fitness Calculators
BMI Calculator
Calculate your Body Mass Index (BMI) instantly by entering your weight and height. Use it to screen for underweight, healthy weight, overweight, or obesity categories as defined by the WHO.
Body Fat Percentage Calculator
Estimate your body fat percentage from a tape measure using the US Navy circumference method — the same protocol the US military uses for fitness compliance. Enter your waist, neck, height (and hip if female) and the calculator returns body fat percentage, accurate to within ±3–4 percentage points compared to a DEXA scan.
Calories Burned Running Calculator
Find out how many calories you burn while running based on your weight, running speed, and duration. Great for planning workouts and managing energy balance on training days.
One Rep Max Calculator
Predict your one-rep max (1RM) — the heaviest weight you could lift for a single perfect rep — from a recent set you actually performed. Used by powerlifters, strength coaches, and bodybuilders to prescribe percentage-based training (e.g., "work up to 5×5 at 80% of 1RM") without the risk and recovery cost of repeatedly testing true maxes.
Heart Rate Training Zones Calculator
Calculate your personalised heart rate training zones using the Karvonen heart rate reserve method, which factors in resting heart rate to give zones that actually reflect your cardiovascular fitness. Used by coaches and endurance athletes to keep aerobic, threshold, and VO2-max sessions in the right intensity bands.
Daily Calorie Needs Calculator
Find out how many calories your body needs each day to maintain, lose, or gain weight. Uses the Mifflin-St Jeor equation adjusted for your activity level.
Protein Intake Calculator
Estimate how many grams of protein you need daily based on your weight, activity level, and fitness goal — whether that's muscle gain, fat loss, or general health.
VO2 Max Estimator
Estimate your VO2 max — a key measure of aerobic fitness — from your running distance, time, and body weight. Useful for athletes and fitness enthusiasts tracking cardiovascular capacity.
Body Water Percentage Calculator
Estimate the percentage of your total body weight that is water, based on your age, gender, and weight. Useful for tracking hydration status and overall health.
Running Pace Calculator
Calculates your running pace in minutes per kilometre from your total time and distance. Perfect for race planning, training load management, and comparing performance across different runs.
TDEE Calculator
Estimates the total calories your body burns each day by combining your Basal Metabolic Rate with your activity level. Use it to set a precise calorie target for weight loss, maintenance, or muscle gain.
Body Fat Percentage Calculator
Estimates your body fat percentage from simple tape measurements using the U.S. Navy circumference method. Ideal for tracking fat loss progress without calipers or expensive lab equipment.
One Rep Max Calculator
Estimate your one-repetition maximum (1RM) from any set using four validated formulas — Epley, Brzycki, Lander, and O'Conner — and instantly see predicted maxes across rep ranges. Use it to set training loads without risking a true max attempt.
Macro Calculator
Split your daily calorie target into grams of protein, carbohydrates, and fat tuned to your goal — fat loss, muscle gain, maintenance, or keto. The output is the macro target sports-nutrition coaches and bodybuilders use to plan meals and track adherence with apps like MyFitnessPal or Cronometer.
Calorie Deficit Calculator
Find the daily calorie target you need to hit to lose weight at a chosen pace — the operational number that turns "I want to lose 5 kg" into "eat 1,950 kcal a day starting Monday." Enter your TDEE (maintenance calories) and the rate at which you want to lose weight, and the calculator returns the daily intake target along with a projected timeline.
Training Volume Calculator
Estimate your optimal weekly training volume in kilograms based on your 1RM, experience level, and intensity zone. Use it when programming a strength or hypertrophy block to avoid under- or over-training.
Heart Rate Zone Calculator
Find your personalized heart rate training zones using the Karvonen formula, which accounts for your resting heart rate and age. Ideal for runners, cyclists, and athletes structuring aerobic or threshold workouts.
Barbell Plate Calculator
Quickly determine which weight plates to load on each side of the barbell to hit your exact target weight. Essential for gym sessions when you need to set up a bar fast and accurately.
TDEE & Calorie Calculator
Calculate your Total Daily Energy Expenditure (TDEE) using the Mifflin-St Jeor equation adjusted for your activity level. Use it to set precise calorie targets for fat loss, muscle gain, or maintenance.
Training Volume Calculator
Quantify your weekly training load by calculating total tonnage lifted, adjusted for intensity zone and muscle group. Useful for tracking progressive overload in strength programs.
Running Pace Calculator
Convert any running time and distance into a per-kilometre or per-mile pace, and project your finish time at that pace over standard race distances. The operational tool runners use to set treadmill speeds, design interval workouts, and avoid blowing up by going out too fast on race day.
BMR & Daily Calorie Calculator
Calculate your Basal Metabolic Rate and total daily calorie needs using the Mifflin-St Jeor equation. Useful for weight loss, maintenance, or muscle gain planning based on your activity level.
Macro Split Calculator
Determine your optimal daily protein, carbohydrate, and fat targets in grams and calories based on your body weight, fitness goal, and training intensity. Supports cutting, bulking, maintenance, and ketogenic splits.
Body Fat Calculator (Navy Method)
Estimate your body fat percentage using the US Navy tape-measure method with only a few simple circumference measurements. No calipers or lab equipment required — results are suitable for health and fitness tracking.
Weekly Training Volume Calculator
Estimate your weekly training volume load in kg by combining sets, reps, weight, intensity, and recovery. Use it to track progressive overload and avoid under- or over-training.
Wilks Score Calculator
Calculate your Wilks score to compare powerlifting strength fairly across different body weights and genders. Used in competitions to determine Best Lifter awards regardless of weight class.
BMR & TDEE Calculator
Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) using the Mifflin-St Jeor equation. Use it to set accurate calorie targets for fat loss, maintenance, or muscle gain.
BMI & Body Surface Area Calculator
Calculates your Body Mass Index and Body Surface Area using your height, weight, and age. Use it to quickly screen for weight category or to estimate BSA for clinical dosing applications.
VO2 Max Calculator
Estimate your VO2 max — the maximum rate at which your body can take up and use oxygen during exhaustive exercise — from a recent race time without needing a lab treadmill or metabolic cart. VO2 max is the single best whole-system measure of aerobic fitness and is strongly predictive of all-cause mortality.
TDEE & Daily Calorie Calculator
Calculate your Total Daily Energy Expenditure — the calories your body burns each day — using the Mifflin-St Jeor equation adjusted for your activity level. Essential for setting an accurate calorie target for fat loss, muscle gain, or maintenance.
Weight Loss Timeline Calculator
Estimates how many weeks it will take to reach your goal weight given your calorie deficit, adherence rate, and metabolic adaptation. Useful when setting realistic milestones before starting a diet.
Training Load Calculator
Quantifies your weekly training load score from session duration, perceived exertion, weekly volume, experience level, and recovery quality. Use it to avoid overtraining and plan recovery weeks.