A measure of how much revenue emails are bringing in compared to the investment in those emails. Calculated by revenue generated by email marketing divided by the money invested into email marketing. (The result can then be multiplied by 100 to express as a percentage.) Email marketing famously has a high ROI; two frequently cited stats peg it at an average of 3,800 percent to 4,400 percent—in other words, $38 to $44 for every $1 spent.

A measure of how much revenue emails are bringing in compared to the investment in those emails. Calculated by revenue generated by email marketing divided by the money invested into email marketing. (The result can then be multiplied by 100 to express as a percentage.) Email marketing famously has a high ROI; two frequently cited stats peg it at an average of 3,800 percent to 4,400 percent—in other words, $38 to $44 for every $1 spent.