The downside of just making offers is that they’re not useful on their own. People on your list won’t receive any value from you unless they buy what you’re promoting, so they have little reason to stay subscribed. That’s why this email marketing strategy doesn’t work alone. And it’s why many e-commerce sites struggle to keep people interested. There are a few exceptions (e.g., Groupon) that rely entirely on making offers—but then the reason people joined the list was specifically to receive those offers.
Calculators: A calculator offers customers a lot of value with minimal effort on their part and instant gratification. Even a simple price calculator (e.g., “How much does it cost to buy a house?”) can have impressive results: companies report lead conversion increases of more than 25%, plus a nice boost from social traffic. Offering a calculator as a call-to-action is a sign of your intent to solve a customer’s problem and add value, boosting your brand image for customers who aren’t ready to commit.
When it comes to deciding how to craft that perfect subject line, there appears to be really only one area to avoid: the subject line of 60 to 70 characters. Marketers refer to this as the “dead zone” of subject length. According to research by Adestra, which tracked over 900 million emails for its report, there is no increase in either open rate or clickthroughs at this 60-to-70 character length of subject line.