Energy Bank
An estimate of how much energy you have left today, 0 to 100%.
- Red0-33%
- Yellow34-66%
- Green67-100%
Past your target
You are past today’s target. Prioritise sleep tonight to recover.
A steady day
Your HRV is below your baseline, which held Recovery back today.
Last night’s sleep
Your sleep was sufficient. You slept 92 minutes less than you needed; an earlier night helps.
What goes in
- Recovery and Sleep Performance
- Set the starting level when you wake.
- Heart-rate load
- Each minute’s heart-rate points, as in Strain.
- Stress
- High-stress minutes drain; calm, still minutes recharge.
- Naps
- Recharge.
How it is weighted
At wake you start at 60% of Recovery plus 40% of Sleep Performance: Recovery 70% and sleep 80% start you at 74%. Then, minute by minute until bedtime:
- Awake
- −0.04 a minute, about 38 over 16 hours.
- Heart-rate load
- −0.08 a minute for each heart-rate point, 1 to 5. An hour at 70-79% of your reserve costs 14.4.
- High stress
- −0.08 a minute.
- Low stress, still
- +0.01 a minute.
- Napping
- +0.25 a minute, with no drain.
What the bands mean
- 67-100%
- Plenty in reserve.
- 34-66%
- Pace yourself.
- 0-33%
- Running low.
The level stays between 0 and 100%. The three biggest drains are listed by name.
Limits
Energy Bank needs today’s Recovery and last night’s main sleep; without them it shows no value, and it is Provisional while Recovery is. It is a model with tuned constants and no published validation, set so a typical day ends between 15% and 40%. It cannot see mental effort that leaves heart rate unchanged, food or caffeine. It is an estimate, not a measurement.
Sources
The full specification, with formulas, constants and worked examples, is energy-bank.md on GitHub. The code is tested against those examples.