0-100 km/h Calculator
Estimate sprint time from power, weight and drivetrain using quarter-mile physics.
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What this tool does
This calculator estimates a vehicle's 0–100 km/h acceleration time using the Hales quarter-mile equation (5.825 × (lb/hp)^(1/3)), scaled to 100 km/h and adjusted for drivetrain type. Enter power (bhp), weight (kg) and drivetrain (FWD, RWD or AWD); the tool computes sprint time in seconds. The method assumes naturally-aspirated or turbo engines with consistent power delivery and typical tyre grip; heavily-modified or traction-limited vehicles may diverge from the estimate.
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Formula
How the 0–100 km/h Calculator works
The calculator takes three inputs—power in brake horsepower, kerb weight in kilograms and drivetrain configuration—and returns an estimated 0–100 km/h time in seconds. The underlying physics models quarter-mile elapsed time, scales that result to a 0–60 mph equivalent, then converts to 100 km/h (62.137 mph) with a multiplier that reflects drivetrain launch efficiency. All-wheel-drive vehicles apply a 0.95 factor (better traction off the line), rear-wheel-drive uses 1.0 and front-wheel-drive 1.02 to account for weight transfer and torque-steer losses.
The formula
The tool first converts weight to pounds (kg × 2.20462), then applies the Hales quarter-mile model:
t¼ = 5.825 × (lb ÷ hp)1/3
Then it scales the elapsed time directly to 0–100 km/h with a single empirical factor: t0–100 = t¼ × 0.62 × drivetrain_factor
A 0–60 mph figure is shown for context as t0–60 = t¼ × 0.58.
Where drivetrain_factor is 0.95 (AWD), 1.0 (RWD) or 1.02 (FWD).
Where this method is most accurate
The Hales equation fits naturally-aspirated and turbo engines with typical power curves and production tyres on dry asphalt. It performs best for power-to-weight ratios between 50 and 250 hp/tonne (family saloons through sports cars). Electric vehicles with instant torque, heavily-modified dragsters or cars with launch-control calibration may produce real-world times 10–20 per cent faster or slower than the estimate. Surface conditions, tyre compound, driver reaction time and gearbox tuning all introduce variance.
What this tool does not do
The calculator does not measure actual acceleration; it estimates only. It does not account for transmission type (manual, dual-clutch, CVT), launch-control systems, turbo lag, tyre temperature or altitude. It does not certify that any specific vehicle is safe to drive at high acceleration rates, nor does it replace manufacturer performance data. The result is an approximation for comparison and educational purposes.
Disclaimer
This tool is for educational and planning use only. It does not constitute vehicle-performance advice, safety certification or a guarantee of any particular acceleration time. Actual 0–100 km/h figures depend on road conditions, driver skill, tyre grip and many factors outside the model. Always observe speed limits and road regulations.
Questions
- Why do AWD times appear faster than RWD or FWD?
- All-wheel drive distributes torque across four contact patches, reducing wheel-slip during launch. The calculator applies a 0.95 multiplier to reflect this advantage; FWD receives a 1.02 penalty for weight transfer that unloads the driven axle.
- How does the Hales quarter-mile equation relate to 0–100 km/h?
- The Hales model predicts elapsed time over a standing quarter-mile. The tool scales that to 0–60 mph (approximately 60 per cent of quarter-mile time), then converts to 100 km/h (62.137 mph) using a ratio multiplier.
- Will the estimate match my car's official spec-sheet time?
- Manufacturer figures are typically recorded with professional drivers, optimal weather and sometimes launch-control active. The calculator provides a physics-based approximation; real-world variance of ±10–20 per cent is common.
- Does the tool account for turbo lag or hybrid boost?
- No. The formula assumes steady power delivery across the rev range. Turbocharged engines with significant lag or hybrid systems with electric-motor torque fill may behave differently than the estimate.
- Can I use this calculator for electric vehicles?
- The equation treats power and weight generically, so EVs can be entered. However, instant torque and single-speed transmissions often produce faster real-world times than the combustion-engine model predicts.
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Sources & Methodology
The calculator applies the Hales quarter-mile equation (5.825 × (lb/hp)^(1/3)), published in 1994 and widely adopted for drag-strip time prediction. It scales the quarter-mile elapsed time directly to a 0–100 km/h estimate using a single empirical scalar (×0.62) and applies a drivetrain multiplier (0.95 AWD, 1.0 RWD, 1.02 FWD) to reflect launch traction differences. A 0–60 mph figure (×0.58) is shown alongside for context.
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