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Both calculators run independently β change the inputs on either side to compare results.
Power Nap Productivity Calculator
Estimates your post-nap productivity level (0β95 scale) based on current alertness, nap duration, and the time of day you plan to nap. Use it to decide whether a short nap is worth taking before an important task.
Post-Nap Alertness Level
75 %
65-84% is the target range for a 10-20 minute power nap, which studies link to a 34% improvement in performance. The example case (50% + 20-min nap) lands here at 75%.
This score is the formula's projected alertness on a 0-95% scale, capped at 95%; thresholds reflect that a 10-20 min power nap typically restores function without sleep inertia.
Caffeine Sleep Impact Calculator
Calculate how many milligrams of caffeine remain active in your system at bedtime based on when and how much you consumed, using a standard 5-hour half-life. Even moderate residual caffeine at bedtime measurably disrupts sleep architecture, not just sleep onset.
Key differences
| Power Nap Productivity Calculator | Caffeine Sleep Impact Calculator | |
|---|---|---|
| Category | Sleep | Sleep |
| Inputs required | 3 | 3 |
| Result | Post-Nap Alertness Level (%) | Caffeine Remaining at Bedtime (mg) |
| What it does | Estimates your post-nap productivity level (0β95 scale) based on current alertness, nap duration, and the time of day you plan to nap. Use it to decide whether a short nap is worth taking before an important task. | Calculate how many milligrams of caffeine remain active in your system at bedtime based on when and how much you consumed, using a standard 5-hour half-life. Even moderate residual caffeine at bedtime measurably disrupts sleep architecture, not just sleep onset. |