Free clinical & public health tools

Body Mass Index with WHO classifications, ideal weight range, and health interpretation. Metric and imperial units.

10-year cardiovascular risk using AHA/ACC Pooled Cohort Equations. Statin therapy thresholds included.

Basic Life Support step-by-step algorithm per AHA 2020 guidelines. Adult, child, and infant protocols.

VFib/VTach, PEA/Asystole, Bradycardia, Tachycardia management with full medication protocols.

Age-by-age milestones for motor, language, and social development. Includes red flags and referral criteria.

Estimated due date by LMP (Naegele's rule) or conception date. Shows gestational age, trimester, and key milestones.

Calculate incidence rate, period prevalence, attack rate, and case fatality ratio from population data.

2×2 table calculator for OR, RR, ARR, NNT with 95% confidence intervals. Covers case-control and cohort studies.

Decision tree to select the right study design for any research question — from RCT to ecological study.

Searchable glossary of key epidemiology terms with plain-language explanations and examples.

Quick reference for all major bias types — selection, information, confounding — with examples and control methods.

Required sample sizes for trials and observational studies. Inputs: power, alpha, effect size, outcome type.

95% and 99% CIs for means, proportions, OR, and RR. Includes plain-language interpretation guidance.

Answer questions about your data type and study design — get the right statistical test recommended.

Complete formula reference for exams and research. Sensitivity, OR, NNT, Bayes, survival analysis, and more.