Sports and Fitness

  • Fish Weight Calculator
    Estimate a fish's weight from its length and girth, or from length alone using a species shape factor. Get results in pounds, ounces and kilograms.
  • NFL Passer Rating Calculator
    Calculate NFL quarterback passer rating from completions, attempts, yards, touchdowns and interceptions. Free QB rating tool with capped components.
  • Goalie Save Percentage Calculator
    Calculate a goalie's save percentage (SV%) from shots against and goals allowed. Free hockey & soccer goalie stat calculator with formula.
  • Elo Rating Calculator
    Calculate your new Elo rating after a chess or game match. Enter ratings, result, and K-factor to find expected score and rating change instantly.
  • Wilks Calculator
    Calculate your Wilks score from bodyweight and total lifted (kg). Uses the original Wilks coefficient formula for fair powerlifting comparison.
  • Scuba Weight Calculator
    Estimate how much weight you need for scuba diving based on body weight, water type (salt/fresh), and your exposure suit. Quick starting-point guide.
  • Triathlon Heart Rate Training Zones Calculator
    Calculate sport-specific run and bike heart rate training zones for triathlon from your lactate threshold heart rate (LTHR) using the Joe Friel method.
  • Cycling Power Zones Calculator
    Calculate your 7 cycling power training zones from FTP using the Coggan model. Get watt ranges for endurance, tempo, threshold, VO2 max and more.
  • Hull Speed Calculator
    Calculate the theoretical hull speed of a displacement boat from its waterline length (LWL) in feet. Get results in knots, mph, and km/h instantly.
  • Training Pace Calculator
    Turn a recent race time into easy, tempo, threshold and long-run training paces. Free running pace calculator showing seconds per km for each zone.
  • Running Split Calculator
    Calculate your per-split time and total finish time from your target running pace and distance. Plan even splits for races and training runs.
  • Steps to Miles Calculator
    Convert your step count to miles using your height. Estimate walking distance from steps with an accurate, height-based stride length formula.
  • Steps to Km Calculator
    Convert steps to kilometers instantly. Enter your step count and height to estimate distance walked in km, meters, and miles using stride length.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.

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