Medical Calculators

Access a comprehensive set of medical calculators designed to support clinical assessment, treatment planning, and diagnostic evaluation. From cardiology and pharmacology to metabolism and lifestyle risk factors, these tools help healthcare professionals and informed individuals make data-driven decisions for better health outcomes.

Drug Abuse Screening Test

This Drug Abuse Screening Test helps evaluate the potential presence of substance misuse. It is useful for healthcare professionals, counselors, or individuals seeking to understand risk levels associated with drug use. Based on a series of 20 yes/no questions, the test calculates a score that reflects the likelihood of substance abuse and suggests the need for further evaluation.

Corrected Sodium (Hyperglycemia)

This calculator estimates the corrected sodium level in patients with hyperglycemia using the Katz and Hillier methods. It’s particularly useful for clinicians managing electrolyte imbalances in diabetic or critically ill patients. The tool adjusts the measured sodium concentration based on elevated blood glucose levels, helping guide more accurate diagnosis and treatment.

Half-Life Time

This calculator helps determine the half-life (t½) of a medication in the body, which is the time it takes for its concentration to reduce by half. It’s useful for healthcare professionals, pharmacologists, and students to understand drug clearance and dosing intervals. The calculation is based on the initial concentration (Ao) and the elimination rate constant (Ko).

Free Water Deficit – Hypernatremia

This calculator helps determine the free water deficit in patients with hypernatremia based on their total body water (TBW) and serum sodium levels. It is useful for healthcare professionals managing dehydration and electrolyte imbalances. By selecting the patient type and entering their weight and sodium values, the tool calculates how much free water is needed to correct sodium concentration.

Dialysis Dose (Kt/V)

This calculator helps estimate the dialysis dose using the Kt/V formula, a key metric in assessing dialysis adequacy. It is useful for nephrologists, clinicians, and patients undergoing hemodialysis. Simply enter post/pre BUN levels, ultrafiltration volume, and patient weight to get the Kt/V value.

Dextrose Intravenous Target Concentration

This calculator determines the final target concentration of dextrose when mixing two IV solutions with different dextrose concentrations. It is useful for healthcare professionals when adjusting intravenous dextrose levels for patient-specific needs. Simply input the volume and concentration of each solution to compute the resulting mixture’s dextrose percentage.

Clinical Dehydration Scale

This Clinical Dehydration Scale calculator helps assess the severity of dehydration in patients, particularly in children, using observable clinical signs. It is based on the Goldman scale, which evaluates parameters such as general appearance, eyes, mucous membranes, and tears. Useful for healthcare professionals, it allows for quick triage and appropriate fluid replacement decisions.

Antiscalant Dosing

Use this calculator to determine the appropriate amount of antiscalant needed for a reverse osmosis (RO) system. It's essential for plant operators, engineers, and technicians to ensure optimal performance, prevent scaling, and extend membrane life. Input your system parameters and get accurate dosing rates in mL/min, gallons/day, and total weight.

Carboplatin AUC Dose

This calculator determines the appropriate dose of carboplatin chemotherapy based on the Calvert formula using patient-specific data such as gender, age, weight, serum creatinine, and the target AUC. It’s a useful tool for oncologists and pharmacists to personalize cancer treatment by estimating the Glomerular Filtration Rate (GFR) and calculating the precise carboplatin dosage.

Dosage Infusion

This calculator helps healthcare professionals determine the correct infusion rate for intravenous medications. By entering the prescribed dose, standard volume, standard dose, and duration of infusion, the tool calculates the required rate in mL per hour or minute. It’s especially useful in clinical settings where accuracy and speed are critical.

Liquid Dose

This calculator helps determine the correct liquid medication dose based on the ordered dose, standard dose, and standard dosage unit. It’s useful for healthcare professionals, pharmacists, and caregivers to ensure accurate administration of liquid medicines. Just enter the ordered and standard values, and the calculator will compute the required liquid volume.

Tablet Dose

This calculator helps healthcare professionals and caregivers determine how many solid medication tablets to administer based on the prescribed dose and the available dosage strength. It’s especially useful in clinical and pharmacy settings where accurate medication dosing is crucial for patient safety.

Mean Arterial Pressure

MAP is a critical value in assessing adequate blood flow to vital organs, especially in patients with sepsis, shock, or head injury. Typically, a MAP of at least 60 mmHg is required to maintain perfusion to organs. For example, a patient with SBP of 120 mmHg and DBP of 80 mmHg would have a MAP of (120 + 2×80)/3 = 93.3 mmHg. This tool simplifies the manual calculation process and helps in making quick clinical decisions.

Framingham Heart Disease Risk

This calculator estimates the 10-year risk of developing cardiovascular disease (CVD) using the Framingham Risk Score model. It evaluates factors such as age, gender, cholesterol levels, blood pressure, smoking, and diabetes status to provide a percentage-based risk of heart attack or related events in adults over 20 years old.

Ejection Fraction

A simple and effective tool to calculate Left or Right Ventricular Ejection Fraction (EF) based on stroke volume and end-diastolic volume. This calculator helps assess heart function by determining the percentage of blood ejected from the ventricles during each heartbeat. It’s particularly useful for cardiologists, healthcare providers, and patients monitoring cardiac performance.

Framingham Stroke Risk

This Framingham Stroke Risk Calculator estimates the 10-year probability of stroke based on clinical data including age, gender, blood pressure, smoking status, diabetes, cardiovascular conditions, and use of antihypertensive treatment. It’s a valuable tool for healthcare professionals and patients to assess and monitor stroke risk in both men and women.

Cardiac Output (Fick Method)

This calculator estimates cardiac output in liters per minute using the Fick method. It is especially useful for clinicians to assess the pumping efficiency of the heart based on oxygen consumption, hemoglobin concentration, and oxygen saturation. By inputting the patient’s body surface area (BSA), hemoglobin (Hgb), arterial (SaO₂) and venous (SvO₂) oxygen saturation, you can get a non-invasive approximation of cardiac output.

CHA₂DS₂-VASc Score

The CHA₂DS₂-VASc Score is a clinical tool used to estimate the risk of stroke in patients with non-valvular atrial fibrillation (AF). This calculator helps healthcare providers determine whether anticoagulation therapy is recommended. Based on risk factors such as age, gender, and medical history, a higher score indicates a greater stroke risk.

Aortic Valve Area

Heart Blood Volume

The Heart Blood Volume Calculator helps estimate the total volume of blood pumped by the heart over time, based on your heart rate and expected lifespan. It provides values in gallons, liters, and barrels, as well as a breakdown by year, month, week, and day. This tool is useful for educational, physiological, or health-awareness purposes.

Pulmonary Vascular Resistance

This Pulmonary Vascular Resistance (PVR) calculator estimates the resistance offered by the pulmonary vasculature using mean pulmonary artery pressure (PAP), pulmonary capillary wedge pressure (PCWP), and cardiac output (CO). It is useful for healthcare professionals to assess conditions like pulmonary hypertension and right heart dysfunction.

Corrected QT Interval (QTc)

The Corrected QT (QTc) Interval Calculator helps estimate the heart’s electrical recovery time adjusted for heart rate. It’s especially useful for evaluating patients with potential arrhythmias or on medications that prolong QT interval. Enter QT and R-R interval to get QTc using Bazett’s formula.

Target Heart Rate

This Target Heart Rate Calculator helps determine the optimal pulse range during physical exercise based on your age and resting heart rate. It’s particularly useful for athletes, fitness enthusiasts, and health professionals to monitor cardiovascular intensity and ensure workouts remain within a safe and effective zone.

Intermittent Claudication Risk Score

This Intermittent Claudication Risk Score Calculator helps assess the likelihood of developing symptoms of peripheral artery disease (PAD) over the next 4 years. Based on risk factors such as age, cholesterol, hypertension, diabetes, smoking, and coronary heart disease (CHD), it estimates the probability of experiencing intermittent claudication, a key indicator of early-stage PAD. A higher score indicates greater risk.

QTc Interval

This QTc Interval Calculator helps estimate the corrected QT interval (QTc) from the measured QT interval and heart rate (HR). It is commonly used in cardiology to assess risk for arrhythmias like Torsades de Pointes. By inputting QT duration and heart rate, the tool applies Bazett’s formula to provide the QTc value.

TIMI Risk Index

This calculator estimates the TIMI Risk Index, a simple bedside score used to assess the risk of mortality in patients with ST-elevation myocardial infarction (STEMI). Based on age, heart rate, and systolic blood pressure, it helps clinicians quickly evaluate a patient’s prognosis and prioritize interventions.

Right Ventricular Stroke Work Index

This calculator estimates the Right Ventricular Stroke Work Index (RVSWI), a key hemodynamic parameter used to assess right ventricular performance in patients with heart failure, pulmonary hypertension, or undergoing cardiac surgery. It uses stroke volume index (SVI) and mean pulmonary artery pressure (MPAP) to calculate the RVSWI value.

Arterial Blood Gas

This medical calculator helps you analyze Arterial Blood Gas (ABG) values for a better understanding of a patient’s respiratory and metabolic status. It interprets pH, PaCO₂, and HCO₃⁻ levels to determine the type of acid-base disturbance and compensation status.

Urine Albumin-Creatinine Ratio (UACR)

This calculator helps assess kidney function by calculating the urine albumin-to-creatinine ratio (UACR). It’s a standard test for detecting early kidney damage, especially in individuals with diabetes or hypertension.

Total Parenteral Nutrition (TPN)

This calculator helps determine the total nutritional needs of patients requiring parenteral (IV) nutrition. It estimates Basal Energy Expenditure (BEE), Ideal Body Weight (IBW), macronutrient distribution (lipids, dextrose, protein), nitrogen balance, and the non-protein calorie-to-nitrogen ratio.

Systemic Vascular Resistance (SVR)

This calculator estimates Systemic Vascular Resistance (SVR), a key measure of afterload and vascular tone. It uses mean arterial pressure (MAP), central venous pressure (CVP), and cardiac output (CO) to assess blood flow resistance within systemic circulation.

Resting Metabolic Rate (RMR)

This calculator estimates your Resting Metabolic Rate (RMR) — the number of calories your body needs at rest to maintain vital functions like breathing, circulation, and cell production. It's based on weight, height, age, and gender using the Mifflin-St Jeor equation.

Nicotine Level

This calculator estimates your daily nicotine intake based on the number of cigarettes you smoke and the average nicotine content per cigarette. It's a helpful tool for smokers to understand their nicotine exposure and consider reduction strategies.

Mifflin-St Jeor BMR

This calculator estimates your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor Equation. It provides the number of calories your body needs at rest based on your age, gender, weight, and height—essential for weight management and nutrition planning.

Karvonen Heart Rate

This calculator estimates your target heart rate for exercise using the Karvonen formula. It considers your age, resting heart rate, intensity percentage, and gender to calculate personalized training zones for optimal cardiovascular performance.

IV Flow Rate

This calculator determines the intravenous fluid flow rate based on the total volume to be infused, infusion time, and a flow factor. It’s a valuable tool for healthcare providers to ensure accurate and consistent fluid administration.

IV Drip Rate

This calculator helps determine the appropriate drip rate for intravenous fluid administration. Based on the volume to be infused, drop factor, and duration, it calculates the required drops per minute for accurate manual IV delivery.

Heart Rate Calorie Burn

This calculator estimates how many calories you burn during exercise based on your heart rate, weight, age, duration, and gender. It provides a personalized calculation using scientifically validated formulas for males and females.

Heart Beats Since Birth

This calculator estimates how many times your heart has beaten since you were born. Based on your birth date and average resting heart rate, it provides a fun and fascinating insight into your body's lifelong activity.

Hardy-Weinberg Equilibrium

This genetics calculator determines allele frequencies and expected genotype frequencies under Hardy-Weinberg equilibrium. It also calculates the chi-square statistic to test whether a population is in genetic equilibrium.

Blood Type Inheritance

This calculator determines possible parent blood groups based on a child's blood type. It helps explore the genetic inheritance patterns of ABO and Rh blood groups between parents and offspring.

E-Juice Mixing

This calculator helps you mix your own e-liquid by calculating the exact amounts of nicotine base, PG, VG, and flavoring needed. Enter your desired nicotine strength, target volume, and flavor percentage to get a customized e-juice recipe.

IV Drops Per Minute

This calculator determines the required number of IV drops per minute for fluid administration. Based on the total volume, drop factor, and time, it helps ensure accurate infusion rates during intravenous therapy.

Type 2 Diabetes Insulin Level

This calculator estimates insulin level requirements for individuals with Type 2 Diabetes Mellitus. By inputting your weight, height, fasting blood glucose (FBG), and an adjustment factor, it provides a personalized estimate to support diabetic health monitoring.

Cigarette Expense

This calculator helps you estimate how much money you spend on smoking daily, monthly, and yearly. By understanding the financial impact of your smoking habit, you can take steps to reduce or quit for both your health and your wallet.

Cockcroft-Gault Creatinine

This calculator estimates creatinine clearance (CrCl) using the Cockcroft-Gault equation. It helps assess kidney function based on age, weight, serum creatinine, and gender, making it a valuable tool in medication dosing and renal function monitoring.

Specific Absorption Rate (SAR)

This calculator determines the Specific Absorption Rate (SAR), which measures the rate at which the body absorbs energy from an electromagnetic field. It's primarily used to evaluate radiation exposure from devices like mobile phones.

BUN to Creatinine Ratio

This calculator determines the ratio between Blood Urea Nitrogen (BUN) and serum creatinine levels. It's a valuable diagnostic tool used to assess kidney function and identify the underlying cause of acute kidney injury.

Bruce Protocol VO₂ Max

This calculator estimates VO₂ max using the Bruce Protocol treadmill stress test. It measures cardiovascular endurance based on exercise duration and provides an approximation of oxygen uptake (mL/kg/min), helping athletes and clinicians evaluate heart and lung fitness.

Breath Counter Since Birth

This fun health calculator estimates how many breaths you have taken since the day you were born. Simply enter your birth date, and the tool will calculate your total number of breaths based on an average respiration rate.

Blood Pressure Range

This calculator helps you assess your blood pressure levels by entering systolic and diastolic values. It determines whether your blood pressure is normal, elevated, or within hypertensive stages, offering a quick and easy way to monitor cardiovascular health.

Blood Alcohol Content (BAC)

This calculator estimates your Blood Alcohol Content (BAC) or Blood Alcohol Level (BAL) based on your weight, gender, the number of drinks consumed, and the time elapsed. It helps you understand your level of intoxication and potential impairment after alcohol consumption.

Medical Calculators

Cardiology

Diagnostics

Infusion

Lifestyle

Metabolism

Pharmacology