Forecasting Method 6: Flat Percent Derived From Comparing the 13th to the 1st Month

The system estimates sales by comparing sales for the 13thto the 1stmonth when 13 months of sales figures are available. To calculate this month's estimated sales, use the percentage increase or decrease multiplied by this month's sales for the year.

This forecasting method uses this calculation:

Monthly Estimate = (Sales This Month Last Year × Sales for 13thmonth) ÷ Sales for 1stmonth