How the calculation works
One hundred kilometres per hour is 27.78 metres per second. Average acceleration is the change in velocity divided by elapsed time. For a 4.0-second run, that is 27.78 ÷ 4.0, or 6.94 m/s². Dividing by standard gravity gives an average of 0.71 g.
The distance result assumes the car accelerates at one constant rate from rest. Real cars do not: tyre grip, gearing, torque, aerodynamic drag and power delivery change throughout the run. Treat it as a physics illustration, not a measured braking marker or road-test result.
Why the 0–60 mph number is only an estimate
Sixty miles per hour is 96.56 km/h. The calculator scales the submitted time by that speed ratio and assumes constant acceleration. A real vehicle may change gear, reduce power or gain traction near the end of the sprint, so an instrumented 0–60 mph test can differ.
For a like-for-like comparison of published acceleration times, read the 0–100 times guide before treating an estimated 0–60 result as a measured test.
Use performance figures safely
Acceleration testing belongs on a closed course with suitable supervision, surface, tyres and safety equipment. Do not attempt a timed launch on a public road. To compare published results, also check the exact variant, test direction, rollout method, battery state or fuel, temperature and evidence source.
Time to 100’s performance glossary explains those terms, and the data methodology describes how evidence is labelled in the index.