Sleep Age Calculator — How Old Does Your Body Feel?

How old does your body really feel?

Your chronological age is just a number. But your Sleep Age is a reflection of your lifestyle, your recovery, and your accumulated sleep debt. When you consistently miss out on deep, restorative sleep, your cognitive function, metabolism, and energy levels begin to mimic someone much older.

Our sleep age calculator analyzes key indicators of fatigue—from how you feel when your alarm goes off to your reliance on caffeine—to estimate your total sleep debt and calculate your true physiological Sleep Age.

The good news? Unlike your real age, you can reverse your Sleep Age. Start by finding your perfect bedtime with our sleep cycle calculator to pay back your sleep debt tonight.

Frequently asked questions

What is Sleep Age? +

Sleep Age is a conceptual metric that illustrates how much older your body and mind feel due to accumulated sleep debt. It compares your physiological fatigue to your chronological age.

How do you calculate sleep debt? +

Sleep debt is the difference between the amount of sleep you need (typically 7-9 hours) and the amount you actually get. Our calculator uses lifestyle and feeling markers to estimate your total debt.

Can you reverse your Sleep Age? +

Yes! Sleep debt can be repaid. By consistently going to bed at optimal times aligned with your 90-minute sleep cycles, you can clear your debt and lower your Sleep Age.