Caffeine Levels Calculator (Multiple Doses)

Enter multiple drinks and visualize your estimated caffeine curve. See estimated caffeine remaining at bedtime. Educational estimate — not medical advice.

Multiple doses Curve chart Bedtime remaining

Based on research showing caffeine can affect sleep even 6 hours before bed

If sleep is the priority, aim for an earlier cutoff and consider a longer half-life tier.

Sensitivity (half-life)

Choose “High” if you’re sensitive to caffeine.

Bedtime (optional)

Used to estimate remaining caffeine at bedtime.

Doses (time + mg)

Time	mg	Notes

Chart shows estimated caffeine remaining over time (mg). It’s an approximation.

FAQ

What should I enter for “mg”?

Use your best estimate. Brew method and cup size vary a lot. The curve is mainly for planning relative timing.

Does this account for food or sleep debt?

No. It’s a simple half-life model for educational planning.