Health & fitness
Health and fitness calculators for general information.
Estimate measures such as BMI, calorie needs, and fitness metrics. These tools do not diagnose conditions or replace advice from a qualified clinician.
Use health and fitness estimators for general information. Results are not a diagnosis or substitute for professional care.
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Explore every live global health calculator.
Each page follows the same pattern: dedicated route, working interactive calculator, explanatory copy, FAQs, and related links.
BMI Calculator
Calculate your Body Mass Index (BMI) from height and weight. Get instant WHO health weight categories, ideal weight ranges & tips on 1CalcHub.
Calorie Calculator
Calculate daily calorie needs, maintenance TDEE & macro targets with the Mifflin-St Jeor formula. Plan weight loss or gain instantly on 1CalcHub.
TDEE Calculator
Estimate total daily energy expenditure from BMR and activity level to understand maintenance calories.
Macro Calculator
Turn a daily calorie target into protein, carbohydrate, and fat goals using common macro split styles.
Water Intake Calculator
Estimate a practical daily hydration target from body weight, activity time, and climate.
Sleep Calculator
Plan bedtimes or wake-up times around common 90-minute sleep cycles and your normal fall-asleep delay.
Pregnancy Due Date Calculator
Estimate due date, current pregnancy age, and days remaining from LMP or conception date.
Body Fat Calculator
Estimate body-fat percentage, fat mass, and lean mass using the Navy tape-measure formula.
Ideal Body Weight Calculator
Estimate ideal body weight from height and sex, and compare it with a BMI-based healthy range.
Ovulation Calculator
Estimate ovulation date, fertile window, and next expected period from the first day of your last period and your usual cycle length.
Menstrual Cycle Calculator
Track next expected period, estimated fertile window, cycle day, and current cycle phase from your last period date and usual cycle length.
Blood Pressure Calculator
Classify a single adult blood pressure reading into a general category such as normal, elevated, stage 1, stage 2, or crisis range.
Heart Rate Zones Calculator
Estimate maximum heart rate and common moderate, vigorous, and training-zone ranges from age.
One Rep Max Calculator
Estimate one-rep max from a completed set and rep count, then view common training loads as percentages of that estimated max.
Lean Body Mass Calculator
Estimate lean body mass, fat mass, and lean-mass share from height, weight, and sex using a standard formula-based method.
Child BMI Calculator
Review age- and sex-specific BMI-for-age guidance for children and teens using the CDC reference workflow.
BAC Calculator
Estimate blood alcohol concentration from standard drinks, body weight, sex, and time since drinking began.
Pediatric Dose Calculator
Estimate a weight-based pediatric dose in mg and mL using mg/kg guidance, maximum single dose, and liquid concentration.
VO2 Max Estimator
Estimate aerobic fitness from a 12-minute Cooper run distance or a resting-heart-rate method.
Creatinine Clearance Calculator
Estimate creatinine clearance with a Cockcroft-Gault style calculation using age, sex, weight, and serum creatinine.
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