Free health tools — BMI calculator, calorie tracker, water reminder, and wellness utilities for a healthier life.
Health calculators — BMI, BMR via Mifflin-St Jeor, TDEE with activity multipliers, body fat, heart-rate zones, ovulation windows, and calorie needs. All math runs locally; no health data ever leaves your browser.
Computes Body Mass Index from metric or imperial height and weight inputs, categorizing the result into underweight, normal, overweight, and obese, with a healthy weight range for your height. Health data never leaves your device — every calculation runs locally in your browser.
Calculate body fat percentage using the US Navy circumference method. Enter waist, neck, height, and hip measurements. Health data never leaves your device — every calculation runs locally in your browser.
Estimate body fat percentage from BMI with an age and gender adjustment. Enter BMI, age, and gender for a quick estimate. Health data never leaves your device — every calculation runs locally in your browser.
Calculate your daily calorie needs from BMR (Mifflin-St Jeor) times activity level. Shows basal burn plus maintenance calories for fitness planning. Health data never leaves your device — every calculation runs locally in your browser.
Compute healthy weight range with Devine and Robinson formulas from height. See a 170 cm target band instantly — free, local, informational only.
Estimate lean body mass from weight and height with Boer and James formulas averaged — the number training actually moves. Track muscle, not just scale weight — free, local, informational only.
Calculate your waist-to-hip ratio and assess health risk based on your measurements and gender. Health data never leaves your device — every calculation runs locally in your browser.
Calculates Basal Metabolic Rate using the Mifflin-St Jeor equation with age, sex, height, and weight. Nutritionists use it for diet planning. Health data never leaves your device — every calculation runs locally in your browser.
Compute children's BMI from height and weight with metric/imperial inputs and a healthy-range readout for growth tracking. See where a 10-year-old sits — free, local, informational only.
Compute body surface area with four formulas (Mosteller, Du Bois, Haycock, Gehan & George) for medication dosing and physiology. Get m² from height and weight — free, local, informational only.
Calculate your Total Daily Energy Expenditure (TDEE) from BMR and activity level. Find how many calories you burn per day.
Estimate calories burned making breast milk by baby age and feeding frequency, at ~0.67 kcal per mL. Fuel milk production without guessing — free, local, informational only.
Compute daily protein needs from weight, goal, and activity — lifters to dieters covered. Hit 120g without guessing portions — free, local, informational only.
Compute keto daily calories (TDEE minus 500) with protein at 1.8g/kg and fixed 20g net carbs, fat filling the rest. Hit ketosis without math errors — free, local, informational only.
Compute daily protein, carb, and fat macro targets from calories and your own percentage split. Turn any diet into gram numbers — free, local, informational only.
Split calories into protein, carb, and fat grams for any diet target. Turn 2000 kcal into exact macros — free, local, no signup.
Estimate workout burn across running, cycling, swimming, yoga, and lifting from weight and duration. Price a 45-minute run in calories — free, local, estimate only.
Log daily calories with one-tap common foods and a running total — simple intake tracking that works. See the day add up as you eat — free, local, no signup.
Convert step counts to calorie burn with weight-adjusted math. Learn what 12,000 steps really cost — free, local, estimate only.
Calculate heart rate training zones by age. Find your target heart rate ranges for different exercise intensity levels. Health data never leaves your device — every calculation runs locally in your browser.
Convert step counts to kilometers and miles plus calorie estimates from height-based stride. Log daily steps with distance context — free, local, no signup.
Compute running pace and speed from distance and time in km or miles. Check splits for a 5K tune-up — free, local, no signup.
Estimate cycling burn from weight, speed, and distance with speed-based MET bands. Price a 40 km weekend ride in calories — free, local, estimate only.
Estimate due date from last period with trimester milestones. Get the 40-week roadmap instantly — free, local, informational only.
Track your fertile window and estimated ovulation date based on your last menstrual period. Helps with family planning. Health data never leaves your device — every calculation runs locally in your browser.
Calculate infant formula amounts by age and weight with feeding schedules. Get daily ounces and bottle splits right — free, local, informational only.
Compare baby weight and height against WHO median references by age and sex, shown as % above or below the median — a reference comparison, not clinical percentiles. Monitor your childs growth compared to population medians. Health data never leaves your device — every calculation runs locally in your browser.
Build age-appropriate baby sleep schedules — naps, bedtimes, wake windows. End the 5am party phase with structure — free, local, informational only.
Estimate a child's adult height from parents' heights with the mid-parental method. Get a ±8 cm range in seconds — free, local, estimate only.
Estimate your blood alcohol concentration (BAC) based on drinks consumed, weight, gender, and time elapsed. For educational purposes only. Health data never leaves your device — every calculation runs locally in your browser.
Get recommended sleep hours based on your age. Follows CDC and National Sleep Foundation guidelines from newborn to senior. Health data never leaves your device — every calculation runs locally in your browser.
Compute daily water needs from weight, activity, and climate. Drink the right amount, not 8 glasses blindly — free, local, no signup.
Compute ideal sleep bedtimes counting back in 90-minute cycles — whole and half-cycle rows (2 to 5 cycles) minus a 15-minute buffer. Wake refreshed at cycle ends, not mid-dream — free, local, no signup.
Works offline after first load · Pro unlocks 500-file batches and 2GB files
Not always — BMI can't distinguish muscle from fat, so athletes can read as overweight. Pair it with body-fat estimate and waist-to-height ratio (keep under 0.5) for a fuller picture.
With the Mifflin-St Jeor equation from weight, height, age, and sex — currently the most validated formula for resting calorie burn. Multiply by an activity factor (1.2–1.9) for TDEE.
Zone 2 (60–70% of max) builds aerobic base and burns fat efficiently; Zone 4–5 (80–100%) builds speed. Max is roughly 220 minus age — the calculators derive all five zones from it.
No. Every health calculator runs its math locally in your browser — weight, age, and measurements never leave your device.