Track and plan health metrics: BMI/BMR, calories, hydration and more—simple interfaces with clinically familiar formulas.
Audio Tools 1
Professional white noise generator with pink, brownian noise, binaural beats, 10-band EQ, and lowpass filter. Export to MP3, WAV, OGG. Free online sleep and focus sounds.
Calculators 31 Health & Fitness 31Calculate infant formula and breast milk intake by age and weight, with ml per kg per day and calorie intake (kcal/kg/day) for clinical adequacy checks.
Calculate feels-like temperature with wind chill, heat index, dew point, WBGT wet bulb globe temperature and OSHA/ACGIH heat-stress work-rest guidance.
Calculate running pace, time or distance for 5K, 10K, half, marathon. Negative-split pacing plan, splits table, Riegel predictor, min/km to mph converter.
Estimate your one rep max (1RM) with Epley, Brzycki and 5 more formulas, plus RPE correction and training weights for strength and hypertrophy.
Find your BMI and the target healthy weight range for your height, with WHO & Asian (2004) cutoffs and waist-to-height ratio for visceral fat risk.
Free BMR & TDEE calculator with Mifflin-St Jeor, Katch-McArdle and more. Get goal-based calorie targets and a protein floor in calories or kJ, metric/imperial.
Compare 7 body surface area formulas (Du Bois, Mosteller, Haycock, Gehan & George, Boyd) and convert a mg/m² dose to a total dose for chemotherapy and pediatric dosing.
WHO baby percentile calculator with real z-scores and SD screening. Get length, weight and head circumference percentiles for infants 0-36 months, corrected age ready.
Free body fat calculator using the U.S. Navy method. Get body fat percentage, fat mass, lean mass, ideal target by age and waist-to-height ratio risk.
Free body shape calculator for women. Find your shape (hourglass, pear, rectangle, inverted triangle, triangle), with waist-hip ratio and styling tips.
Guided breathing timer with box breathing (4-4-4-4), 4-7-8 relaxing, energizing 4-2-4 and calming 4-4-6 patterns. Reduces stress, helps sleep — runs in your browser.
Free calorie calculator: get your BMR, TDEE, daily macro split, and goal-based deficit or surplus for weight loss, gain, or maintenance.
Free child BMI percentile and BMI z-score calculator using the CDC LMS BMI-for-age method. Get BMI, percentile, SD score, weight category and healthy range for ages 2-20.
Child calorie calculator with Schofield BMR, TDEE and an IOM/DRI EER cross-check. Get recommended calories and macros for kids 1-18 in kg or lbs.
Plan cut, maintenance and bulk phases. Mifflin-St Jeor TDEE, protein-first macros, 3-6 meal splits and training-day carb cycling. Free, metric and imperial.
Free 20-20-20 rule timer for digital eye strain relief. Every 20 minutes, look 20 feet away for 20 seconds. Reduces dry eyes, headaches and Computer Vision Syndrome.
Free intermittent fasting timer for 16:8, 18:6, 20:4, OMAD and custom protocols. Live countdown, eating window calculator (when can I eat next), autophagy stages.
Find your healthy weight range from height, weight and BMI, plus an optional waist-to-height ratio (WHtR) for central-fat risk. Free, instant, no signup.
Ideal body weight calculator with Robinson, Miller, Devine and Hamwi formulas, BMI category and adjusted body weight (ABW) for medication dosing, metric and imperial.
Free Kegel exercise timer for men and women. Strengthen pelvic floor muscles with guided squeeze and release cycles, adjustable hold times, reps and sets.
Lean body mass calculator with Boer, James & Hume formulas plus FFMI classification. Estimate LBM for clinical drug dosing, BMR and protein targets.
Free IIFYM macro calculator: set protein by grams per kg or % of calories, then get carb and fat targets from your BMR and TDEE for cutting, bulking or keto.
Find your ovulation date and most fertile days, including irregular cycles, plus an estimated due date. Free fertility calendar with luteal phase tracking.
Free plank challenge timer with customizable hold and rest periods, set tracking, and guided beginner/intermediate/advanced presets. Build core strength in your browser.
Calculate your pregnancy due date from LMP, conception, or ultrasound. Free EDD calculator with trimester tracking and ACOG term-window dates.
Calculate the best time to wake up or go to sleep based on sleep cycles. Free sleep calculator to help you wake up refreshed during light sleep phases.
Calculate TDEE and BMR with the Mifflin-St Jeor formula, then get protein, carb, and fat macros for cutting, bulking, or maintenance calorie targets.
Free Tabata and HIIT interval timer. Classic 20/10 × 8, 30/30, 45/15 presets or custom work/rest, with audio cues and round tracking. Runs in your browser.
Karvonen heart rate zone calculator using HRR. Find Zone 2, fat-burn, cardio and threshold targets with Standard, Tanaka and Gulati max-HR formulas.
Free WHO growth chart calculator for children 0-19. Get length/height-for-age, weight-for-age and BMI-for-age percentiles, Z-scores and WHO classifications.
Calculate daily water intake by weight (kg/lb), activity and climate. Get liters, fl oz and cups, with pregnancy and breastfeeding adjustments.
Conversion 6
Volume Conversion 4Convert cups to pints instantly: 2 US cups = 1 US pint (16 fl oz). Free cup→pt calculator for recipes, brewing, bartending and bulk cooking conversions.
Convert pints to cups instantly: 1 US pint = 2 US cups (16 fl oz). Free pt→cup calculator for recipes, baking, brewing and bartending. Works for US measure.
Convert quarts to cups instantly: 1 US quart = 4 US cups (32 fl oz). Free qt→cup calculator for recipes, batch cooking, brewing and US kitchen volume.
Convert quarts to pints instantly: 1 US quart = 2 US pints (32 fl oz). Free qt→pt calculator for recipes, brewing, gardening and US kitchen volume measures.
Weight Conversion 2Convert grams to milligrams instantly: mg = g × 1000. Free g to mg calculator for medication dosing, nutrition labels, lab work and cooking with decimal precision.
Convert milligrams to grams instantly: g = mg / 1000. Free mg to g calculator for medication dosing, nutrition labels, lab work and recipes with decimal precision.
Fun Tools 1Free pet age calculator. Convert dog age, cat age, rabbit age, horse age to human years. Science-based (Wang 2019 epigenetic clock, AAHA, AAFP).
Hardware Tools 1
Sensors 1Free online pedometer using your accelerometer. Counts steps, distance from stride length, calories, cadence in steps per minute, with adjustable sensitivity.
Time Tools 1Find the best bedtime (or wake time) using 90-minute REM/NREM cycles. Adds sleep-onset latency. Shows 6, 5, 4, 3-cycle options + sleep stages breakdown.
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