Enter the slope into the calculator to determine the qpcr Efficiency.

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## qpcr Efficiency Formula

The following formula is used to calculate the qpcr Efficiency.

E = -1 + 10 ^ {-1/S}

**E = -1 + 10 ^ (-1/S)**

- Where E is the qpcr Efficiency (%)
- S is the slope

To calculate the QPCR efficiency, raise 10 to the power of the negative inverse of the slope, then subtract 1 from the result.

## How to Calculate qpcr Efficiency?

The following two example problems outline how to calculate the qpcr Efficiency.

**Example Problem #1:**

- First, determine the slope. In this example, the slope is given as 1.5.
- Finally, calculate the qpcr Efficiency using the equation above:

E = -1 + 10 ^ (-1/S)

Inserting the values from above and solving the equation:

E = -1 + 10 ^ (-1/1.5) = .784 (%)

**Example Problem #2: **

Using the same process as above, first define the variables required by the formula. In this case, these values are:

slope = 4.5

Entering these values yields:

E = -1 + 10 ^ (-1/4.5) =-.40 (%)