Monthly Growth = (1 + Yearly Growth)^(1/12) - 1
Forecast = Base Sales × Seasonal Factor
Next Month = Previous Month × (1 + Monthly Growth)
Example:
Base Sales: 1000, Growth: 12 %, Seasonal Factor: 1.2
Monthly Growth = (1 + 0.12)^(1/12) - 1 = 0.00949First Month = 1000 × 1.2 = 1200Second Month = 1000 × (1 + 0.00949) × 0.8 = 815