Sleep Calculator

Find your ideal bedtime or wake-up time based on 90-minute sleep cycles. Free sleep calculator so you wake up refreshed, not groggy.

schedule

Result

23.25

Breakdown

Sleep Minutes
450
Total Minutes In Bed
465

Frequently Asked Questions

Why 90-minute sleep cycles?▼
A full sleep cycle lasts about 90 minutes. Waking at the end of a cycle feels easier than mid-cycle, which is why this calculator works in 90-minute blocks.
How much sleep do adults need?▼
Most adults need 7-9 hours per night. This calculator targets 5-6 complete cycles (7.5-9 hours) by default.

Related Calculators

BMI Calculator

Calculate your Body Mass Index (BMI) instantly with metric or imperial units. Free BMI calculator with healthy weight range and category guidance.

Body Fat Calculator

Estimate your body fat percentage using the U.S. Navy circumference method. Free body fat calculator for men and women with fitness category guidance.

Calorie Calculator

Estimate your daily calorie needs using the Mifflin-St Jeor equation. Free calorie calculator for BMR, TDEE, and weight-loss or gain goals.

Due Date Calculator

Estimate your baby's due date and current pregnancy week using the first day of your last menstrual period. Free due date calculator.

BMI Calculator for Women

Calculate BMI tailored for women with healthy weight ranges. Free female BMI calculator.

BMI Calculator for Men

Calculate BMI tailored for men with healthy weight ranges. Free male BMI calculator.