Health & Medical
Health and medical calculators based on published formulas and clinical scores, from BMI and calorie needs to pregnancy dates, lab value conversions and risk scores. Each page names its method and, where available, its sources. They are for information only and do not replace a doctor's assessment.
377 tools · page 1 of 7
- Mean Arterial Pressure Calculator Computes mean arterial pressure (MAP), the average pressure in your arteries over one cardiac cycle, from your systolic and diastolic readings.
- BMI Calculator Body mass index from height and weight (metric or imperial).
- BMR Calculator (Basal Metabolic Rate) Basal metabolic rate and daily calorie needs using the Mifflin-St Jeor equation.
- Blood Alcohol Content (BAC) Calculator Estimate blood alcohol content (per mille) with the Widmark formula from weight, sex, drinks and time elapsed. Estimate only.
- Corrected QT (QTc) Calculator Calculates the heart-rate-corrected QT interval (QTc) from a measured QT interval and heart rate using Bazett's formula.
- TDEE Calculator (Total Daily Energy Expenditure) Daily calorie needs and weight-loss / maintenance / gain targets from age, height, weight and activity.
- A1c to Average Glucose Calculator Convert HbA1c to estimated average glucose.
- Waist-to-Hip Ratio Calculator Calculate your waist-to-hip ratio (WHR) and health risk level from your waist and hip measurements.
- Creatinine Clearance Calculator Estimate creatinine clearance (kidney function) with the Cockcroft-Gault formula from age, weight, sex and serum creatinine.
- HOMA-IR Calculator Estimate insulin resistance with HOMA-IR from fasting glucose (mg/dL) and fasting insulin.
- Ovulation Calculator Estimate your ovulation day, fertile window and next period date from your last period date and cycle length.
- Ideal Weight Calculator Ideal weight by height and sex (4 formulas + BMI range).
- BAC Decline Over Time Calculator Estimate your blood alcohol content after a number of hours and how long until you reach 0.00%, using a 0.015%/hr elimination rate.
- Daily Sugar Intake Calculator Calculate your daily sugar grams from calories and percentage.
- Estimated Blood Volume Calculator Estimates total blood volume from height, weight and sex using Nadler's equations.
- FIB-4 Index Calculator Calculate the FIB-4 liver fibrosis index.
- FFMI Calculator Calculate fat-free mass index from weight, height and body fat.
- Pregnancy Weight Gain Target Calculator Estimates the recommended total pregnancy weight gain range from your pre-pregnancy BMI using IOM guidelines.
- Positive Predictive Value Calculator Computes positive and negative predictive value, sensitivity and specificity from a 2×2 confusion matrix.
- Glycemic Load Calculator Computes glycemic load from a food's glycemic index and available carbohydrate per serving, indicating its real impact on blood sugar.
- Sensitivity & Specificity Calculator Calculate sensitivity, specificity and accuracy of a diagnostic test from a confusion matrix.
- Conception Date Calculator Enter your estimated due date to estimate the date you likely conceived, plus the probable implantation window and the day of the week conception occurred.
- LDL Cholesterol Calculator Calculates LDL ('bad') cholesterol from total cholesterol, HDL, and triglycerides using the Friedewald equation (mg/dL).
- Sleep Cycle Calculator Plan your bedtime or wake time around 90-minute sleep cycles.
- Body Surface Area (BSA) Calculator Calculate your body surface area (BSA) from height and weight using the Mosteller and Du Bois formulas.
- BMI Prime Calculator Calculate BMI Prime, your BMI relative to the upper normal.
- Waist-to-Height Ratio Calculator Calculate your waist-to-height ratio and health category from your waist circumference and height.
- Pregnancy Due Date Calculator Estimated due date and current week from your last menstrual period (LMP).
- Body Water Calculator Estimate your total body water from weight and sex.
- Daily Protein Intake Calculator Calculate your daily protein requirement (grams) from your body weight and activity goal.
- Delta Ratio Calculator Compute the delta ratio (delta-delta) from anion gap and bicarbonate to assess mixed metabolic acid-base disorders. Not medical advice.
- Schwartz Pediatric eGFR Calculator Estimate a child's glomerular filtration rate with the bedside Schwartz formula.
- Cholesterol Ratio Calculator Calculate your total-to-HDL cholesterol ratio and risk category.
- Daily Water Intake Calculator Recommended daily water from body weight, activity level and climate.
- Lean Body Mass (LBM) Calculator Calculate lean body mass and fat mass from your sex, height and weight using the Boer formula.
- Macro Calculator Split your daily calories into protein, carbs and fat in grams and percentages.
- Pack-Years Calculator Estimates total tobacco exposure in pack-years, a standard measure used to assess smoking-related health risk.
- Anion Gap Calculator Calculate the serum anion gap.
- Daily Fiber Intake Calculator Calculate your recommended daily fiber from your calorie intake.
- Fractional Excretion of Sodium (FENa) Calculator Calculate FENa from urine and plasma sodium and creatinine for AKI workup.
- Glucose to A1c Calculator Estimate HbA1c from average blood glucose.
- eGFR (MDRD) Calculator Estimates glomerular filtration rate with the 4-variable MDRD equation from creatinine, age, sex and race; for education only, not medical advice.
- Daily Carb Intake Calculator Calculate your daily carbohydrate grams from calories and percentage.
- Goal Weight Timeline Calculator Estimate how long it will take to reach your goal weight from your current weight and a daily calorie deficit.
- Macro Split Calculator Calculate grams of protein, carbs and fat from your daily calories and a percentage split.
- Ponderal Index Calculator Calculate the ponderal index (weight relative to height cubed).
- Alcohol Units Calculator Calculate total alcohol units and grams of pure alcohol from drink volume, ABV and number of drinks.
- A–a Gradient Calculator Calculate the alveolar–arterial oxygen gradient from FiO₂, PaCO₂ and PaO₂.
- Blood Pressure Category Calculator Classifies a systolic/diastolic reading into the American Heart Association categories: Normal, Elevated, Stage 1, Stage 2, or Hypertensive Crisis. Not medical advice.
- MELD Score Calculator Calculate the MELD score for end-stage liver disease from bilirubin, INR and creatinine.
- RMR (Katch-McArdle) Calculator The Katch-McArdle formula estimates resting metabolic rate (RMR) from your lean body mass: RMR = 370 + 21.6 × LBM (kg). Enter your weight and body fat percentage to get daily resting calories plus sedentary and active maintenance estimates.
- Calorie Deficit Calculator Estimate weight loss from a daily calorie deficit over a number of days (7700 kcal ≈ 1 kg fat).
- Relative Risk Calculator Calculate the relative risk (risk ratio) from a 2×2 contingency table.
- Resting Metabolic Rate (Harris-Benedict) Calculator Estimate your resting metabolic rate (RMR) — the calories your body burns at rest each day — using the revised Harris-Benedict equation from sex, weight, height and age.
- Adjusted Body Weight Calculator Calculate adjusted body weight for medication dosing.
- eGFR CKD-EPI 2021 Calculator Estimates glomerular filtration rate (eGFR) with the race-free 2021 CKD-EPI creatinine equation and reports the CKD stage. For education only — not medical advice.
- Winter's Formula Calculator Calculate the expected PaCO₂ for metabolic acidosis using Winter's formula.
- Osmolar Gap Calculator Calculate the osmolar gap from measured osmolality, sodium, glucose and BUN.
- APGAR Score Calculator Calculate the APGAR score of a newborn from its five components (each 0–2).
- CURB-65 Score Calculator Calculate the CURB-65 pneumonia severity score from its five clinical criteria (each 0 or 1).