Blue Light Cutoff Calculator
Enter your bedtime and how many minutes before bed to stop using screens.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
The blue wavelengths emitted by phone, tablet, and computer screens are especially effective at suppressing the body's production of melatonin, the hormone that signals it's time to sleep, which is why late-night screen use is consistently linked to trouble falling asleep and lower sleep quality.
Sleep hygiene guidelines commonly recommend stopping screen use somewhere between 30 minutes to 2 hours before bed to let melatonin levels rise naturally. This calculator simply subtracts your chosen lead time from your bedtime to give you a concrete screens-off time to build into your nightly routine.
Was this helpful?
Popular calculators
Loan Calculator
Monthly payment, total interest and full amortization schedule.
Percentage Calculator
Percent change, percent of, and ratio calculations.
Discount Calculator
Calculate final price, savings, and discount amount.
BMI Calculator
Body mass index from height and weight (metric or imperial).
Age Calculator
Compute your exact age in years, months and days from a birth date.
Compound Interest Calculator
Calculate the final amount and interest earned with compounding.
All Calculators
No calculators found
Comments (0)