Fast medical calculators with sources, limits, and safety notes.
DoctorCalc helps patients, caregivers, students, and clinicians use transparent calculators for underserved questions in Ramadan health, pediatrics, dental care, pregnancy, nutrition, sports medicine, and clinical formulas.
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Calculator categories
Ramadan & Islamic Health
Fasting safety, hydration planning, medication timing education, and Ramadan-specific health calculators.
Pediatrics
Weight-based pediatric dosing, growth, hydration, and child health calculators with safety-first guidance.
Dental & Orthodontics
Practical tools for dental students, hygienists, orthodontists, and patient education.
Nutrition & Sports Medicine
Hydration, protein, sweat rate, caffeine timing, and sport nutrition calculators.
Pregnancy & Maternal Health
BMI-based pregnancy weight gain, gestational planning, and maternal health calculators with conservative safety notes.
Clinical & Lab Medicine
Source-backed clinical utility calculators for dosing weights, lab interpretation, and common bedside formulas.
General Health & Preventive Medicine
Everyday health screening, body composition, prevention, and wellness calculators with clear limitations.
Popular starting points
Commonly used calculators
Child BMI Percentile Calculator
Calculate BMI-for-age percentile for children and teens using CDC LMS growth-chart data, with BMI category and severe-obesity threshold flags.
eGFR Calculator — CKD-EPI 2021 Creatinine Equation
Estimate adult eGFR using the 2021 CKD-EPI creatinine equation without race coefficient.
Blood Pressure Category Checker
Classify an adult blood pressure reading using ACC/AHA categories, with home-measurement and crisis safety notes.
QTc Calculator — Bazett, Fridericia, Framingham, Hodges
Calculate corrected QT interval from QT duration and heart rate using common correction formulas.
Pediatric Acetaminophen Dose Calculator
Estimate a weight-based pediatric acetaminophen dose range and liquid volume with age, concentration, and overdose-safety guardrails.
Pediatric Ibuprofen Dose Calculator
Estimate a weight-based pediatric ibuprofen dose and liquid volume with age, concentration, dehydration, kidney-risk, NSAID-allergy, and duplicate-NSAID guardrails.
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Featured calculators
Pediatric Acetaminophen Dose Calculator
Estimate a weight-based pediatric acetaminophen dose range and liquid volume with age, concentration, and overdose-safety guardrails.
Pediatric Ibuprofen Dose Calculator
Estimate a weight-based pediatric ibuprofen dose and liquid volume with age, concentration, dehydration, kidney-risk, NSAID-allergy, and duplicate-NSAID guardrails.
Suhoor Hydration Planner
Estimate how to pace a chosen or reference-based beverage target between iftar and suhoor during Ramadan.
Ramadan Caffeine Taper Calculator
Build a gradual caffeine reduction plan before Ramadan to lower the chance of first-day fasting headaches.
Child BMI Percentile Calculator
Calculate BMI-for-age percentile for children and teens using CDC LMS growth-chart data, with BMI category and severe-obesity threshold flags.
Sweat Rate Calculator
Estimate hourly sweat rate from body-weight change, fluid intake, urine output, and exercise duration to plan safer hydration for training.
Baby Teeth Eruption Timeline Calculator
Estimate which baby teeth are usually coming in now, which teeth are typically already present, and which teeth may be next based on a child's age.
Creatine Dose Calculator
Estimate creatine monohydrate loading and maintenance doses from body weight, with practical serving splits and safety notes.
Pregnancy Weight Gain Calculator
Estimate recommended pregnancy weight gain ranges from pre-pregnancy BMI, gestational age, and singleton or twin pregnancy status.
Adult BMI Calculator
Calculate adult body mass index and CDC BMI category from height and weight, with healthy-weight range estimates.
BMR Calculator — Mifflin-St Jeor
Estimate basal/resting metabolic rate with the Mifflin-St Jeor equation using age, sex, height, and weight.
TDEE Calculator
Estimate total daily energy expenditure by multiplying Mifflin-St Jeor resting energy needs by an activity factor.
Body Fat Percentage Calculator — Navy Method
Estimate body fat percentage from circumference measurements using the commonly published U.S. Navy method equations.
Lean Body Mass Calculator
Estimate lean body mass from height and weight using Boer or Hume predictive equations.
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