About SleepTimeCalc

SleepTimeCalc started with one question people ask every night: what time should I go to bed? The sleep calculator on the homepage answers it in one tap. The other tools cover the questions that come next: naps, caffeine, sleep debt, jet lag and how much sleep you really need.

Completely free, and private

Every tool is completely free. There's no account, no app to download, and no email. The calculations run in your browser on your own device, so what you enter is never sent to us.

Who writes it

Our articles and tools are written and edited by Alex Giles.

How we keep it accurate

Our recommendations are based on published guidance from sleep medicine bodies such as the American Academy of Sleep Medicine and the National Sleep Foundation, and on peer-reviewed research. Each tool lists its sources. The results are estimates meant to help you plan, not a diagnosis. Read our editorial standards.

How the site is funded

SleepTimeCalc is supported by our partner, Titan Recovery, which makes mouth tape and nasal strips to support nose breathing during sleep. Partner content is always labelled. It never changes how a calculator works or what result it gives you. Read our full disclosure.

Sister sites

For in-depth sleep reading, visit The Natural Sleep Lab and Snoring Help.