Reaction Time Calculator
Free calculate reaction distance, braking distance, and total stopping distance based on speed and reaction time.
Input Parameters
seconds
Typical: 1.5-2.5 seconds
m/s²
Dry road: ~7 m/s², Wet: ~5 m/s², Icy: ~2 m/s²
Results
Enter speed and reaction time to calculate
Stopping Distance Formulas
Reaction Distance
d_reaction = Speed × Reaction Time
Distance traveled before braking begins
Braking Distance
d_braking = v² / (2 × a)
Distance traveled while braking
Total Stopping Distance
d_total = d_reaction + d_braking
Sum of reaction and braking distances
Deceleration Rates
- • Dry pavement: ~7 m/s²
- • Wet road: ~5 m/s²
- • Icy road: ~2 m/s²