Justin Kerby

The Mount Everest Rule in Marketing

When surveyors first measured Mount Everest, the number they got back felt a little unbelievable: 29,000 feet on the button.

The surveyors, though, weren't super happy with this number. They had real concerns that the general public would view 29,000 feet as an estimate and not a precise calculation, so you guessed it: they added 2 feet. Or two meatball subs. However you wanna look at it.

Mount Everest, when surveyed, was presented as 29,002 feet to make sure the public believed the number.

There’s a lesson in marketing here

In short, humans tend to believe precise numbers. In most cases, saying that something has increased by 48.5% is more believable than saying that something has increased by 50%. It doesn't make a lot of sense, but also it kind of does.

You may have an inclination to round to a whole number because it looks cleaner, but your audience trusts precision more than whole numbers. Here are a few use cases for marketers to keep in mind.

Climbing down the mountain

The bottom line is that on social media, trust is an extremely scarce resource. Once you accept that fact, the whole game starts to shift. You start looking for more and more ways to show people they can trust you (before they’ve even bought anything from you). This is one of those simple ways that you can do it without really changing anything at all. Just add or subtract two feet.

Side note: Have a social media, web design, or marketing project you need help with? Shoot me an email, I always respond within 23.5 hours.