About GetSleepCalculator.net
We build free, science-based sleep tools to help people understand their sleep and wake up feeling genuinely refreshed — not just "rested enough."
Our Mission
Sleep is the single most important factor in physical health, cognitive performance, and emotional wellbeing — yet most people have never been taught the basic science of how sleep works.
GetSleepCalculator.net exists to close that gap. Every tool on this site is built on peer-reviewed research from the National Sleep Foundation (NSF), the American Academy of Sleep Medicine (AASM), and leading sleep researchers including Matthew Walker and Dr. Russell Foster.
Our tools are 100% free, require no signup, and process all calculations locally in your browser — your data never leaves your device.
90 min
The science behind every tool
All our calculators are built around the 90-minute sleep cycle — the fundamental unit of human sleep architecture, consistent across all research since Nathaniel Kleitman's 1953 discovery of REM sleep.
How Our Tools Work
Science-Based
Every recommendation is grounded in peer-reviewed sleep research. We cite our sources and update content when new findings emerge.
Privacy First
All calculations happen in your browser. We don't store, sell, or process any personal data. What you enter stays on your device.
Accuracy
Our calculators use the 90-minute cycle standard + 14-minute sleep onset average, consistent with NSF and AASM guidelines.
Our Tools
Bedtime Calculator
Find the perfect bedtime from your wake-up time
Wake-Up Calculator
Find the best wake-up time from your bedtime
Nap Calculator
Power nap and full-cycle nap timing
Sleep Debt Calculator
Track your weekly accumulated sleep debt
Sleep Cycle Calculator
Visualize your full sleep architecture
Chronotype Calculator
Discover if you are a Lion, Bear, Wolf, or Dolphin