Free sleep tools · no signup
Sleep Calculator Hub
Start here when you need a bedtime calculator or wake-up calculator. The main WorkItOut.Tools sleep calculator is live, the Power Nap Calculator is open for review, and the rest of the sleep tools stay hidden until checked.
- live tools
- 2
- methods inside
- 3
- unchecked tools shown
- 0
- free, no signup
- 100%
Start here
Calculator for the viral sleep cycle method
Use the viral 90-minute sleep-cycle method to find a bedtime or wake-up time, then compare it with duration and flexible-window results.
Sleep by the numbers
The three numbers behind every result
Duration targets, average cycle length, and the time it takes to fall asleep - every method on this site is built from these.
Tools
Sleep tools you can use now
The main sleep calculator and Power Nap Calculator are visible while we finish review on the rest of the sleep tool suite.
Which page should you open first?
I know when I need to wake up.
Open the main sleep calculator, enter your wake-up time, and compare duration, cycles, and flexible-window results.
I want a bedtime or wake-up answer.
Use the same calculator. Switch between bedtime mode and wake-up mode inside the tool.
A note on sleep estimates
Sleep calculators are planning aids, not prescriptions. WorkItOut.Tools shows the method behind each result because real sleep is shaped by duration, timing, quality, consistency, and individual need.
If sleep is consistently difficult, unsafe, or unrefreshing, use the calculators as a planning reference and talk with a qualified clinician for personal advice.