100% free No signup Works offline
Age down to the day. Sleep down to the minute.
Two fast, private calculators that run entirely in your browser. Get your exact age in years, months and days — or the best bedtime and wake-up times based on 90-minute sleep cycles.
[ THE TOOLS ]
Two tools. Zero fuss.
Age Calculator
Your exact age in years, months and days — plus total days, weeks and months, your day of birth, and a countdown to your next birthday.
Calculate your age →Sleep Calculator
The best bedtime for your wake-up time — or the best wake-up times for your bedtime — built on 90-minute sleep cycles and your own sleep latency.
Plan your sleep →Guides & Blog
Ten plain-language guides on exact-age math, leap years, sleep cycles, sleep latency and how much sleep people really need.
Read the guides →[ HOW IT WORKS ]
Three steps. Nothing stored.
1. Open a tool
Age Calculator or Sleep Calculator — both work on any phone, tablet or computer.
2. Enter your details
Your date of birth, or the time you want to wake up. That's it.
3. Get instant results
Calculated locally, in milliseconds. Copy, share or print — nothing is saved or uploaded.
[ NO ACCOUNT. NO LIMITS. ]
Your data. Your device.
Everything runs locally in your browser. There is no server to upload to, no profile to build, and nothing to track.
- 100% client-side processing
- No files or dates uploaded anywhere
- No accounts, ever
- Works offline, once loaded
[ FROM THE BLOG ]
Latest guides
How to calculate your exact age
Years, months, days — and the common mistakes people make doing it by hand.
Read guide →Sleep cycles explained: why 90 minutes matters
What happens inside a sleep cycle, and why waking at the right moment feels better.
Read guide →How much sleep do adults need?
The seven-to-nine-hour guideline, why needs vary, and the signs you're getting enough.
Read guide →