This Calculator Tells You EXACTLY How Much Sleep You’ve Lost Since You Had Kids

It takes a village to raise a child—an incredibly sleep-deprived village, that is. And thanks to the Lost Sleep Calculator, parents can know precisely how many hours of zzz’s have been lost, thanks to their little bundles of joy!

Hillary’s, a British interior design company, has created an intuitive tool which is as simple to use as assembling a crib— actually, scratch that, that’s a horrible analogy. It’s really easy to use.

When you pull up the site, you are greeted by a sickle moon spooning a star and prompted to enter the age of each of your children in years and months, up to ten total. Then you hit the “calculate my lost sleep button,” and you’re off on a magic carpet ride of under-eye bags and parenting stats.