Free Reaction Time Estimator
Estimate how your reaction time is affected by sleep, caffeine, age, and fatigue compared to a baseline.
years
hours
mg
One coffee ~ 100 mg
hours
Estimated Reaction Time
203 ms
Age-Based Baseline208 ms
Total Adjustment-5 ms
Estimated Reaction Time vs Age
Reaction Time Estimation
Average visual reaction time is about 200-250 ms for young adults.
Factors Affecting Reaction Time
Practical Impact
At 60 mph, each 100 ms adds about 8.8 feet of stopping distance.
Example Calculation
A 30-year-old, 7 hours sleep, 100 mg caffeine, 8 hours awake.
- 01Base RT = 200 + (30 - 25) x 1.5 = 207.5 ms
- 02Sleep penalty = 0 (7 hours is adequate)
- 03Caffeine benefit = 100 x 0.05 = -5 ms
- 04Fatigue = 0 (8 < 14)
- 05Total = 207.5 - 5 = 203 ms
Frequently Asked Questions
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