Free Online Health Calculators

Estimate your Total Daily Energy Expenditure based on your physical features, daily activities, and exercise levels.

Determine your Basal Metabolic Rate—the calories your body burns at complete rest—using four distinct scientific models.

Establish a healthy calorie deficit target with an interactive timeline that projects safe weight loss week-by-week.

Bodybuilding cutting prep with calorie limits, muscle preservation limits, and interactive timelines.

Plan your Ramadan nutrition with adjusted fasting TDEE, personalized meal targets, and hydration goals.

Find your personalized macronutrient split. Get exact gram targets for proteins, carbohydrates, and healthy fats.

Calculate your optimal daily protein intake for muscle gain, fat loss, or maintenance with GLP-1 support.

Calculate daily water needs adjusted for body parameters, training, climate, and creatine supplements.

Zero-carb macro calculator with food equivalents, ratio explorer, adaptation timeline, troubleshooting engine, and meat cost estimator.

Create a custom weekly carb cycling plan. Estimate high, low, and no-carb day macros in grams.

Build a week-by-week calorie roadmap to recover your metabolism after a cut, with fat gain risk scoring and a water retention explainer.

Estimate your body fat percentage using Navy, YMCA, and skinfold caliper calculation methods side-by-side.

Determine your ideal body weight range using classic clinical equations (Devine, Robinson, Hamwi).

Calculate your lean body mass (LBM) and FFMI score using Boer, James, Hume, and Katch-McArdle formulas.

Calculate your Fat-Free Mass Index (FFMI) — raw and height-adjusted. Get natural muscle potential estimate, body composition, and what-if simulator.

Calculate Body Mass Index (BMI) for adults and kids. Includes child percentiles, Trefethen formula, and body fat/FFMI adjustments.

Calculate your Waist-to-Hip Ratio with body shape classification, health risk assessment, and ideal proportion analysis.

Calculate your Waist-to-Height Ratio (WHtR) with standard and military compliance modes. Health risk category, body shape analysis, and what-if simulator.

Estimate your maximum lifting capacities (squat, bench press, deadlift) with 5 scientific models.

Plan your fight week water cut with sport-specific protocols. Day-by-day loading, sodium timing, gut cut, and post-weigh-in rehydration.

Calculate your estimated due date, current pregnancy week, and trimester using LMP, conception, IVF or ultrasound dating.

Calculate your ovulation date and fertile window. Confidence-based predictions with optional BBT, LH test, and cervical mucus tracking.

Calculate infant and child percentiles for weight, height, BMI, and head circumference. Map growth curves and simulate trajectories.

Check your blood pressure reading instantly. Get BP category, MAP, pulse pressure, 7-day averages, age comparison, and trend tracking.

Find your optimal bedtime or wake-up time using 90-minute sleep cycles and age-based sleep duration recommendations.

Plan your fasting schedule with personalized eating windows, sleep overlap analysis, and protein-per-meal targets. Supports all major protocols.

Calculate your biological age using lifestyle factors, BMI, and resting heart rate. Includes what-if simulator, system ages, and personalized action plan.

Find your Zone 2 heart rate using %MHR or Karvonen methods. Compare formulas, view all 5 zones, and classify any heart rate reading.

Find your grip strength percentile by age and gender. Includes longevity risk, EWGSOP2 sarcopenia screening, and improvement targets.

Estimate VO2 max without a wearable. 4 test methods: Cooper run, Rockport walk, George jog, or no-exercise estimate. Get cardio age, ACSM classification, and training zones.

Enter your rMSSD or SDNN from Oura, WHOOP, Garmin, or Apple Watch. Get your age-sex percentile, ANS balance, lifestyle impact score, and daily recovery recommendations.