Performance and Drivetrain
Rolling Resistance Calculator
Estimate rolling resistance force and power from vehicle weight and a coefficient. Coefficient changes with tire, pressure, speed, temperature, alignment, and surface.
Enter compatible measurements
Enter current information for Rolling Resistance and leave unrelated adjustments outside the form.
Start with the operating case
Estimate rolling resistance force and power from vehicle weight and a coefficient — the model isolates a performance relationship under stated assumptions.
Coefficient changes with tire, pressure, speed, temperature, alignment, and surface — that condition defines when rolling resistance force is comparable with another result.
The mathematical relationship
In “rolling force = vehicle weight force × rolling-resistance coefficient,” the printed units define how each term is interpreted.
No term beyond vehicle weight, rolling resistance coefficient, and vehicle speed is introduced in “rolling force = vehicle weight force × rolling-resistance coefficient.”
Building one consistent data set
Vehicle weight. Loaded vehicle weight — for this measurement, use the same loaded condition for every weight and retain the scale ticket or rating source.
Document Rolling resistance coefficient as entered tire and surface coefficient — this means you should use a measurement or specification from the exact component and operating condition being evaluated.
For Vehicle speed, use the quantity described as steady road speed — in the vehicle record, use a stable operating point and document any tire, gearing, grade, or wind condition that affects it.
Loaded values as a demonstration
The numbers currently shown in the form are Vehicle weight = 3,800 lb, Rolling resistance coefficient = 0.011, and Vehicle speed = 60 mph.
The output panel should show Rolling resistance force = 186 N, Power against rolling resistance = 4.99 kW, and Rolling resistance force = 41.8 lbf.
Meaning of the calculated value
Rolling resistance force answers “Estimate rolling resistance force and power from vehicle weight and a coefficient.” The additional displays, Power against rolling resistance and Rolling resistance force, are a different view of the same entered measurements.
Grades and aerodynamic drag are separate — when that condition changes, compare separate calculator runs instead of blending the inputs.
Because coefficient changes with tire, pressure, speed, temperature, alignment, and surface, a disagreement between rolling resistance force and an outside reference should trigger a review of vehicle weight and vehicle speed.
A related vehicle record may need to calculate total low-speed drivetrain reduction, a relationship covered by the Crawl Ratio.
What remains a separate check
Traction, grade, wind, temperature, driver input, and control-system intervention remain outside this simplified model — for vehicle weight, the page specifically expects loaded vehicle weight.
If the next task is to calculate road speed from engine RPM and overall gearing, continue with the Road Speed at Engine RPM.
Interpreting this calculator
What measurement source fits Vehicle weight when it represents loaded vehicle weight?
Because vehicle weight represents loaded vehicle weight, use a source tied to the exact vehicle, component, and operating period described by the other fields.
How does the warning “Coefficient changes with tire, pressure, speed, temperature, alignment, and surface” affect Rolling resistance force?
The condition “Coefficient changes with tire, pressure, speed, temperature, alignment, and surface” is not corrected automatically by the numeric inputs, so create a separate rolling resistance case when it changes.
What assumption is expressed by “rolling force = vehicle weight force × rolling-resistance coefficient”?
In “rolling force = vehicle weight force × rolling-resistance coefficient,” vehicle weight and rolling resistance coefficient are treated as parts of one vehicle case.
How narrowly is Rolling resistance coefficient defined by “Entered tire and surface coefficient”?
The definition “Entered tire and surface coefficient” excludes a similarly named rating or a measurement taken at another reference point.