Freight & Logistics

Truck Axle Load Calculator

Estimate static front and rear axle reactions from cargo masses and center positions. Compare SI/US results and review the method, assumptions and related references below.

Change any input to update the calculation. Unit changes preserve the physical quantity.

CALCULATION SETUP

Inputs

Preset

Distance between equivalent axle groups

Measured empty front axle mass

Measured empty rear axle mass

Actual front axle-group rating

Actual rear axle-group rating

Loads

Load 1

Name / label

Mass per cargo item

Identical items at this position

Item center rearward from front axle

Need an input value?

Loading Metre Quick Reference ↗Floor-space conventions do not specify axle CG; measure the actual cargo center.

1 / 50 rows · each row keeps its own units

Calculated locally in your browser. No sign-up or input upload.

YOUR CALCULATION

Results

Estimated front axle mass

3,000 kg6,613.8679 lb

Estimated rear axle mass

4,000 kg8,818.4905 lb

Total vehicle mass

7,000 kg15,432.3584 lb

Added cargo mass

2,000 kg4,409.2452 lb

Cargo CG rearward from front axle

3 m9.8425 ft

Front rating margin

3,000 kg6,613.8679 lb

Rear rating margin

6,000 kg13,227.7357 lb

Front mass share

42.8571 %

Static load reactions at two equivalent axle supports · schematic, not to scale

Calculation breakdown

Example: Front +500 kg; rear +1,500 kg

Assumptions & checks

Two-support rigid-vehicle static model only. No articulated trailer, individual multi-axle distribution, dynamic braking, road legality or chassis approval. Negative axle reaction is rejected.

Formula

Estimate static front and rear axle reactions from cargo masses and center positions

For equivalent supports distance L apart, rear added mass=Σ(mi·xi)/L, front added=Σmi−rear added. Add measured empty axle masses; compare entered ratings. Worked example: Empty axles 2500/2500 kg, supports 4 m apart and 2000 kg cargo at x=3 m gives 3000 kg front and 4000 kg rear.

Worked example

Using the default values shown in the calculator, the same formula gives the following result. This is a quick sanity check for the calculation, not a design recommendation.

Inputs

Distance between equivalent axle groups: 4 m
Measured empty front axle mass: 2500 kg
Measured empty rear axle mass: 2500 kg
Actual front axle-group rating: 6000 kg
Actual rear axle-group rating: 10000 kg
Row 1 · Name / label: Example
Row 1 · Mass per cargo item: 2000 kg
Row 1 · Identical items at this position: 1
Row 1 · Item center rearward from front axle: 3 m

Result

Estimated front axle mass: 3,000 kg
Estimated rear axle mass: 4,000 kg
Total vehicle mass: 7,000 kg
Added cargo mass: 2,000 kg
Cargo CG rearward from front axle: 3 m
Front rating margin: 3,000 kg
Rear rating margin: 6,000 kg
Front mass share: 42.8571 %

Related calculators

Continue your workflow with a related calculation.

View all Freight & Logistics calculators

Freight & Logistics

Loading Meter Calculator

Estimate road-freight loading metres from cargo footprints, quantities and confirmed stack counts with editable trailer width and metric or imperial units.

Freight & Logistics

Container Gross Weight Calculator

Sum loaded container gross mass and compare entered payload and gross ratings. SI/US units, clear methods and related references.

Freight & Logistics

Cartons per Pallet Calculator

Compare grid, rotation and two-block carton layouts. Estimate TI/HI, loaded height, payload, gross weight, pallets required and unused capacity.

Technical references for this calculation

Reference lookupLoading Metre Quick Reference Reference lookupPallet Size Chart

Frequently asked questions

What does this result tell me?

Two-support rigid-vehicle static model only. No articulated trailer, individual multi-axle distribution, dynamic braking, road legality or chassis approval. Negative axle reaction is rejected.

How can I check the calculation?

Worked example: Empty axles 2500/2500 kg, supports 4 m apart and 2000 kg cargo at x=3 m gives 3000 kg front and 4000 kg rear. Review each stated input and unit; use project-specific values rather than treating the editable example as a requirement.

Reference data & method sources

Volvo body builder general information
Static reactions from load moments between two equivalent axle supports. Actual chassis ratings and configuration must be entered.
NIST SI conversion factors
SI/US dimensional conversions. Geometry and energy balances are stated explicitly, not attributed to a design standard.