Caffevolve™ · The Science

Caffeine & Sleep Window
Calculator

Caffeine has a half-life of 5–7 hours. See exactly when to cut off — and at what blend — so your afternoon cup doesn't cost you your night.

Your Schedule & Habits

Wake TimeWhen you typically start your day

6:30

4:00 AM11:00 AM

Target BedtimeWhen you want to fall asleep

10:30

8:00 PM2:00 AM

Afternoon Brew TimeWhen will you enjoy your afternoon cup?

2:00

12:00 PM7:00 PM

Caffeine SensitivityHow caffeine affects your sleep

Your Caffeine Window Today

Free Zone — any blend Caution Zone — reduce blend % Sleep Window

Free Zone

Caution

6:30 AM

Wake Up

2:00 PM

Your Brew

—

Last Call

10:30 PM

Bedtime

Recommended blend for your afternoon cup:

—

Your Afternoon Brew Recommendation

Recommended Blend

—

caffeine content

Residual at Bedtime

—

caffeine remaining in system

Safe Cutoff Time

—

for a full-caffeine brew

Caffevolve™ Insight

Adjust your schedule above to see your personalized recommendation.