Health & Fitness
BMI, calorie, heart rate and workout calculators
15 tools available
Body Metrics
4 toolsBMI Calculator
PopularCalculate your Body Mass Index and healthy weight range
Ideal Weight Calculator
Find your ideal body weight and healthy weight range
Body Fat Calculator
Estimate body fat percentage with the US Navy method
Body Surface Area Calculator
Calculate body surface area with multiple medical formulas
Fitness
5 toolsBMR Calculator
PopularEstimate basal metabolic rate and daily calorie needs
Heart Rate Zones Calculator
Find your target heart rate zones for training
Calories Burned Calculator
Estimate calories burned across dozens of activities
One Rep Max Calculator
Estimate your one-rep max from any set
Pace Calculator
Calculate running pace and speed from distance and time
Nutrition
4 toolsDaily Calorie Needs Calculator
PopularFind maintenance calories and targets for weight goals
Macro Calculator
Calculate daily calorie and macronutrient targets
Protein Intake Calculator
Find your daily protein target based on activity and goals
Water Intake Calculator
Calculate how much water you should drink daily
Pregnancy
2 toolsAbout Health & Fitness
From BMI and body fat to calories, macros, hydration and heart-rate zones, these calculators help you understand and plan your health and fitness goals with instant, actionable results.
Everything runs locally in your browser and is free to use. Treat results as a general guide alongside advice from a qualified professional.
Frequently Asked Questions
How accurate are BMI and body-fat estimates?▾
They apply validated formulas (WHO BMI ranges, US Navy circumference method) to your inputs - useful screening guides rather than clinical measurements. Athletic builds can skew BMI, for example.
Do you keep my health data?▾
Never. Calculations run in your browser and inputs vanish when you leave the page - no accounts, no tracking of personal metrics.
Which formula does the calorie calculator use?▾
Mifflin-St Jeor for basal metabolic rate, multiplied by activity factors for TDEE targets - the approach most dietitians consider a reliable starting estimate.
Can I use these during pregnancy?▾
The due-date calculator follows Naegele's rule for estimation. For nutrition targets during pregnancy, use results as conversation starters with your doctor rather than prescriptions.