Truck Payload Calculator

Screen truck payload, gross weight and front/rear axle margins from GVWR, GAWR, empty axle weights, cab load, cargo, trailer tongue load and load split.

Inputs

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GVWR (GVWR)

Gross vehicle weight rating from the manufacturer placard.

Front GAWR (F_GAWR)

Front gross axle weight rating.

Rear GAWR (R_GAWR)

Rear gross axle weight rating.

Empty front axle (F_empty)

Measured front axle weight before the added load. Use scale data when possible.

Empty rear axle (R_empty)

Measured rear axle weight before the added load. Use scale data when possible.

Cab / equipment load (W_cab)

Occupants, tools and equipment not already included in the empty axle weights.

Cargo load (W_cargo)

Payload carried in the bed, box or body.

Trailer tongue load (W_tongue)

Vertical hitch or trailer tongue load carried by the truck.

Cab load on rear axle

Estimated percent of cab/equipment load carried by the rear axle.

Cargo on rear axle

Estimated percent of cargo carried by the rear axle.

Tongue load on rear axle

Estimated percent of tongue load carried by the rear axle.

Results

Default result

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Gross vehicle weight(GVW)

4,445kg

Pass

Also computed

Payload used(W_payload)1,542kg

GVWR margin(M_GVWR)997.9kg

Front axle load(F_axle)1,903kg

Rear axle load(R_axle)2,542kg

Front axle margin(M_F)455.9kg

Rear axle margin(M_R)1,086kg

Method notes 3 notes

Axle load = empty axle weight + each added load multiplied by its entered front/rear split.
Additional cargo capacity uses the same cargo rear-axle split and is limited by GVWR, front GAWR and rear GAWR.
Use certified scale weights, tire/load ratings, hitch ratings, local regulations and manufacturer placards for real fleet or towing decisions.

Truck payload checks start with measured empty front and rear axle weights, then distribute cab load, cargo and tongue load between axles by the entered rear-bias percentages. This calculator returns gross vehicle weight, payload used, GVWR margin, front and rear GAWR margins, and how much more cargo can be added before the first rating limit is reached.

How to use this calculator

Enter ratings. Use the GVWR and front/rear GAWR from the vehicle placard.
Enter empty axle weights. Use scale weights for the unloaded truck if available.
Add payload items. Enter cab/equipment load, cargo load and any trailer tongue load.
Set load split. Estimate how much of each load is carried by the rear axle.
Review margins. Check GVWR, front axle and rear axle margins before adding more cargo.

How it works

The calculator starts from empty front and rear axle weights, then assigns each added load to the front and rear axle using the entered rear-axle percentage: front load = empty front + load x (1 - rear bias) rear load = empty rear + load x rear bias Gross vehicle weight is the sum of the two axle loads.

Use this with the fleet fuel cost calculator when route payload affects operating cost, or with the stopping distance calculator when loaded mass affects braking distance.

Worked example

Verified against the live calculator

With a 12,000 lb GVWR, 3,600 lb empty front axle, 2,800 lb empty rear axle, 400 lb cab load, 2,500 lb cargo and 500 lb tongue load, the default split gives 9,800 lb gross weight. The GVWR margin is 2,200 lb, with front and rear axle margins checked separately.

Frequently asked questions

What is payload capacity?

Payload capacity is the load a vehicle can carry while staying within GVWR and axle ratings. Occupants, tools, cargo and trailer tongue weight all consume payload.

What is the difference between GVWR and GAWR?

GVWR is the gross vehicle weight rating for the whole vehicle. GAWR is the front or rear axle rating. A truck can be under GVWR and still overload one axle.

Should I use curb weight or scale weights?

Use measured front and rear axle weights when possible. Published curb weight may not include upfits, tools, fuel level, accessories or fleet equipment.

Does trailer tongue weight count as payload?

Yes. Vertical hitch load is carried by the truck, so it counts against payload, GVWR, rear axle rating, tires and hitch limits.

Method & assumptions

Load split is a first-pass axle estimate. Real axle load depends on load position, wheelbase, hitch geometry and suspension layout.
Additional cargo capacity assumes new cargo has the same rear-axle split as the entered cargo load.
Legal fleet, towing and road-use decisions still need scale tickets, tire ratings, hitch ratings, manufacturer limits and local regulations.

Truck Payload Calculator

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