Medical Calculators
Free, evidence-based clinical calculators with interpretation guidance. All formulas are referenced from peer-reviewed literature and clinical guidelines.
Renal
2 tools
General
3 tools
BMI
Calculate Body Mass Index (BMI) with WHO classification. Includes interpretation for adults and clinical considerations.
Corrected Ca
Calculates albumin-corrected calcium to estimate true calcium levels in patients with hypoalbuminemia.
MME Calculator
Calculate total daily morphine milligram equivalents (MME) to assess opioid overdose risk. Based on CDC opioid prescribing guidelines.
Mental Health
2 tools
PHQ-9
Patient Health Questionnaire-9 (PHQ-9) for depression screening and severity assessment. Validated tool for clinical use.
GAD-7
Generalized Anxiety Disorder 7-item (GAD-7) scale for anxiety screening and severity assessment. Validated clinical tool.
Cardiovascular
7 tools
Framingham
Estimates 10-year cardiovascular disease (CVD) risk using the Framingham Heart Study algorithm. Calculates risk based on age, sex, cholesterol levels, blood pressure, smoking status, and diabetes.
CHAβDSβ-VASc
Calculates stroke risk in patients with atrial fibrillation to guide anticoagulation therapy decisions. Recommended by ACC/AHA/ESC guidelines.
Wells DVT
Calculates the probability of deep vein thrombosis (DVT) using the Wells criteria to guide diagnostic testing decisions.
ASCVD Risk
Calculates 10-year atherosclerotic cardiovascular disease (ASCVD) risk using the ACC/AHA Pooled Cohort Equations to guide statin therapy decisions.
HAS-BLED
Calculates bleeding risk in patients with atrial fibrillation on anticoagulation to help guide therapy decisions alongside stroke risk assessment.
Wells PE
Calculates the pre-test probability of pulmonary embolism (PE) using the Wells criteria to guide diagnostic testing decisions.
QTc
Calculates corrected QT interval (QTc) using multiple formulas to assess risk of torsades de pointes and guide medication management.
Emergency
10 tools
TIMI Score
Calculate the TIMI Risk Score for Unstable Angina/Non-ST Elevation MI (UA/NSTEMI). 7-factor risk stratification tool with 14-day event rates for death, MI, or urgent revascularization.
HEART Score
Calculate the HEART Score for chest pain risk stratification. Predicts 6-week MACE risk (death, MI, revascularization) in emergency department patients with undifferentiated chest pain.
PERC Rule
Apply the PERC Rule to rule out pulmonary embolism without D-dimer or imaging in low-risk ED patients. 8-criteria clinical decision tool with a false-negative rate of only 1.0%.
NIHSS
Free online NIHSS calculator with guided scoring for all 15 items. Instant stroke severity classification, tPA eligibility assessment, and thrombectomy threshold guidance.
qSOFA
Free qSOFA calculator for bedside sepsis screening. 3 criteria β respiratory rate, blood pressure, mental status β with instant interpretation, SIRS comparison, and Hour-1 Bundle guidance.
SOFA Score
Free SOFA score calculator for ICU organ dysfunction assessment. 6 organ systems with mortality prediction, Sepsis-3 criteria evaluation, and delta-SOFA guidance.
APACHE II
Free APACHE II calculator with all 12 physiologic variables, age points, and chronic health evaluation. Instant ICU mortality estimation with severity classification.
Ottawa Ankle Rules
Free Ottawa Ankle & Foot Rules calculator with combined ankle and midfoot criteria. Instant X-ray recommendation based on the most validated clinical decision rule in emergency medicine (sensitivity 97.6%).
Ottawa Knee Rule
Free Ottawa Knee Rule calculator with all 5 criteria plus Pittsburgh Knee Rules comparison. Instant X-ray recommendation for acute knee injuries. Sensitivity 98β100%, validated in 7,000+ patients.
Parkland Formula
Free Parkland burn formula calculator with hourly infusion rates, Rule of Nines reference, Modified Brooke comparison, and urine output targets. Instant fluid resuscitation plan for burn injuries.
Clinical Disclaimer
These calculators are provided for educational and clinical decision support purposes only. Results should be interpreted in the context of individual patient circumstances. Always use clinical judgment and consult relevant guidelines. These tools do not replace professional medical advice, diagnosis, or treatment.
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