Health
Free online health calculators including BMI calculator, basal metabolic rate, and body fat percentage calculator.
Use health calculators as reference checks, not diagnosis
The health category covers common reference calculations such as BMI, body fat, hydration, caffeine, exercise calories, and similar everyday wellness numbers. They are useful for quick checks and personal tracking, but they do not replace medical diagnosis or treatment advice.
Health numbers depend on age, sex, activity, existing conditions, and measurement quality. Use the result to understand a range, compare changes over time, and decide whether you need a more reliable source or professional guidance.
27 tools
Common uses
- Check weight, body composition, hydration, or activity estimates.
- Compare exercise and lifestyle scenarios.
- Record the same value over time to see a trend.
- Prepare clearer notes before a professional consultation.
Quick checks
Is a health calculator a diagnosis?
No. It is a reference calculation based on your inputs. Medical symptoms and treatment decisions require a qualified professional.
What if my result is outside the suggested range?
Check your inputs first and avoid judging from one result. If the pattern continues or you have symptoms, seek professional advice.
Are exercise calorie estimates exact?
No. Intensity, body size, and measurement differences can change the number. Treat it as a comparison estimate.
Tools
27 tools1RM Calculator
Compare 1RM formulas from your lifted weight and reps, then review target loads, rep tables,...
4-7-8 Breathing Guide
Practice the 4-7-8 breathing technique: 4 seconds inhale, 7 seconds hold, 8 seconds exhale. Effective...
Apnea-Hypopnea Index (AHI) Calculator
Enter apnea count, hypopnea count, and total sleep time to calculate adult AHI severity ranges...
Baby Kaup Index Calculator
Enter age in months, height, and weight to estimate a baby Kaup index, age reference...
BMI Calculator
Calculate your BMI, see your WHO weight category, and check the healthy weight range for...
Body Fat Calculator
Estimate body fat percentage with the U.S. Navy Method using inches or centimeters, pounds or...
Caffeine Half-Life Calculator
Estimate how much caffeine may remain at bedtime and find a target-based caffeine cutoff using...
Calorie Calculator
Calculate BMR and TDEE for weight management. Supports Mifflin-St Jeor and Harris-Benedict formulas.
Child Height Predictor
Estimate a child’s adult height range from sex, age, current height, and both parents’ heights...
Dew Point Calculator
Calculate dew point from air temperature and relative humidity, then review muggy-air comfort, saturation gap,...
Feels Like Temperature Calculator
Enter air temperature, humidity, and wind speed to estimate shaded feels-like temperature plus heat index...
Golf Calorie Calculator
Estimate golf calories burned from your weight, play time, and activity type. Compare practice, cart...
HAS-BLED Calculator
Review HAS-BLED bleeding risk factors in atrial fibrillation and see the total score (0-9), the...
Heat Index Calculator
Enter air temperature and relative humidity to estimate shaded heat index, NWS risk bands, temperature...
Height Calculator
Convert height between feet/inches and centimeters, see meters and total inches, and review BMI-based reference...
Ideal Weight Calculator
Calculate your ideal body weight based on height, gender, and frame size. Compare results from...
Marathon Pace Calculator
Plan marathon pacing from a target time or current pace, then review splits, VDOT training...
Running Calorie Calculator
Enter weight in pounds, distance in miles, and average pace per mile to estimate running...
Running Distance Calculator
Enter average pace and running time to estimate distance in miles, kilometers, and meters, with...
Running Pace Calculator
Enter running distance and total time to calculate average pace in min/mile and min/km, with...
Running Stride Calculator
Enter running distance and total steps to calculate average stride length, steps per mile, 10,000-step...
Running Time Calculator
Enter distance and average pace to estimate finish time, speed, 400 m lap, and 5K,...
Swimming Calories Calculator
Estimate swimming calories burned from weight in pounds, stroke or effort level, and swim time,...
Swimming Pace Calculator
Enter swim distance and total time to calculate pace per 100 m, 50 m and...
VO2 Max Calculator
Estimate VO2 max from a Cooper 12-minute run or Rockport 1-mile walk. Built for U.S....
Water Intake Calculator
Calculate your daily recommended water intake based on weight, activity level, exercise duration, and climate....
Wind Chill Calculator
Estimate wind chill, air-temperature drop, frostbite risk bands, and exposed-skin caution time from temperature and...