Decision Fatigue Calculator
Every choice depletes a finite mental resource. Find your daily decision load score and get optimization strategies to protect your most important calls.
What is decision fatigue?
Every decision you make — from what to eat to whether to approve a contract — draws from the same finite mental resource. As you deplete it, decision quality declines: you default to the status quo, make impulsive choices, or avoid deciding at all. This is why judges are more lenient after lunch and CEOs make worse calls at 4pm than at 9am.
The Science of Decision Fatigue
In a landmark study of Israeli judges, researchers found that parole was granted to 65% of prisoners in the morning — and fell to nearly 0% by late afternoon before lunch or a break reset it. The same evidence, the same judges, wildly different outcomes — based purely on where in the day the decision fell.
Decision fatigue is real, well-documented, and deeply underappreciated. The key insight: you don't run out of intelligence — you run out of the willingness to decide carefully.
The Judge Study
Israeli judges showed a clear "decision fatigue" pattern: favorable rulings peaked after breaks and declined linearly across each decision session, regardless of case quality.
Willpower = Glucose
Research suggests ego depletion is partly metabolic. Decision-making consumes glucose — which is why food/rest resets decision quality. It's why "sleep on it" genuinely works.
Status Quo Bias
When fatigued, people default to "no change" or "safe choice." CEOs, doctors, and executives all show this pattern. The safe choice isn't always right — just easiest.
Restoration
Decision quality restores after breaks, food, sleep, and by eliminating trivial decisions. This is why Obama wore the same suits daily — protecting cognitive resources for important choices.