Sports and Fitness

  • Karvonen Heart Rate Calculator
    Find your target heart rate zone with the Karvonen formula using heart rate reserve. Enter age, resting heart rate and intensity to get your THR in bpm.
  • Swim Pace Calculator (Per 100m)
    Calculate your swimming pace per 100m from any distance and time. Get your per-50m split and average speed in km/h instantly.
  • Epley 1RM Calculator
    Estimate your one-rep max (1RM) for bench press or any lift using the Epley and Brzycki formulas. Enter weight and reps to get instant results.
  • Running Pace Calculator
    Free pace calculator: find running pace, time, distance and speed from any two values. Supports miles, km, marathon and more, in US or metric units.
  • Earned Run Average (ERA) Calculator
    Calculate a pitcher's Earned Run Average (ERA) from earned runs and innings pitched. Supports 9-inning baseball, 7-inning softball and 6-inning Little League.
  • Rounds Per Minute Calculator
    Calculate rounds per minute (RPM) and rate of fire from rounds fired and elapsed time. Free, instant RPM calculator for any firearm or system.
  • Miles to Steps Calculator
    Convert miles to steps instantly. Enter distance and your stride length to estimate how many steps you walked or need to walk.
  • Wilks Calculator
    Calculate your Wilks score from bodyweight and total lifted (kg). Uses the original Wilks coefficient formula for fair powerlifting comparison.
  • Bench Press Pyramid Calculator
    Calculate your bench press pyramid set weights from your 1RM. Get 50/60/70/80/90/100% loads rounded to the plates you have.
  • 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.
  • 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.
  • NFL Passer Rating Calculator
    Calculate NFL quarterback passer rating from completions, attempts, yards, touchdowns and interceptions. Free QB rating tool with capped components.
  • 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.
  • Arrow FOC Calculator
    Calculate your arrow's Front of Center (FOC) percentage from arrow length and balance point to tune accuracy, penetration, and downrange flight.
  • 5/3/1 Training Max Calculator
    Calculate your 5/3/1 Training Max (90% of 1RM) and all weekly working-set weights (65/75/85%, 70/80/90%, 75/85/95%) instantly.
  • Baseball OPS Calculator
    Calculate a baseball batter's OPS, On-Base Percentage (OBP) and Slugging Percentage (SLG) from standard batting line stats. Free, instant, 3-decimal results.
  • 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 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.
  • 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.

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