How to use the reaction time distance calculator
Find distance travelled during a reaction delay. Enter speed, reaction time in the fields above; the distance travelled is computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- v — Speed (km/h)
- t — Reaction time (s)
Worked example
With speed = 90 km/h, reaction time = 1.2 s, the calculator gives distance travelled ≈ 30 m.
Frequently asked questions
What is the formula for the reaction time distance calculation?
Distance travelled (m) = v / 3.6 × t. Here v is speed (km/h), t is reaction time (s).
What inputs do I need for the reaction time distance calculator?
You need speed in km/h, reaction time in s. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.