Health Tools — 38 Free Online Tools
All health tools run 100% in your browser — free, private, no sign-up.
Track your health with 35+ free calculators. Fitness and diet: BMI, BMR, TDEE, calorie and calorie-deficit calculators, macro and keto planners, ideal weight, body fat, protein intake, water intake, one-rep max, running pace, heart rate zones, steps to calories and waist-to-height ratio. Pregnancy and family: due date, ovulation, period, safe period, conception date, IVF due date, pregnancy week and weight gain, child height predictor, baby growth percentile and vaccination schedule. Medical converters: blood sugar mg/dL to mmol/L, A1C to average glucose, cholesterol ratio and a blood pressure checker.
Each tool explains its formula and shows results instantly and privately in your browser. These calculators are for education and awareness only — they are not medical advice, and you should always consult a qualified doctor for health decisions.
BMI Calculator
Body Mass Index with health category.
BMR Calculator
Basal metabolic rate and daily calorie needs.
Calorie Calculator
Calculate BMR, TDEE, and daily calorie targets for weight loss, maintenance, or gain.
Water Intake Calculator
Get your personalised daily water goal in litres and glasses based on weight and activity.
Ideal Weight Calculator
See ideal weight from Devine, Robinson, Hamwi formulas and healthy BMI weight range.
Body Fat Calculator
Estimate body fat percentage using US Navy tape method with highlighted fitness category.
Protein Intake Calculator
Calculate daily protein needs and see food examples including Indian vegetarian sources.
Sleep Calculator
Find the best bedtime or wake‑up time using 90‑minute sleep cycles.
Dog Age Calculator
Convert dog years to human years by size (small, medium, large) — modern vet formula.
Pregnancy Due Date Calculator
Estimate your due date from LMP or conception date, adjust for cycle length, see current week and trimester.
Ovulation Calculator
Find your fertile window and ovulation day. Predicts next 3 cycles with dates.
Period Cycle Calculator
Predict next 6 period dates with ovulation estimate. Simple cycle tracker.
Pregnancy Week Calculator
Exact pregnancy week and day, trimester, fruit-size baby comparison, weeks remaining.
Safe Period Calculator
Rhythm method safe/unsafe day calendar with reliability warning.
Conception Date Calculator
Estimate conception date from due date, birth date, or LMP with date windows.
IVF Due Date Calculator
Calculate IVF due date from day-3, day-5 embryo transfer or egg retrieval.
Pregnancy Weight Gain Calculator
Check pregnancy weight gain against IOM guidelines by pre-pregnancy BMI and week.
Child Height Predictor
Estimate adult height using mid-parental formula and likely range.
Baby Growth Percentile
WHO weight and length percentiles for 0-24 months. Simplified lookup tables.
Baby Vaccination Schedule India
India NIS schedule with due dates calculated from your baby DOB. Printable.
Cat Age Calculator
Convert cat years to human years using the 15-9-4 rule. Shows life stage.
TDEE Calculator
BMR and TDEE from Mifflin-St Jeor. All 5 activity levels, cut and bulk calories.
Calorie Deficit Calculator
Daily calorie target for weight loss rate. Warns if below minimum safe intake.
Weight Loss Planner
Goal date and month-by-month weight projection from your daily deficit.
Macro Calculator
Split calories into protein, carbs and fat grams. Balanced, high-protein, low-carb presets.
Keto Macro Calculator
Keto macros with net carb cap, fat and protein grams. Tips included.
Intermittent Fasting Calculator
Eating and fasting windows for 16:8, 18:6, 20:4, OMAD with visual 24h bar.
One Rep Max Calculator
Estimate 1RM via Epley and Brzycki, average, and training percentage table.
Running Pace Calculator
Pace, speed and race time predictions via Riegel formula. 5K to marathon.
Heart Rate Zone Calculator
5 training zones using Karvonen formula. Personalised BPM ranges.
Waist to Height Ratio Calculator
Quick health risk screen from your waist and height. Validated indicator.
Steps to Calories Converter
Steps to distance and calories burned. Uses weight, height and pace.
Smoking Cost Calculator
Money, time regained and SIP future value of smoking cost. Copy summary.
Blood Pressure Checker
ACC/AHA blood pressure categories with color-coded result and chart.
Blood Sugar Converter
mg/dL to mmol/L live conversion with normal/prediabetes/diabetes ranges.
A1C to eAG Calculator
A1C percentage to estimated average glucose. Full table and categories.
Cholesterol Ratio Calculator
TC/HDL, LDL/HDL, non-HDL and Friedewald LDL estimate with ideal cutoffs.
Kids BMI Calculator
BMI for children 2-18 using CDC percentile cutoffs. Adult categories do not apply.
Frequently Asked Questions
Which formula do the BMR and TDEE calculators use?
They use the Mifflin-St Jeor equation, which is the most widely recommended for adults, multiplied by standard activity factors for TDEE.
How accurate is the pregnancy due date calculator?
It uses the standard 280-day (Naegele) rule with cycle-length adjustment, the same method used in clinics. Only an ultrasound can give a more precise date.
Can I rely on these tools for medical decisions?
No. They are educational tools. Always confirm with a qualified doctor before making any medical decision.