Compare calculators
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
Estimate how much caffeine remains active in your body at bedtime based on when you last consumed it and your personal sensitivity. Use it to decide your caffeine cutoff time so it doesn't wreck your sleep.
Key differences
| Power Nap Productivity Calculator | Caffeine Sleep Impact Calculator | |
|---|---|---|
| Category | Sleep | Sleep |
| Inputs required | 3 | 4 |
| Result | Post-Nap Alertness Level (%) | Caffeine in System 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. | Estimate how much caffeine remains active in your body at bedtime based on when you last consumed it and your personal sensitivity. Use it to decide your caffeine cutoff time so it doesn't wreck your sleep. |