Nap Calculator
Use this nap calculator to choose a power nap, short nap, or full-cycle nap and estimate when you should wake up.
Calculate Your Nap Wake-Up Time
Enter when your nap starts and choose your nap length.
What is the best nap length?
A 10 to 20-minute nap is often used as a quick power nap. A 90-minute nap may allow a fuller sleep cycle. Avoid long or late naps if they make it harder to fall asleep at night.
10–20 minutes
A short power nap may help alertness while reducing the chance of waking up groggy.
30–60 minutes
A longer nap may feel restorative, but some people wake up groggy if they enter deeper sleep.
90 minutes
A 90-minute nap may allow a fuller sleep cycle, but it requires more available time.
How to Use the Nap Calculator
Choose your nap start time
Enter the time you plan to lie down for your nap.
Add time to fall asleep
Most people do not fall asleep immediately, so include 5 to 20 minutes of sleep onset time.
Choose nap length
Select a 10, 20, 30, 60, or 90-minute nap depending on your available time and goal.
Wake up on time
Use the suggested wake-up time to avoid accidentally napping longer than planned.
Nap Calculator FAQ
What is the best nap length?
A short nap of about 10 to 20 minutes is often used for a quick energy reset. A 90-minute nap may allow a fuller sleep cycle.
What is a power nap?
A power nap is a short nap, usually around 10 to 20 minutes, intended to improve alertness without spending too much time asleep.
Is a 30-minute nap too long?
A 30-minute nap may be helpful for some people, but others may wake up groggy if they enter deeper sleep and wake during it.
Is a 90-minute nap better?
A 90-minute nap may allow a fuller sleep cycle, but it is not always practical and may affect nighttime sleep if taken too late.
When should I avoid napping?
You may want to avoid late-day naps if they make it difficult to fall asleep at night. People with persistent sleep problems should seek professional guidance.
Is this nap calculator medical advice?
No. This calculator is for general nap planning and is not medical advice.