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Seasonal Index Calculator

Formula

The formula to calculate the seasonal index (SI) is:

$SI = \left( \frac{S}{A} \right) \times 100$

Where:

$SI$ is the Seasonal Index (%)
$S$ is the Total Sales for a Specific Season ($)
$A$ is the Average Sales for All Seasons ($)

What is a Seasonal Index?

A Seasonal Index is a statistical tool used to measure and quantify the recurring patterns or variations in data that occur regularly within a year. It is often used in sales forecasting, economic forecasting, and inventory management to account for seasonal fluctuations like holiday shopping or seasonal weather changes. The index provides a numerical value that helps in adjusting data to reflect the relative period-to-period changes due to seasonality.