About These Calculators
Science-based fitness calculators to help you reach your health goals. Calculate your TDEE, figure out macro splits, estimate body fat percentage, plan running paces, and more — all using peer-reviewed formulas.
Fitness & Health Calculators
49 toolsBody Fat Calculator (Navy Method)
Estimate your body fat percentage using the U.S. Navy method
TDEE Calculator
Calculate your Total Daily Energy Expenditure and BMR
Macro Calculator
Calculate your daily protein, fat, and carb targets
Calorie Deficit Calculator
Find out exactly how many calories to eat to reach your goal weight
One Rep Max Calculator
Estimate your one-rep max using multiple proven formulas
Plate Loading Calculator
Find the exact plate combination for any barbell weight
Wilks Score Calculator
Calculate your Wilks score for powerlifting competitions
Running Pace Calculator
Calculate pace, time, or distance for any run
Race Time Predictor
Predict your race time at any distance using the Riegel formula
Protein Intake Calculator
Find your optimal daily protein intake based on your goals
Water Intake Calculator
Calculate your optimal daily water intake based on your body and activity level
Pregnancy Due Date Calculator
Calculate your estimated due date from your last menstrual period or conception date
Sleep Cycle Calculator
Wake up refreshed by timing your sleep cycles perfectly
BAC Calculator
Estimate your blood alcohol content using the Widmark formula
BMR Calculator
Calculate your basal metabolic rate using the Mifflin-St Jeor equation
Lean Body Mass Calculator
Calculate your lean body mass from weight and body fat percentage
Heart Rate Zone Calculator
Find your 5 heart rate training zones for optimal fitness
Intermittent Fasting Calculator
Plan your fasting and eating windows for any IF protocol
BMI Calculator
BMI Calculator — calculate your Body Mass Index and health category
Ideal Weight Calculator
Find your ideal weight range based on height and frame size
Calorie Calculator
Calculate how many calories you need per day based on your goals
Calories Burned Calculator
Estimate calories burned during various activities
Walking Calorie Calculator
Calculate calories burned walking based on speed, weight, and time
Steps to Calories Calculator
Convert your daily step count to calories burned
Bench Press Max Calculator
Estimate your bench press one-rep max from any rep range
Squat Max Calculator
Estimate your squat one-rep max
Deadlift Max Calculator
Estimate your deadlift one-rep max
Marathon Pace Calculator
Calculate your marathon pace and predicted finish time
Half Marathon Pace Calculator
Calculate your half marathon pace and splits
5K Pace Calculator
Calculate your 5K pace and predicted finish time
Cycling Power Calculator
Calculate cycling power-to-weight ratio and FTP zones
Push-Up Test Calculator
Rate your fitness level based on push-up count
Body Recomposition Calculator
Calculate calories and macros for simultaneous fat loss and muscle gain
Creatine Dosage Calculator
Calculate your optimal creatine monohydrate dosage
Bulking Calorie Calculator
Calculate calories and macros for a lean bulk
Cutting Calorie Calculator
Calculate calories and macros for a cutting phase
Gym Membership Cost Calculator
Compare gym membership costs and find the best value
Muscle Recovery Time Calculator
Estimate optimal recovery time between workouts by muscle group and intensity
Vertical Jump Calculator
Measure your vertical leap and see how it ranks by age and sport
Grip Strength Calculator
See how your grip strength compares to percentile norms by age and gender
Flexibility Score Calculator
Assess your flexibility with the sit-and-reach test and see your percentile ranking
Sprint Speed Calculator
Convert sprint times to speed and compare against athletic benchmarks
Endurance VO2 Max Predictor
Estimate your VO2 max from race times and predict endurance performance
Body Fat Percentage Calculator
Estimate your body fat percentage from measurements
Running Pace & Split Calculator
Calculate your running pace, speed, and finish time
BMI Body Mass Index Calculator
Calculate your Body Mass Index and health category
Calorie Deficit Weight Loss Calculator
Calculate your calorie deficit for weight loss goals
One Rep Max Strength Calculator
Estimate your 1RM from submaximal lifts
Gym Membership Value Calculator
Calculate your real cost per workout based on how often you actually go
Frequently Asked Questions
Are these fitness & health calculators free?
Yes, all 49 calculators are completely free with no signup required. They run entirely in your browser — no data is sent to any server.
How accurate are these calculators?
Our calculators use industry-standard formulas and are regularly updated. However, they provide estimates — always verify critical calculations with a professional in the relevant field.
Can I use these calculators on my phone?
Yes, all calculators are mobile-responsive and work on any device with a web browser. No app download needed.
Do you save my calculations?
No. All calculations happen in your browser. We don't store any of your inputs or results. Your data stays on your device.
Can I embed these calculators on my website?
Select calculators offer embed codes that you can copy and paste into your website or blog. Look for the "Embed This Calculator" section on individual tool pages.