Log Reduction
% Reduction
D-Value
Status

Log Reduction Calculator (Biology/Lab)

Compute L = log10(N₀/Nt), percent kill, D-values, and plot kill-curves. Compare scenarios, export CSV/PDF, and share your state via URL.

Primary Scenario
Accepts scientific notation (e.g., 1e7).
Nt
t min
LOD
If Nt < LOD, we report a lower bound for L.
t min
Estimate Nt from plates (if available): Nt ≈ (colonies / plated_volume) × dilution_factor.
Colonies
Dilution
Total dilution factor (e.g., 1e3 for 10⁻³ plated).
Vol mL
t min
D min
If empty, D is estimated from t/L when possible.
Acceptance threshold for log reduction (e.g., 5-log).
Nt (final) Time (min) Note
Replicates assume the same N₀. We compute L per row and report mean ± SD.
Results
Log Reduction
% Reduction
Survivors (Nt)
D-Value
Target L:
CI (replicates):

Kill Curve
If D is provided or estimable (t/L), we plot N(t) ≈ N₀·10−t/D.
Scenario Compare
Name N₀ Mode Nt / LOD t (min) D (min) L (log) % kill Nt (survivors) Pass/Fail

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.