0-60 Calculator
This 0-60 calculator estimates how quickly a car accelerates from a standstill to 60 mph and to 100 km/h, using its engine power, its weight and a real-world factor that reflects how much of the rated power actually reaches the road during a full-throttle run. Enter the kerb weight from your car's specifications, add the weight of the driver and any load, enter the engine's peak power in kilowatts, and leave the real-world factor at 50% unless you have a reason to change it. The calculator applies the energy method: it works out the kinetic energy the car needs at the target speed and divides it by the average usable power, giving an estimated time for both benchmarks along with the power-to-weight ratio and the average acceleration over the run. The real-world factor is the honest part of the model, because no car delivers its full rated power for the whole run: drivetrain losses, gear changes, launch traction and the shape of the power curve all take their share. Petrol and diesel cars typically land near 50%, while quick EVs with instant torque and no gear changes deliver more, so nudge the factor to 60 or 70% for those. Use it to compare cars, sanity-check claims, or see what a power upgrade might really do.
1 kW is about 1.34 hp, so a 150 kW engine is roughly 201 hp. The real-world factor covers drivetrain losses, gearing, launch and the power curve: about 50% suits most petrol and diesel cars, 60 to 70% suits quick EVs.
An estimated 7.6 s to 60 mph is brisk by everyday standards: quicker than most family cars on NZ roads.
Estimate only: the model ignores aerodynamic drag, traction limits, turbo lag and gear-change time, so treat the result as a ballpark rather than a stopwatch figure.
How it works
The calculator uses the energy method. A car of mass m travelling at speed v carries kinetic energy of half m times v squared, and the time to reach that speed is roughly that energy divided by the average power delivered to the road: t = (m x v²) / (2 x P x f), where P is peak engine power and f is the real-world factor. The factor exists because a full-throttle run never uses peak power the whole way: some power is lost through the gearbox and driveline, the engine spends much of each gear below its peak-power revs, gear changes interrupt the drive entirely, and off the line the tyres limit how much power you can use at all. Setting f near 50% reproduces published times for typical petrol and diesel cars remarkably well, while EVs with single-speed drivetrains and instant torque justify 60 to 70%. The power-to-weight figure uses kerb weight in tonnes, which is the convention used in road tests, and average acceleration is simply the target speed divided by the estimated time.
Worked example
Take a 1,500 kg car with a 75 kg driver, 150 kW and the factor at 50%. Total mass is 1,575 kg. Sixty mph is 26.82 m/s, so the kinetic energy needed is 0.5 x 1,575 x 26.82², about 567 kJ. Average usable power is 50% of 150 kW, which is 75 kW, and 566,560 J divided by 75,000 W gives about 7.55 seconds, shown as 7.6 s. For 0-100 km/h the speed is 27.78 m/s, the energy is about 608 kJ, and the estimate becomes 8.1 s. Power to weight is 150 kW over 1.5 tonnes, exactly 100.0 kW/tonne, which is right in line with the brisk verdict.
Related calculators
- Power to Weight Ratio Calculator: kW per tonne in detail.
- Acceleration Calculator: acceleration from speed and time.
- Horsepower Calculator: convert between kW and hp.
- Torque to Horsepower Calculator: torque, revs and power.
- Fuel Cost Calculator: what the driving actually costs.
Frequently asked questions
How do you estimate a 0-60 time from power and weight?
The energy method divides the kinetic energy the car needs at the target speed by the average power actually delivered to the road: time = (mass x speed squared) / (2 x power x real-world factor). The factor accounts for drivetrain losses, gear changes, launch traction and the fact that an engine only makes peak power near the top of its rev range. Around 50% is realistic for most petrol and diesel cars, while quick EVs with launch control can deliver 60% or more of their rated power on average.
What is a good 0-60 mph time?
Under 4 seconds is supercar and performance EV territory. Around 4 to 6 seconds covers genuine sports cars and the quickest hot hatches, 6 to 8 seconds is brisk by everyday standards, 8 to 11 seconds is typical for family cars and SUVs, and over 11 seconds is leisurely, which is where many small city cars and loaded vans sit. For reference, 60 mph is 96.6 km/h, so a car's 0-100 km/h time is slightly longer than its 0-60 mph time.
Why is my car's real 0-60 time different from the estimate?
The simple energy model ignores several real-world effects: wheelspin off the line, the time lost to gear changes, turbo lag, aerodynamic drag at higher speed, road surface and weather, and how far the engine sits from its peak-power revs in each gear. All-wheel-drive cars launch harder than rear or front-wheel-drive cars with the same outputs. If you know your car's tested time, tune the real-world factor until the estimate matches, then use that factor to compare modifications or other vehicles.
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