Health Calculators

Calculate your BMI from height and weight in feet/inches or centimetres. See your CDC weight category, BMI Prime, and the healthy weight range for your height.

Estimate your body fat percentage from tape measurements using the US Navy formula. See your fat mass, lean mass, and where you sit against ACE fitness categories.

See your ideal body weight by the Devine, Robinson, Miller, and Hamwi formulas, alongside the healthy BMI weight range clinicians actually use.

Divide your waist by your height to assess central body fat — the measure NICE recommends alongside BMI, using a single 0.5 threshold that works across sexes.

Find how many calories to eat per day to lose, maintain, or gain weight, with targets at every rate of change and a safety floor for very low intakes.

Work out how many calories you burn per day from your BMR and activity level, and see your TDEE at every activity level side by side.

Calculate your basal metabolic rate with the Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle equation, and see how the three compare for your body.

Split your daily calories into protein, carbohydrate, and fat targets in grams, across balanced, high-protein, low-carb, keto, and high-carb styles.

Find how much protein to eat per day in grams, based on your body weight, age, and whether you are maintaining, building muscle, or losing fat.

Work out how much water to drink per day from your body weight, exercise, and climate — in cups, fluid ounces, and litres.

Find your ovulation day and fertile window from your last period and cycle length. Shows your next three cycles and the due date if you conceive.

Estimate your due date from your last period, a conception date, or an IVF embryo transfer. Shows gestational age, trimester, and every key milestone date.

Predict your next six period start and end dates from your cycle length and last period. Includes your estimated ovulation date and what counts as a normal cycle.

Estimate when you conceived from your due date or your last period. Shows the probable conception window, the most likely days, and how accurate the estimate is.

How much weight to gain in pregnancy, based on your pre-pregnancy BMI and the IOM/NASEM 2009 guidelines. Singleton and twin ranges, with a week-by-week target.

Find how many weeks and days pregnant you are from your last period or due date. Shows your trimester, embryonic age, days left, and every screening milestone.

Take the nine-question PHQ-9 depression screener and get your 0–27 score with its severity band, from minimal to severe. A screening questionnaire, not a diagnosis.

Take the seven-question GAD-7 anxiety screener and get your 0–21 score with its severity band. A score of 10 or more is the usual referral threshold. Screening, not diagnosis.

Answer the three AUDIT-C questions and get your 0–12 score against the sex-specific threshold: 4 or more for men, 3 or more for women. A screening tool, not a diagnosis.

Work out what time to go to bed to wake up refreshed, or what time to wake after a given bedtime. Counts whole 90-minute sleep cycles and the time it takes to fall asleep.

Estimate glomerular filtration rate from serum creatinine, age and sex using the race-free CKD-EPI 2021 equation. Enter mg/dL or µmol/L and see the KDIGO stage.

Convert HbA1c to estimated average glucose, or average glucose back to A1c, using the ADAG equation. Results in %, mg/dL, mmol/L and IFCC mmol/mol.

Calculate mean arterial pressure and pulse pressure from a systolic and diastolic reading, with the ACC/AHA 2017 blood pressure category and the 65 mmHg perfusion target.

Adjust total serum calcium for albumin using the Payne formula, in mg/dL or SI units. See the corrected value in both scales, plus why ionised calcium is the reference standard.

Score stroke risk in non-valvular atrial fibrillation. Age and sex points are derived automatically, with the adjusted annual stroke rate and the guideline anticoagulation threshold.