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Infection prevention tools
Quick references and calculators for infection preventionists and CIC® exam candidates, built on CDC and NHSN sources. Everything runs in your browser.
Isolation & reprocessing
Look up what CDC recommends, fast.
Isolation precautions lookup
Search CDC’s table for the type and duration of precautions for any infection, plus guides for Contact, Droplet and Airborne Precautions.
Open toolSpaulding classification
Spaulding classification explained with an interactive picker: critical, semicritical and noncritical items, the reprocessing each needs, and CDC examples.
Open toolTB skin test interpreter
Interpret a tuberculin skin test (TST/PPD) result: enter the induration in mm and the person’s risk group to apply CDC’s 5, 10 and 15 mm cutoffs.
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Surveillance & daily IP work
The numbers infection preventionists report every month.
CLABSI & CAUTI rate calculator
Calculate CLABSI, CAUTI and other device-associated infection rates per 1,000 device days, plus the device utilization ratio, using NHSN formulas.
Open toolSIR calculator
Calculate a standardized infection ratio (SIR) from observed and predicted infections, with a mid-P exact p-value and 95% confidence interval.
Open toolBleach dilution calculator
Work out how much bleach and water you need for a target ppm of available chlorine, with presets for C. diff (5,000 ppm) and blood spills from CDC.
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Epidemiology calculators
Outbreak and study measures, with the formula and a worked example.
Epi curve generator
Make an epidemic curve in seconds: paste case onset dates, choose days or weeks, and download the chart as SVG or PNG. Runs in your browser; no data uploaded.
Open toolOdds ratio calculator
Calculate an odds ratio and its 95% confidence interval from a 2×2 table, with the formula, a worked outbreak example and how to interpret the result.
Open toolRelative risk calculator
Calculate relative risk (risk ratio) with a 95% confidence interval, attack rates, risk difference and attributable fraction from a cohort 2×2 table.
Open toolSensitivity, specificity & PPV calculator
Calculate sensitivity, specificity, positive and negative predictive value and likelihood ratios from a 2×2 table — or PPV from prevalence.
Open toolIncidence rate calculator
Calculate incidence rate (incidence density) per person-time or patient days, and cumulative incidence (risk), with formulas and CDC examples.
Open toolPrevalence calculator
Calculate point or period prevalence from the number of existing cases and the population, as a percentage or per 1,000 — with the formula and an example.
Open toolAttack rate calculator
Calculate the attack rate and secondary attack rate for an outbreak, with the CDC formulas, worked examples and how to compare food-specific attack rates.
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Exam practice
Check where you stand before the CIC® exam.