NCP

Automotive

New Car Performance Calculator

Combine loaded mass with rated power and torque, then separate aerodynamic and rolling resistance at one entered road speed.

Modeled loaded mass (kg)-
Power-to-weight ratio (kW per tonne)-
Torque-to-weight ratio (N m per tonne)-
Road-speed reference (m/s)-
Aerodynamic drag force reference (N)-
Rolling resistance force reference (N)-
Road-load power reference (kW)-
Rated power minus road-load reference (kW)-

Decision view

Loaded vehicle road-force balance

Loaded vehicle road-force balanceLoaded mass, power-to-weight, aerodynamic force, rolling force, and steady-speed road load remain distinct.
Exact scenario comparisonRoad-speed reference (km/h) changes while all other entered assumptions remain constant.
Road-speed reference (km/h)Modeled loaded mass (kg)Power-to-weight ratio (kW per tonne)Torque-to-weight ratio (N m per tonne)Road-speed reference (m/s)Aerodynamic drag force reference (N)Rolling resistance force reference (N)Road-load power reference (kW)Rated power minus road-load reference (kW)

How to use New Car Performance Calculator

  1. Use realistic operating payload.
  2. Enter representative aerodynamic data.
  3. Compare road-load reference with usable wheel power, not only rated power.

Calculator guide

Understanding New Car Performance Calculator

Power-to-weight describes one vehicle relationship while steady-speed road load describes another; neither alone predicts acceleration.

Load the vehicle Payload changes ratios and rolling demand.
Speed dominates aero Highway speed sharply raises drag.
Rated is not wheel Drivetrain availability is excluded.
No acceleration claim Road load is a steady-speed reference.

Calculation method

How the calculation works

Combine loaded mass with rated power and torque, then calculate transparent aerodynamic and rolling road-load references at one selected steady speed. Add payload to curb mass, normalize power and torque per tonne, calculate aerodynamic force from speed squared, rolling force from loaded weight, and road-load power from total force times speed.

Vehicle interpretation

Read the forces at the selected speed

The visualization separates what the vehicle must overcome from the rating on the specification sheet.

Rolling Mostly proportional to loaded mass.
Aerodynamic Strongly dependent on road speed.
Road-load power Power needed for the two modeled forces.
Reserve Rated power less the simplified road load.

Worked situations

Practical examples

  • Aerodynamic force grows with speed squared.
  • Road-load power grows even faster because force is multiplied by speed.
  • Payload affects power-to-weight and rolling resistance.

Better inputs

Useful tips

  • Test highway speeds separately.
  • Use wheel-power data where available.
  • Add grade and wind in a fuller model.

Before relying on the result

Limitations and common mistakes

  • Gearing, drivetrain loss, battery limits, grade, wind, tires, traction, acceleration, temperature, and certification procedures are excluded.
  • Rated power may not be available at the selected speed.
  • This is not a performance test.

Reference

Key terms

Power-to-weight
Rated power divided by loaded mass in tonnes.
Aerodynamic force
Drag reference based on air density, area, coefficient, and speed squared.
Rolling force
Coefficient multiplied by loaded weight.
Road-load power
Aerodynamic plus rolling force multiplied by speed.

Important note

Calculated from the entered vehicle and operating values. Actual prices, financing terms, efficiency, maintenance, insurance, taxes, and resale outcomes can differ.

Frequently asked questions

Does power reserve predict acceleration?

No.

Why include payload?

It changes loaded mass and rolling resistance.

Does drag include wind?

No.

Is motor efficiency included?

No.