Truck Load Capacity Calculator

Calculator Inputs

Enter truck, axle, and cargo details. The calculator compares weight, space, floor loading, and axle distribution before recommending a safe load quantity.

Truck Dimensions and Capacity

Truck Length (m)

Truck Width (m)

Truck Height (m)

Maximum Gross Weight (kg)

Truck Tare Weight (kg)

Route Payload Cap (kg)

Use 0 to ignore this limit.

Fill Efficiency (%)

Safety Margin (%)

Floor Loading Limit (kg/m²)

Use 0 to ignore this limit.

Axle Limits and Empty Axle Loads

Front Axle Limit (kg)

Drive Axle Limit (kg)

Trailer Axle Limit (kg)

Empty Front Axle Load (kg)

Empty Drive Axle Load (kg)

Empty Trailer Axle Load (kg)

Estimated Cargo Weight Distribution

Front Share (%)

Drive Share (%)

Trailer Share (%)

Cargo Unit Details

Unit Length (m)

Unit Width (m)

Unit Height (m)

Unit Weight (kg)

Requested Units

Maximum Stack Layers

Example Data Table

Scenario	Truck Size (m)	Max Gross (kg)	Tare (kg)	Unit Size (m)	Unit Weight (kg)	Requested Units
Standard palletized goods	13.60 × 2.45 × 2.70	40,000	14,500	1.20 × 1.00 × 1.10	800	20
Light consumer cartons	12.00 × 2.40 × 2.50	26,000	8,500	0.80 × 0.60 × 0.70	140	120
Dense industrial components	13.60 × 2.45 × 2.70	44,000	16,000	1.20 × 1.00 × 1.20	1,150	22

Formula Used

Truck volume
Truck Volume = Truck Length × Truck Width × Truck Height

Legal payload
Legal Payload = Maximum Gross Weight − Truck Tare Weight
If a route payload cap is entered, the lower value is used.

Usable cargo volume
Usable Volume = Truck Volume × Fill Efficiency × (1 − Safety Margin)

Axle-based weight capacity
Available Axle Capacity = Axle Limit − Empty Axle Load
Axle-Based Cargo Capacity = Minimum of:
Front Available ÷ Front Share,
Drive Available ÷ Drive Share,
Trailer Available ÷ Trailer Share

Floor loading capacity
Floor Capacity = Truck Floor Area × Floor Loading Limit × (1 − Safety Margin)

Weight-limited units
Max Units by Weight = Floor(Effective Weight Capacity ÷ Unit Weight)

Space-limited units
Max Units by Volume = Floor(Usable Volume ÷ Unit Volume)
Max Units by Footprint = Best Floor Slots × Allowed Layers
Max Units by Space = Lower of the two space values

Final recommended units
Recommended Allowable Units = Minimum of Max Units by Weight and Max Units by Space

How to Use This Calculator

Enter the truck’s internal length, width, and height in meters.
Provide gross vehicle weight, tare weight, and any route payload restriction.
Enter floor loading and axle limits, then fill in empty axle loads.
Estimate how cargo weight will distribute across front, drive, and trailer axles.
Enter the cargo unit dimensions, unit weight, requested quantity, and stacking layers.
Click Calculate Truck Capacity to see allowable units, usable cube, and load status.
Review the graph and summary table, then export results using CSV or PDF buttons.

Frequently Asked Questions

1. What does this calculator actually measure?

It estimates how many cargo units a truck can carry after checking volume, payload, axle distribution, stacking, and optional floor loading limits.

2. Why can allowable units be lower than legal payload suggests?

A truck may meet gross weight but still fail axle, floor, height, or footprint limits. The calculator uses the tightest safe restriction.

3. What is fill efficiency?

Fill efficiency reflects real loading losses from gaps, bracing, door clearance, packaging shape, and loading patterns. It reduces theoretical cube to a more practical figure.

4. Why should I use a safety margin?

A safety margin accounts for weighing variance, route conditions, packaging changes, and operational uncertainty. It helps planners avoid near-limit loading.

5. How is axle distribution estimated?

You enter the expected percentage of cargo weight carried by each axle group. Those shares are normalized and compared against remaining axle capacity.

6. Can I use this for palletized and non-palletized freight?

Yes. Enter each cargo unit’s actual footprint, height, and weight. The calculator then tests floor arrangement, stacking, and volume automatically.

7. What does the binding constraint mean?

It identifies the main reason capacity stops increasing. That could be weight, volume, or floor footprint and stacking rather than gross legal weight.

8. Is this a replacement for legal compliance checks?

No. It is a planning tool. Always confirm actual axle weights, route rules, cargo securement requirements, and equipment ratings before dispatch.