Fitness Calculator

These calculators support training, performance tracking, and weight management. The 1RM Calculator estimates your one-rep max for strength programming, the Running Pace Calculator and Pace Converter keep your run targets dialed in, and the Skinfold Body Fat Calculator gives a field-based body composition estimate. The Weight Loss Percentage Calculator tracks progress over time, and the Car-to-Bicycle Commute Savings and Calorie Calculator puts active commuting in numbers.

Browse the most-popular list to see which tools athletes and fitness enthusiasts reach for most, or open the Trending tab for what's rising right now. Every calculator is free, needs no account, and works on any device.

  • Target Heart Rate Zone Percentage Calculator
    Calculate your target heart rate at any exercise intensity percentage using your age and the 220-minus-age maximum heart rate formula.
  • Calories Burned Per Step Calculator
    Estimate calories burned walking by step count, body weight and stride length. See total kcal, calories per step and distance walked.
  • Calories Burned Running Calculator (by Speed)
    Estimate calories burned running by speed (mph), body weight and duration using MET values. Fast, free running calorie calculator for any pace.
  • Bulking & Cutting Calorie Calculator
    Calculate your daily calorie target for bulking, cutting, or maintaining based on your TDEE. Bulk at 110-120% and cut at 75-85% of maintenance.
  • Creatine Dosage Calculator
    Calculate your daily creatine monohydrate dose by body weight: loading phase (0.3 g/kg split in 4) and maintenance (0.03 g/kg, ~3-5 g/day).
  • Running Calories Calculator (Distance & Weight)
    Estimate calories burned running from your body weight and distance. Uses the simple 0.75 × lb × miles (or 1.036 × kg × km) rule for any pace.
  • Brzycki 1RM Calculator
    Estimate your one-rep max (1RM) with the Brzycki formula. Enter the weight lifted and reps performed to get your maximum strength estimate instantly.
  • Calories Burned by Steps Calculator
    Estimate calories burned from your step count, body weight and height. Free calculator using stride length and distance to give kcal burned walking.
  • Steps to Calories Calculator
    Convert daily steps into calories burned. Enter steps, body weight and stride length to estimate kcal and distance walked instantly.
  • Fat Mass to Lose for Goal Body Fat % Calculator
    Find how many kg of fat you need to lose to hit a target body fat percentage, assuming lean mass stays constant. Free, instant results.
  • Treadmill Pace & Incline Calculator
    Convert treadmill speed (mph) to running pace per mile and find the incline-equivalent flat pace using the ACSM VO2 running equation.
  • Cooper 12-Minute Run VO2 Max Calculator
    Estimate your VO2 max from the Cooper 12-minute run test. Enter distance in meters to calculate aerobic fitness instantly with the Cooper formula.
  • Weekly Calorie Deficit Calculator
    Calculate your daily and weekly calorie deficit and see your estimated weekly weight loss in kg and pounds. Free, instant weight-loss pace tool.
  • Running Calories Burned Calculator
    Estimate calories burned while running using the MET formula. Enter your weight, pace and duration to get kcal burned and calories per minute.
  • Pace to Speed Converter
    Convert running pace (min/mile) to speed (mph) and back instantly. Also shows km/h and min/km equivalents for easy treadmill and race planning.
  • One-Rep Max (1RM) Calculator
    Estimate your one-rep max (1RM) for deadlift, squat, or bench from reps and weight using the Epley and Brzycki formulas. Free, fast, and accurate.
  • Cooper 12-Minute Run Test Calculator
    Estimate your VO2 max from the Cooper 12-minute run test. Enter the distance covered in meters to get your aerobic fitness score instantly.
  • VO2 Max Estimate Calculator (Cooper Test)
    Estimate your VO2 max from the Cooper 12-minute run test. Enter meters covered in 12 minutes to get your aerobic fitness score in mL/kg/min.
  • Running Calories Burned Calculator
    Estimate net calories burned running from your body weight and distance. Free running calorie calculator using the simple 1.036 × kg × km formula.
  • Percentage of 1RM Calculator
    Calculate your training weight as a percentage of your one-rep max (1RM). Enter your 1RM and target percentage to get the load to lift.
  • Target Heart Rate Zone Calculator (Karvonen)
    Calculate your target heart rate training zone using the Karvonen formula based on age, resting heart rate, and exercise intensity percentage.
  • VO2 Max Calculator from Run Time
    Estimate your VO2 max from a 12-minute Cooper run distance or from your max/resting heart rate ratio. Free aerobic fitness calculator.
  • Miles Per Hour Pace Calculator
    Free pace calculator: enter distance and time to get your pace per mile and per kilometer plus speed in mph and km/h. Works for running, walking, cycling.
  • METs to VO2 Conversion Calculator
    Convert METs to VO2 oxygen consumption instantly. Enter activity intensity in METs to get VO2 in mL/kg/min, plus optional absolute VO2 in L/min.

Frequently asked questions

What fitness metrics can I calculate here?

You can estimate your maximum lifting strength with the 1RM Calculator, dial in running pace and pace unit conversions, measure body fat percentage from skinfold data, calculate weight loss as a percentage, find your personalized cardio training zones with the Karvonen Formula, and even quantify the calorie benefit of cycling your commute.

How reliable are these fitness estimates?

Each tool applies an established method — for example, Epley's or Brzycki's formula for 1RM, and Jackson-Pollock equations for skinfold body fat. All outputs are statistical estimates and should be treated as training guides, not clinical measurements. These tools are NOT a substitute for medical advice; consult a qualified healthcare professional for health-related fitness planning.

How do I use the 1RM Calculator safely?

Enter the weight you lifted and the number of reps completed (typically 2 to 10 reps for best accuracy), and the calculator estimates your theoretical one-rep max. Use the result to set training percentages — never attempt a true max single without a proper warm-up, a spotter, and solid experience with the movement.

Do you store my workout or health data?

No. Every calculation is processed locally in your browser. No body measurements, pace times, rep counts, or weight values are sent to our servers or saved between visits.

Which fitness calculators are used most?

The list is ordered by actual visitor traffic, so the top entries are genuinely the most popular. Open the Trending tab to see which tools are getting the biggest recent surge in usage.

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