MasterTool

Acceleration Calculator

Estimate quarter-mile ET, trap speed, eighth-mile ET and 0–60 time from vehicle weight and horsepower.

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What this tool does

Estimate quarter-mile ET, trap speed, eighth-mile ET and 0–60 time from vehicle weight and horsepower. ESTIMATES from empirical formulas fitted to drag-strip and road-test data — not simulations. Use crank horsepower and weight including driver and fuel.

How to use the Acceleration Calculator

  1. Enter or select vehicle weight with driver (lb).
  2. Enter or select horsepower (crank).
  3. Read the calculated result; change any measurement to compare alternatives.

Formula

Hale empirical: quarter ET ≈ 5.825 × (lb/hp)^⅓; trap MPH ≈ 234 × (hp/lb)^⅓; 0–60 estimate ≈ 0.86 × (lb/hp)^0.75 — all labelled estimates
weight
Vehicle weight with driver (lb)
hp
Horsepower (crank)

ESTIMATES from empirical formulas fitted to drag-strip and road-test data — not simulations. Use crank horsepower and weight including driver and fuel.

Worked example

For acceleration calculator, the following measurements illustrate the exact method: Vehicle weight with driver (lb): 3500; Horsepower (crank): 300.

Inputs

  • Vehicle weight with driver (lb)3500
  • Horsepower (crank)300

Result

  • Quarter-mile ET estimate (s)13.21
  • Quarter-mile trap speed estimate (mph)103.17
  • 0–60 mph estimate (s)5.43
  • Eighth-mile ET estimate (s)8.56
  • Weight per horsepower (lb/hp)11.67

Results explained

Quarter-mile ET estimate (s)
Quarter-mile ET estimate (s) from the formula above. ESTIMATES from empirical formulas fitted to drag-strip and road-test data — not simulations. Use crank horsepower and weight including driver and fuel.
Quarter-mile trap speed estimate (mph)
Quarter-mile trap speed estimate (mph) from the formula above. ESTIMATES from empirical formulas fitted to drag-strip and road-test data — not simulations. Use crank horsepower and weight including driver and fuel.
0–60 mph estimate (s)
0–60 mph estimate (s) from the formula above. ESTIMATES from empirical formulas fitted to drag-strip and road-test data — not simulations. Use crank horsepower and weight including driver and fuel.
Eighth-mile ET estimate (s)
Eighth-mile ET estimate (s) from the formula above. ESTIMATES from empirical formulas fitted to drag-strip and road-test data — not simulations. Use crank horsepower and weight including driver and fuel.
Weight per horsepower (lb/hp)
Weight per horsepower (lb/hp) from the formula above. ESTIMATES from empirical formulas fitted to drag-strip and road-test data — not simulations. Use crank horsepower and weight including driver and fuel.

Frequently asked questions

From Hale's widely published empirical relation: ET (s) ≈ 5.825 × (weight in lb ÷ horsepower)⅓. For 3,500 lb and 300 hp that gives about 13.2 s.

Hale's companion formula: trap MPH ≈ 234 × (horsepower ÷ weight)⅓ — about 103 mph for the same 3,500 lb / 300 hp example. Trap speed reflects power well because it is measured at the finish, after launch losses.

A rough empirical power-law fit to published road-test results, t ≈ 0.86 × (lb per hp)^0.75. It is labelled an estimate: gearing, traction, launch and drivetrain losses swing real results widely.

These formulas assume sea-level air, good traction, aggressive launch and crank horsepower actually reaching the wheels. Altitude, street tires, automatic gearing and wheelspin all add time.

Derived: eighth-mile ET is typically about 0.648 × quarter-mile ET for the same run, a ratio from aggregated drag-strip data — an approximation, not a measurement.