Health Tools

Free BMI calculator for 2026. Enter your height and weight in metric or imperial units to see your Body Mass Index, healthy weight range and category — instantly, in your browser.

Free BMR calculator using the Mifflin–St Jeor equation. Enter your height, weight, age and sex to find how many calories your body burns at rest. Updated 2026.

Free TDEE calculator. Find how many calories you burn per day at your activity level using Mifflin–St Jeor BMR plus an activity multiplier. Updated 2026.

Free calorie calculator for 2026. Find daily calorie targets for weight loss, maintenance and gain at sustainable rates. Uses Mifflin–St Jeor + activity multiplier.

Free macro calculator. Enter your stats and pick a split (Balanced, Low fat, Low carb, High protein, Keto) to get your daily protein, carbs and fat in grams. Updated 2026.

Free body fat percentage calculator using the US Navy circumference method. Tape measurements + height + sex give you body fat % within 3 % accuracy. Updated 2026.

Free Army body fat calculator using the AR 600-9 circumference method. Enter your tape measurements and see whether you fall within Army standards for your age and sex. Updated 2026.

Free lean body mass calculator using the Boer formula. Estimate the mass of muscle, bone, organs and water in your body — everything that isn't fat. Updated 2026.

Free ideal weight calculator. Compare four published formulas (Devine, Robinson, Miller, Hamwi) for your healthy weight target by height and sex. Updated 2026.

Free BSA calculator. Compute total body surface area in m² using both the DuBois (1916) and Mosteller (1987) formulas. Updated 2026.

Free pregnancy due date calculator using Naegele's rule. Enter your last menstrual period (LMP) to estimate your baby's due date and trimester milestones. Updated 2026.

Free pregnancy calculator. Get your gestational age, due date, trimester boundaries and pregnancy milestones from LMP, conception, or ultrasound. Updated 2026.

Free pregnancy weight gain calculator based on IOM/NAM guidelines. Get a recommended total gain and weekly target tailored to your pre-pregnancy BMI. Updated 2026.

Free pregnancy conception calculator. Estimate the date of conception from your due date, last menstrual period (LMP), or current gestational age. Updated 2026.

Free ovulation calculator. Predict your ovulation day and most-fertile window from your last period and cycle length. Updated 2026.

Free conception calculator. Find your best days to conceive over the next 3 cycles based on your typical cycle and last period. Updated 2026.

Free period calculator. Predict the dates of your next 6 periods and see ovulation/fertile days for each cycle. Updated 2026.

Free running pace calculator. Solve for pace, time, or distance — supports km and miles, plus race-distance splits (5K, 10K, half, marathon). Updated 2026.

Free 1RM calculator using Epley, Brzycki, and Lombardi formulas. Estimate your one-rep max from a submaximal lift and see training percentages. Updated 2026.

Free target heart rate calculator. Get your max heart rate (Tanaka formula) and the 5 training zones for fat burn, endurance, tempo, threshold, and VO₂ max. Updated 2026.

Free calories-burned calculator using the MET method. Estimate kcal burned for running, walking, cycling, swimming, weights, HIIT and more. Updated 2026.

Free daily protein calculator. Get a recommended grams-per-day target based on your weight and goal — sedentary, training, hypertrophy, or cutting. Updated 2026.

Free daily carbohydrate intake calculator. Get a g/day target based on your TDEE, training volume and goal — endurance, strength, low-carb or keto. Updated 2026.

Free dietary fat intake calculator. Get a daily g/day target from your TDEE — balanced, low-fat, low-carb, or keto. Updated 2026.

Free healthy weight calculator. Find the weight range that puts you in the BMI 18.5–24.9 'healthy' band for your height. Updated 2026.

Free overweight calculator. Find out how many kg or lb above the healthy BMI band you are, and see realistic timelines to reach BMI 24.9. Updated 2026.

Free GFR calculator using CKD-EPI 2021 (race-free) — the current ASN/NKF standard for kidney function. Returns eGFR in mL/min/1.73 m² with CKD stage. Updated 2026.

Free body type calculator. Estimate your somatotype (ectomorph, mesomorph, endomorph) and your body shape (apple, pear, hourglass, rectangle, inverted triangle). Updated 2026.

Free educational BAC calculator using the Widmark formula. Estimate your blood alcohol content from drinks, body weight, sex, and time. Updated 2026.