ROI is not always straightforward, but this calculator will do the math for you on a simple ROI question such as the outcome of an advertising campaign, business closed as a result of a trade show exhibit, or customer value gained by membership in a referral network.

Enter the total (gross) amount of money you spent (Investment) in the first box. Enter the total revenue generated as a result (Return) of the money you spent. Hit Calculate and bam!

For example: If you’re trying to determine the value of a one-year membership in a networking group or Chamber of Commerce, you’ll need to know the annual membership cost (Investment) and the total gross revenue generated by all customers referred to you in that year by group members (Return). So:

Investment: One year membership cost = $1,000
Return: Gross revenue from all referred customers in that year: $30,000
ROI = $29,000