Human Reaction Time Calculator
Enter your measured reaction time and see how it compares to average human response times, athlete benchmarks, and real-world scenarios like driving.
Average Human Reaction Time The average visual reaction time is 200-250 milliseconds (0.20-0.25 seconds). Auditory reaction time is slightly faster at 150-200 ms. Touch-based reaction is fastest at 130-180 ms.
Factors That Affect Reaction Time Age: peaks in the mid-20s and slows gradually after 30. Fatigue: tiredness adds 50-100ms. Caffeine: reduces by 10-30ms. Alcohol: increases by 100-300ms depending on BAC. Practice: trained athletes and gamers often react in 160-190ms.
Driving Implications At 60 mph (88 ft/sec), each 100ms of reaction time means about 8.8 feet of travel before braking begins. At 250ms average reaction time, you travel 22 feet before your foot touches the brake — before any deceleration. Total stopping distance includes reaction distance plus braking distance.
Sports Benchmarks MLB hitters must react to a 90+ mph pitch in under 400ms — including swing time. Top sprinters leave the starting block in 100-130ms. Formula 1 drivers average 200-220ms. Video game pros average 150-180ms.