Microbiology

Colony counts, dilutions, growth and diagnostic test statistics. 10 free tools.

• CFU per mL Calculator - Colony count converted to CFU per mL.
• Serial Dilution Calculator - Final concentration and volumes for a dilution series.
• McFarland Standard Adjustment Calculator - Diluent needed to bring a suspension to a target turbidity.
• Log Reduction Calculator - Log10 reduction and percent reduction in microbial count.
• Bacterial Doubling Time Calculator - Generations and generation time from two counts.
• Diagnostic Test Accuracy (2x2 Table) Calculator - Sensitivity, specificity, predictive values and likelihood ratios.
• Predictive Value (PPV and NPV) Calculator - Predictive values from sensitivity, specificity and prevalence.
• Malaria Parasite Density (Thick Smear) Calculator - Parasites per microliter of blood.
• Membrane Filter Count (CFU per 100 mL) Calculator - Water testing colony count by membrane filtration.
• Urine Culture Colony Count Calculator - CFU/mL from a calibrated loop.