Contact trade association: Contact the premier trade
association in your industry and get the information from them
about if they tract the sales numbers for the business which are
similar to your organization. if they don't track ask them if there
is any new other metrics are used in the new companies for
estimating the sales.
find a comparable organization selling the comparable
product.
Do the research and internet search in order to find the
articles and magazines which focus on your business industry. These
articles also may tell about sales experience.
Multiplication method: It is a method to arrive at the
reasonable number. while considering this method you need to
consider several business industries and condut the primary search
for better estimation.