Stopping Distance Calculator

Calculate the total distance required to stop a vehicle, including reaction time and braking.

Input Parameters

Initial Speed (v)

Unit

undefined (s)

Coefficient of Friction (μ)

Calculation Results

Enter parameters to calculate

About this calculator

Quick Reference

vInitial velocity

tReaction time

μFriction coefficient

g9.81 m/s²

Overview

A vehicle's stopping distance is the sum of the distance traveled during the driver's reaction time and the distance traveled while braking.

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Pro Tips

Total distance = v * t + v² / (2 * μ * g).
Average reaction time is about 1.5 seconds, but it varies by person and conditions.
μ for dry asphalt is around 0.7, while wet roads can be 0.4 or lower.

Fun Facts

"If you double your speed, your braking distance actually quadruples because it depends on the square of the velocity!"
"Modern ABS systems help maintain the maximum possible friction (μ) during an emergency stop."
"Distracted driving can triple your reaction time, making the stopping distance much longer than expected."

Formula: d = vt + v² / (2μg)