculator
Convert between pace (min/km or min/mi), speed (km/h), and finish time for any distance.
Sport & Fitness
Evidence-based training calculators for runners, cyclists, and swimmers.
Sport & Fitness
VMA / VO₂max Estimator
Estimate your VMA and VO₂max from a Cooper 12-min test, a time trial, or a recent race result.
Sport & Fitness
Race Time Estimator
Predict your 5K, 10K, half-marathon, and marathon finish times from any known race performance.
Sport & Fitness
Training Pace Zones
Generate your complete running training pace table from VMA or threshold pace.
Sport & Fitness
Elevation Effort Calculator
Adjust your running effort and time for elevation gain using Naismith's rule and equivalent flat distance.
Sport & Fitness
Heart Rate Zone Calculator
Calculate your 5 heart rate training zones from your max HR or age. Includes Karvonen formula with resting HR.
Sport & Fitness
Cycling FTP & w/kg Calculator
Calculate your Functional Threshold Power (FTP) from a 20-min or 60-min test and get your full Coggan training zones.
Sport & Fitness
Calorie Burn Estimator
Estimate calories burned during any physical activity using MET values. Enter activity, duration, and body weight.
Sport & Fitness
Swimming Pace Calculator
Convert between swimming pace per 100m/yd, total distance, and finish time. Calculates CSS pace.
Sport & Fitness
Run Split Planner
Enter a target finish time and distance to get per-kilometer or per-mile split times.
Sport & Fitness
VO₂max from Race Time
Estimate your VO₂max from a recent race performance using the Daniels/VDOT formula.
Sport & Fitness
1RM Calculator
Estimate your one-rep max using the Epley, Brzycki, and Lombardi formulas from any rep count.
Sport & Fitness
Steps → Distance & Calories
Convert daily step count to distance (km/mi) and calories burned based on your height, weight, and pace.
Sport & Fitness
Training Load (CTL/ATL/TSB)
Enter daily TSS values and calculate your Chronic Training Load (fitness), Acute Training Load (fatigue), and Form (TSB).
Sport & Fitness
Pace Band Generator
Enter your target finish time for a marathon, half marathon, or 10K and get a printable pace band with splits every 5 km.
Sport & Fitness
Stretching Timer
Guided stretching routine with configurable hold time and rest time. Audio cue when each stretch is done.
Sport & Fitness
Walk / Run Interval Timer
Configurable walk/run interval timer. Set run and walk durations, number of rounds, and get audio cues for each switch.
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