Sports and Fitness

  • Race Time Improvement Calculator
    Calculate how much faster your new race time is versus your old time. See the percent improvement and seconds saved instantly.
  • Race Time Predictor Calculator
    Predict your race finish time at any distance using Riegel's formula. Enter a known time and distance to forecast 5K, 10K, half & full marathon times.
  • Magic Mile Calculator
    Use Jeff Galloway's Magic Mile time trial to predict your 5K, 10K, half marathon and marathon race pace and finish times.
  • MET Minutes Calculator
    Calculate MET-minutes from any activity's MET value and duration. Find per-session and weekly physical activity totals to track exercise intensity.
  • Marathon Pace Calculator
    Calculate your required marathon pace per mile and per kilometer from your goal finish time. Free, fast marathon pace calculator for runners.
  • Hiking Time Calculator
    Estimate how long a hike will take using Naismith's Rule: time from distance, walking speed, and total ascent. Free, instant trek planning tool.
  • Max Heart Rate Calculator
    Estimate your maximum heart rate (HRmax) from age using the Fox (220 − age) or Tanaka (208 − 0.7 × age) formula, plus training heart-rate zones.
  • Heart Rate Zone Calculator
    Calculate your 5 heart rate training zones from age or HRmax. Find target bpm ranges for fat burn, endurance, and peak performance.
  • Heart Rate Recovery Calculator
    Calculate your heart rate recovery (HRR) — the bpm drop one minute after peak exercise. Enter peak and recovery heart rate to gauge fitness.
  • Bruce Protocol METs Calculator
    Estimate METs and VO2 max from your Bruce treadmill protocol exercise time. Enter total minutes and gender to gauge cardiorespiratory fitness.
  • Human Punch Force Calculator
    Calculate human punch force in newtons, pounds-force and kgf using fist mass, impact velocity and contact time with the impulse-momentum formula.
  • Anaerobic Threshold Calculator
    Estimate your anaerobic threshold (AT) heart rate from age and intensity percentage. Uses AT_HR = % × (220 − age) for training zone targeting.
  • Baseball Hit-By-Pitch Rate (HBP per 9 Innings) Calculator
    Calculate a pitcher's hit-by-pitch rate per 9 innings (HBP/9). Enter innings pitched and batters hit; get the standard per-nine baseball stat instantly.
  • Half Marathon Pace Calculator
    Calculate your half marathon pace per km and per mile from your finish time. Get average pace, speed in km/h and mph for the 21.0975 km distance.
  • Bike Chain Length Calculator
    Calculate the correct bicycle chain length from chainstay length, largest chainring and largest cog using the rigid chain length equation. Results in inches and links.
  • Bike Speed Calculator
    Calculate your bike speed from cadence, gear ratio (chainring/cog) and wheel size. Get results in km/h, mph and m/s instantly.
  • Bike Cadence Calculator
    Calculate your cycling cadence (pedal RPM) from speed, wheel circumference, and gear ratio. Free, instant bike cadence calculator for any gearing.
  • Home Runs Allowed Per 9 Innings (HR/9) Calculator
    Calculate a pitcher's HR/9 — home runs allowed per nine innings. Enter innings pitched (with partial-inning outs) and home runs allowed to get the rate.
  • 5K Pace Calculator
    Calculate your 5K running pace per kilometer and per mile from your finish time. See pace, speed in km/h and mph instantly.
  • Handball Calories Burned Calculator
    Estimate calories burned playing handball from MET value, body weight, and duration. Uses the standard MET energy-expenditure formula (kcal = METs x kg x hours x 1.05).
  • Ski Size Calculator
    Find your ideal ski length based on your height and skill level. Get a recommended size plus a shorter-to-longer range in centimeters.
  • Winning Percentage Calculator
    Calculate winning percentage from wins, losses, and ties. Ties count as half a win in this standard sports win % formula.
  • Cycling Wattage Calculator
    Estimate the cycling power (watts) needed to ride at a given speed using rolling resistance, aerodynamic drag, gradient and drivetrain loss.
  • Save Percentage Calculator
    Calculate a goalie's save percentage (SV%) from saves and goals allowed. Free hockey and soccer goalkeeper save percentage calculator.

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