Stopping Distance Calculator (Based on Speed)
Estimates use the reference table (dry, level pavement).
Stopping distance = Reaction distance + Braking distance
Values are interpolated between reference speeds.
View reference table used
| Speed | Reaction | Braking | Stopping |
|---|---|---|---|
| 32 | 6 | 6 | 12 |
| 48 | 9 | 14 | 23 |
| 50 | 11 | 14 | 25 |
| 64 | 12 | 24 | 36 |
| 80 | 15 | 38 | 53 |
| 96 | 18 | 55 | 73 |
| 112 | 21 | 75 | 96 |
Intermediate values use linear interpolation.
User Manual
Stopping Distance Calculator (Based on Speed)
Purpose of the Tool
The Stopping Distance Calculator helps users understand how much distance a vehicle needs to come to a complete stop at different speeds.
It calculates:
Reaction distance – distance travelled while the driver reacts
Braking distance – distance travelled while braking
Stopping distance – total distance required to stop the vehicle
Formula used:
Stopping distance = Reaction distance + Braking distance
How to Use the Calculator
Enter Vehicle Speed
Enter the vehicle speed in kilometres per hour (km/h).
You can:
Type the speed directly in the input box
Use the slider below the input field
Supported range: 0 to 130 km/h
View Calculated Distances
As soon as you change the speed, the calculator automatically updates:
Reaction Distance (m)
Distance the vehicle travels during the driver’s reaction time.
Braking Distance (m)
Distance the vehicle travels while the brakes are applied.
Stopping Distance (m)
Total distance required to stop the vehicle completely.
All values are shown in metres (m).
Reference Data Used
The calculator is based on standard reference values for a dry, level road surface, including the following speeds:
32 km/h
48 km/h
50 km/h
64 km/h
80 km/h
96 km/h
112 km/h
For speeds between these values, the calculator uses linear interpolation to estimate distances.
You can view the full reference table by clicking:
“View reference table used”
Understanding the Result Note
Below the result cards, a note explains how the value was calculated:
Exact match
The entered speed exactly matches a reference table value.
Interpolated value
The entered speed lies between two reference speeds.
Approximation notice
If the speed is below or above the table range, the nearest reference value is used.
Important Assumptions
This tool assumes:
Normal, attentive driver reaction
Dry and level road surface
Properly maintained brakes and tyres
Average vehicle weight and tyre pressure
Actual stopping distances may vary due to:
Wet or slippery roads
Driver fatigue or distraction
Vehicle condition
Road gradient
Educational Use
This calculator is intended for:
Road safety education
Learner driver awareness
General understanding of vehicle stopping distances
It should not be used as a replacement for real-world driving judgment.
...
Enter speed
Instantly see reaction, braking, and stopping distances
Clean, visual, and easy to understand
Designed for clarity and safety awareness
