Caffeine Calculator

Remaining caffeine by 5-hour half-life.

Input Parameters

Caffeine (mg)

Hours ago

Calculation Summary

Remaining (mg)131.9507911 mg

Remaining (%)65.97539554%

Half-lives0.60

175 available

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About this calculator

Remaining caffeine from dose and hours using a 5-hour half-life.

Half-life?

About 5 hours for most adults: dose × 0.5^(hours/5).

Coffee ≈ ?

Brewed cup ≈ 95 mg; espresso shot ≈ 65 mg.

Sleep cutoff?

Many sleep experts avoid caffeine 8+ hours before bed.