Now that you have described your products, services, customers, markets, and marketing plans in detail, it’s time to attach some numbers to your plan. Use a sales forecast spreadsheet to prepare a month-by-month projection. The forecast should be based on your historical sales, the marketing strategies that you have just described, your market research, and industry data, if available.

You may want to do two forecasts: 1) a "best guess", which is what you really expect, and 2) a "worst case" low estimate that you are confident you can reach no matter what happens.

Remember to keep notes on your research and your assumptions as you build this sales forecast and all subsequent spreadsheets in the plan. This is critical if you are going to present it to funding sources.