D Value Calculator

Formula

The formula to calculate the D value is:

\[ \text{D} = \frac{t}{\log(Q1) - \log(Q2)} \]

Where:

D is the D value.
t is the total time that has passed.
Q1 is the initial quantity.
Q2 is the final quantity.

What is a D Value?

A D value is a term used to describe the total time it takes to reduce a quantity by 1 log factor or 90%. This value is most often used in biology to measure decreases in microorganisms over time, but it can also be used in other statistical analyses.

Example Calculation

Let's consider an example:

Total Time (t): 30 minutes
Initial Quantity (Q1): 1000
Final Quantity (Q2): 10

Using the formula to calculate the D value:

\[ \text{D} = \frac{30}{\log(1000) - \log(10)} \approx 10 \text{ minutes} \]

This means that the D value for this scenario is approximately 10 minutes.