Fitness Calculators
Calculate BMI, body fat, calories, macros, one-rep max, running pace, heart rate zones and dozens more fitness metrics instantly with our free online fitness calculators.
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â Popular Fitness Calculators
8+ CalculatorsBMI Calculator
Calculate your Body Mass Index from height and weight.
Calorie Calculator
Estimate your daily calorie needs to maintain, lose or gain weight.
Body Fat Percentage Calculator
Estimate body fat percentage from body measurements.
One Rep Max Calculator
Estimate your one-rep max from a submaximal lift.
TDEE Calculator
Calculate your Total Daily Energy Expenditure.
Macro Calculator
Calculate your ideal protein, carb and fat intake.
Running Pace Calculator
Calculate your running pace, time or distance.
Heart Rate Zone Calculator
Calculate your target heart rate training zones.
ð Body Composition & Measurements
10+ CalculatorsBMI Calculator
Calculate your Body Mass Index from height and weight.
Body Fat Percentage Calculator
Estimate body fat percentage from body measurements.
Lean Body Mass Calculator
Calculate your lean body mass excluding fat.
Waist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio for health screening.
Ideal Weight Calculator
Estimate a healthy target weight for your height and frame.
BMR Calculator
Calculate your Basal Metabolic Rate at rest.
Body Frame Size Calculator
Determine your body frame size from wrist measurement.
Skinfold Measurement Calculator
Estimate body fat percentage using skinfold caliper measurements.
Waist-to-Height Ratio Calculator
Calculate your waist-to-height ratio for health risk screening.
Army Body Fat Calculator
Calculate body fat percentage using the military tape test method.
ð―ïļ Calories & Nutrition
9+ CalculatorsCalorie Calculator
Estimate your daily calorie needs to maintain, lose or gain weight.
TDEE Calculator
Calculate your Total Daily Energy Expenditure.
Macro Calculator
Calculate your ideal protein, carb and fat intake.
Calorie Deficit Calculator
Calculate the calorie deficit needed to lose weight safely.
Protein Intake Calculator
Calculate your ideal daily protein intake for your goals.
Water Intake Calculator
Calculate your recommended daily water intake.
Meal Prep Calorie Calculator
Calculate calories per meal across your weekly meal prep.
Carb Cycling Calculator
Plan high, medium and low carb days around your training.
Weight Gain Calculator
Calculate a calorie surplus needed for healthy weight gain.
ðïļ Strength & Weightlifting
9+ CalculatorsOne Rep Max Calculator
Estimate your one-rep max from a submaximal lift.
Weightlifting Progression Calculator
Plan progressive weight increases across training weeks.
Wilks Score Calculator
Calculate your Wilks score to compare strength across bodyweights.
Plate Calculator
Calculate which plates to load on a barbell for a target weight.
Strength Standards Calculator
Compare your lifts against strength standards for your level.
Volume Load Calculator
Calculate total training volume from sets, reps and weight.
Rest Time Calculator
Calculate optimal rest time between sets for your training goal.
Powerlifting Total Calculator
Calculate your powerlifting total from squat, bench and deadlift.
Bench Press Calculator
Estimate your bench press max and recommended training weights.
ð Cardio & Running
9+ CalculatorsRunning Pace Calculator
Calculate your running pace, time or distance.
Marathon Time Predictor
Predict your marathon finish time from a recent race result.
VO2 Max Calculator
Estimate your VO2 max from running performance.
Heart Rate Zone Calculator
Calculate your target heart rate training zones.
Race Time Predictor
Predict your finish time for a different race distance.
Treadmill Pace Calculator
Convert treadmill speed settings into running pace.
Running Calorie Burn Calculator
Estimate calories burned during a run.
Cycling Speed Calculator
Calculate average cycling speed from distance and time.
Swim Pace Calculator
Calculate your swimming pace per 100 meters or yards.
ðïļ Workout Planning & Recovery
9+ CalculatorsWorkout Split Calculator
Plan a weekly workout split based on your training days.
Recovery Time Calculator
Estimate recommended recovery time between training sessions.
Training Volume Calculator
Calculate weekly training volume across all your workouts.
Rep Range Calculator
Determine the ideal rep range for strength, size or endurance goals.
Progressive Overload Calculator
Plan gradual increases in weight or reps over time.
Rest Day Calculator
Calculate how many rest days you need based on training intensity.
Workout Calorie Burn Calculator
Estimate calories burned during a workout session.
Stretching Routine Calculator
Plan a stretching routine duration based on muscle groups.
Sleep Need Calculator
Estimate recommended sleep hours based on training load.
ð Sports & Performance
10+ CalculatorsVertical Jump Calculator
Calculate vertical jump height and estimated power output.
Agility Score Calculator
Calculate an agility score from shuttle run test times.
Sports Hydration Calculator
Calculate fluid needs for training or competition.
Target Heart Rate Calculator
Calculate your target heart rate for exercise intensity.
Fitness Age Calculator
Estimate your fitness age based on performance metrics.
Sprint Speed Calculator
Calculate sprint speed from distance and time.
Athletic Performance Score Calculator
Calculate a composite athletic performance score.
Sports Injury Recovery Calculator
Estimate expected recovery time for a common sports injury.
Flexibility Score Calculator
Calculate a flexibility score from a sit-and-reach test.
Endurance Score Calculator
Calculate an endurance score from a timed run or test.
Why Use Our Fitness Calculators?
Whether you're a beginner, a competitive athlete, a coach or just trying to eat and train smarter, our fitness calculators provide fast, accurate and reliable results in seconds.
Instant Results
Get accurate fitness and nutrition numbers without manual math.
High Accuracy
Reliable formulas trusted by athletes, coaches and trainers.
Mobile Friendly
Use every calculator smoothly on desktop, tablet and mobile.
Completely Free
Unlimited calculations with no registration required.
How to Use a Fitness Calculator
Follow these simple steps for quick and accurate results.
Choose Calculator
Select the fitness calculator you need from the category list.
Enter Your Stats
Type in your height, weight, age or performance numbers.
Set Your Goal
Choose your training or nutrition goal where applicable.
Get Result
Instantly view your personalized fitness result.
Common Uses of Fitness Calculators
ðïļ Strength Training
Plan one-rep max, training volume and progressive overload.
ð Running & Cardio
Predict race times, pace and heart rate training zones.
ðĨ Nutrition
Calculate calories, macros and protein needs for your goals.
ð Body Composition
Track BMI, body fat percentage and lean body mass over time.
ð Sports Performance
Measure vertical jump, sprint speed and athletic performance.
ðī Recovery
Plan rest days, sleep needs and recovery time between sessions.
Frequently Asked Questions
Answers to the most common questions about fitness calculators.
What is a fitness calculator?
A fitness calculator estimates a health, nutrition or performance metric such as BMI, calories or one-rep max using standardized formulas based on your personal stats.
Are these fitness calculators accurate?
Yes. Our calculators use widely accepted fitness and nutrition formulas to provide reliable estimates. Individual results can vary based on genetics, body composition and activity level.
Can I use these calculators on mobile devices?
Absolutely. Every calculator is fully responsive and works smoothly on smartphones, tablets and desktop computers.
Are these fitness tools free?
Yes. All fitness calculators on Calculations.one are completely free to use without registration.
Which fitness calculator categories are available?
We offer calculators for body composition, calories and nutrition, strength and weightlifting, cardio and running, workout planning and recovery, and sports performance.
How often are new fitness calculators added?
We regularly expand our collection by adding new fitness calculators and improving existing tools.
Reach Your Fitness Goals Faster
Explore our growing collection of professional fitness calculators designed for athletes, coaches, trainers and everyday gym-goers.