Vehicle Load Distribution
Front and rear axle weights with GVWR / GAWR flags.
Example
You enter
- Wheelbase (in) 140
- Payload (lb) 1000
- Payload center behind the front axle (in) 60
- GVWR (lb, optional) 8800
- Front GAWR (lb, optional) 4400
- Rear GAWR (lb, optional) 5500
- Curb front axle (lb) 2500
- Curb rear axle (lb) 2300
You get
- Front axle total 3,071 lb
- Rear axle total 2,729 lb
- Gross weight 5,800 lb
Checked against published worked examples from: TruckScience.
Details, formula, and sources
Formula or tableRear axle share = payload × (distance of the payload center behind the front axle) / wheelbase; Front share = payload − Rear share; each added to the curb axle weight. Compared against user-supplied GVWR and per-axle GAWR labels.
Source and editionFMVSS 49 CFR 567.4 (vehicle certification labels) by section.
Free accessFree at ecfr.gov.
What governsEstimate. AHJ and licensed professional govern.
API field nameswheelbase_in, payload_lb, payload_position_from_cab_in, gvwr_lb, front_gawr_lb, rear_gawr_lb, curb_front_lb, curb_rear_lb, front_axle_lb, rear_axle_lb, gross_lb
- GVWR / GAWR source vehicle door-jamb sticker (legal record)49 CFR 567.4