🔬💊 Phage Calculators

Development Status and Descriptions

by Stephen T. Abedon Ph.D. ([email protected])

phage.org  |  phage-therapy.org  |  biologyaspoetry.org  |  abedon.phage.org  |  google scholar

Version 2026.04.07

Jump to:   📋 Status  |  🧮 Descriptions

This page tracks the development status of the suite of free, browser-based phage biology and phage therapy calculators hosted across phage.org, phage-therapy.org, and their subdomains. All tools are designed to run entirely in the browser with no installation required and no data sent to a server. They are aimed at researchers, students, and clinicians working with bacteriophages, and range from foundational quantitative tools (dilution planning, titer calculation, adsorption kinetics) to more specialized applications (chemostat dynamics, phage therapy dosing, OD deviation analysis). Newer tools conform to a shared template that standardizes layout, tab structure, share bars, and the More Calculators card grid. Legacy tools predate that template and remain on the old phage.org site pending eventual porting or retirement.
✅ Updated Conforms to current common.html ⚠️ Partial Mostly updated; minor items pending 🆕 New Newer tool
🚧 In Progress Under active development 🗄️ Legacy Old-site tool, not yet ported
Emoji Calculator Domain Status Has DOI?
🔬 phage.org tools
🔬 Adsorption Rate Constant Calculator adsorption.phage.org 🆕 New —
🔬💊 Bacterial Half-Life Calculator t05bacteria.phage.org ✅ Updated —
🔬 Bacterial Doubling Time Calculator doublingtime.phage.org 🆕 New Yes
🔬 Biofilm Bacterial Density Calculator biofilm.phage.org ✅ Updated —
🔬 Dilution Calculator dilution.phage.org 🆕 New Yes
🔬 Multiplicity of Infection (MOI) Calculator moi.phage.org 🗄️ Legacy —
🔬 One-Step Growth Calculator onestep.phage.org 🆕 New Yes
🔬 Phage-Bacterial Chemostat Calculator chemostat.phage.org 🚧 In Progress —
🔬 Phage Half-Life Calculator t05phage.phage.org 🗄️ Legacy —
🔬 Phage Name Check Calculator namecheck.phage.org ✅ Updated —
🔬💊 Phage OD Deviation Calculator deviation.phage.org 🆕 New Yes
🔬 Poisson Frequencies Calculator poisson.phage.org 🗄️ Legacy —
🔬 Titering and EOP Calculator titering.phage.org ✅ Updated Yes
💊 phage-therapy.org tools
💊 Active Phage Therapy Calculator active.phage-therapy.org 🗄️ Legacy —
💊 Cross-Resistance Avoider Calculator x-resist-x.phage-therapy.org 🗄️ Legacy —
💊 Inundative Phage Density Calculator inundative.phage-therapy.org 🗄️ Legacy —
💊 Phage Adsorptions Calculator adsorptions.phage-therapy.org ✅ Updated —
💊 Phage Cocktail Optimizer Calculator cocktail.phage-therapy.org 🗄️ Legacy —
💊🔬 Phage Killing Titer Calculator killingtiter.phage-therapy.org ⚠️ Partial —
💊 Phage-Mediated D-Value Calculator dvalue.phage-therapy.org 🗄️ Legacy —
Summary (as of 2026-04-07):   ✅ Updated: 5  |  ⚠️ Partial: 1  |  🆕 New: 5  |  🚧 In Progress: 1  |  🗄️ Legacy: 8
✅ Updated: Bacterial Half-Life, Biofilm Bacterial Density, Phage Name Check, Phage Adsorptions, Titering and EOP
🆕 New: Adsorption Rate Constant, Bacterial Doubling Time, Dilution, One-Step Growth, Phage OD Deviation
Project files present: adsorption, adsorptions, biofilm, chemostat, deviation, dilution, doublingtime, killingtiter, namecheck, onestep, t05bacteria, titering
Template: common.html — Version 2026.04.07

🧮 Phage Biology and Phage Therapy Calculators

A suite of free, browser-based phage biology (🔬) and phage therapy (💊) calculators. Click any card to open that calculator.

💊 Active Phage Therapy
Models phage therapy including in situ phage replication — for scenarios where active (replicative) treatment is expected or required.
phage-therapy.org
🔬 Adsorption Rate Constant
Determine the phage adsorption rate constant k for your phage-host combination. Required for all kinetic calculations.
adsorption.phage.org
🔬 Bacterial Doubling Time
Convert between doubling time and Malthusian parameter; fit growth curves; predict population size over time; and graph bacterial growth data on linear or log scale.
doublingtime.phage.org
🔬💊 Bacterial Half-Life
Time for half a bacterial population to become phage adsorbed, as a function of phage titer and adsorption rate constant.
t05bacteria.phage.org
🔬 Biofilm Bacterial Density
Estimate bacterial density within biofilms — relevant to understanding why Poisson-based phage therapy calculations may differ in biofilm contexts.
phage.org
💊 Cross-Resistance Avoider
Design phage cocktails that minimize the likelihood of cross-resistance — reducing the chance that resistance to one phage confers resistance to others.
phage-therapy.org
🔬 Dilution Calculator
Plan serial dilutions to reach a target titer or plate count, back-calculate titers from plate count data, and learn how exponents and scientific notation work.
dilution.phage.org
💊 Inundative Phage Density
Minimum phage titer to reduce bacteria by a specified amount in a given time. The inundative threshold for passive phage therapy.
phage-therapy.org
🔬 Multiplicity of Infection (MOI)
Calculate MOIinput and MOIactual for phage-bacteria mixtures using Poisson statistics.
phage.org
🔬 One-Step Growth
Calculate phage burst size and latent period from one-step growth experiment data.
onestep.phage.org
💊 Phage Adsorptions
Total adsorptions, MOIactual, and adsorptions per bacterium per unit time, with or without phage replacement.
adsorptions.phage-therapy.org
💊 Phage Cocktail Optimizer
Optimize phage cocktail composition to maximize coverage across target bacterial strains.
phage-therapy.org
🔬 Phage Half-Life
Time for half a phage population to adsorb bacteria, as a function of bacterial density and adsorption rate constant.
phage.org
💊🔬 Phage Killing Titer
Determine phage concentrations from bacterial survival data using Poisson distributions. Includes phage therapy prediction and outcome interpretation.
killingtiter.phage-therapy.org
🔬 Phage Name Check
Check whether a proposed phage name has already been used — essential for avoiding naming conflicts in publications.
namecheck.phage.org
🔬💊 Phage OD Deviation
Detect phage-induced lysis from optical density curves — identifies the point of measurable divergence between treated and control cultures.
deviation.phage.org
🔬 Phage-Bacterial Chemostat
Simulate bacterial and phage population dynamics in continuous culture. Compare steady states and transient dynamics.
chemostat.phage.org
💊 Phage-Mediated D-Value
Time to achieve a given log reduction in bacteria at a constant phage titer, with or without phage replication.
phage-therapy.org
🔬 Poisson Frequencies
Full Poisson distribution of phage adsorptions per bacterium at a given MOI — fractions uninfected, singly infected, multiply infected.
phage.org
🔬 Titering and EOP
Calculate phage titers from plate counts using trimmed means, compute efficiency of plating, and analyze titer statistics.
titering.phage.org
See also
📖 Bacteriophage Glossary
Abedon, S.T. Online glossary of bacteriophage and phage therapy terminology.
preprints.org
Phage Calculators — Status — Stephen T. Abedon — Version 2026.04.07