Caffeine Half-Life Calculator

Estimate remaining caffeine at bedtime and plan your intake better.

Results

Remaining caffeine:

Recommended cutoff:

About This Calculator

Uses typical half-life ranges to estimate remaining caffeine by bedtime, helping you fine-tune alertness and sleep quality.

FAQ

What half-life is assumed?

We assume 5–6 hours; results are estimates and vary by individual.

Does decaf count?

Yes, decaf contains small amounts; add it to intake.