Health Tools
🏥 Health
Calculators
Body, nutrition & lifestyle calculators built for India.
Science-backed formulas. No login. Instant results.
Health Snapshot
Body & Weight
4 tools
Nutrition
5 tools
Lifestyle
5 tools
🏥 All Health Tools
⚡ Live
BMI Calculator
BMI with Asian cutoffs, 4 ideal weight formulas, health score, body composition & weight timeline.
⚡ Live
Calorie + BMR Calculator
Daily calorie needs using Mifflin-St Jeor formula.
⚡ Live
Water Intake Calculator
Daily water intake based on weight, activity & India climate.
⚡ Live
Sleep Calculator
Optimal bedtimes using 90-min sleep cycles for refreshed mornings.
⚡ Live
Ideal Weight Calculator
Ideal weight using 4 formulas — Devine, Robinson, Miller & Hamwi.
⚡ Live
Body Fat % Calculator
US Navy formula & BMI method — fat mass, lean mass & ideal range.
⚡ Live
Macro Calculator
TDEE-based protein, carbs & fat targets — 5 diet styles, meal breakdown.
⚡ Live
IF Timer
Live intermittent fasting countdown — 16:8, 18:6, OMAD & streak tracker.
🔜 Soon
Waist-to-Hip Ratio
Calculate waist-to-hip ratio and health risk level.
🔜 Soon
Body Frame Size
Determine small, medium or large body frame size.
🔜 Soon
Lean Body Mass
Calculate lean body mass using Boer formula.
🔜 Soon
Obesity Risk Calculator
Assess obesity risk based on BMI, waist & activity.
🔜 Soon
Protein Intake Calculator
Daily protein needs based on goal and body weight.
🔜 Soon
Vitamin D Dosage Tool
Estimate vitamin D needs by location & skin type.
🔜 Soon
Fiber Intake Calculator
Recommended daily fiber intake for your age & gender.
🔜 Soon
Sugar Limit Calculator
WHO recommended daily sugar limits & your intake check.
🔜 Soon
Exercise Calorie Burn
Calories burned by activity type, duration & weight.
🔜 Soon
Stress Level Checker
PSS-based perceived stress score calculator.
🔜 Soon
Screen Time Eye Strain
20-20-20 rule timer & daily screen limit guide.
🔜 Soon
Pregnancy Due Date
Calculate due date and pregnancy week tracker.
🔜 Soon
Ovulation Calculator
Fertile window and ovulation date calculator.
🔜 Soon
Target Heart Rate Zones
Max heart rate & training zones for your age.
Free Health Calculators India — CalcNation
CalcNation offers free health calculators for India — BMI Calculator with Indian cutoffs, Body Fat Calculator, Calorie & BMR Calculator, Macro Calculator, Water Intake, Sleep Cycle and Intermittent Fasting Timer.
Science-Backed Formulas for Indian Users
All health tools use validated formulas — Mifflin-St Jeor for BMR, US Navy method for body fat, Devine/Robinson/Miller/Hamwi for ideal weight. Results are calibrated for Indian body types and climate conditions.