Select the vehicle profile
Choose the truck or trailer configuration so LogicCalc can use the corresponding length, kingpin offset, wheelbase ratios and weight limits.
Cargo weight distribution
Truck Axle Load Calculator
Estimate how cargo weight is distributed between the front support point and the rear axle group. Review cargo position, centre of gravity, vehicle limits and the calculated safe loading zone before finalising the trailer plan.
Cargo positions
Centre of gravity
Axle warnings
Safe zone
Balance workflow
How the axle load estimate works
Cargo placed closer to the front transfers more of its weight to the kingpin or front support point. Cargo placed farther back transfers a larger share to the rear axle group. LogicCalc evaluates every active cargo item and combines the resulting loads.
Add weight and position
Enter the real cargo weight and place each item along the trailer. The longitudinal cargo centre determines its calculated moment.
Review the balance
Check kingpin or front load, rear axle load, combined centre of gravity, overload warnings and the estimated safe loading corridor.
Simplified longitudinal load model
Rear axle share = cargo weight × distance from kingpin ÷ effective wheelbase; front share = cargo weight − rear axle share
Balance inputs
What changes the axle load estimate?
Axle loading depends on more than total cargo weight. The selected vehicle geometry and the longitudinal position of every cargo item can change the distribution significantly.
Vehicle profile
Trailer length, support-point position, effective wheelbase and weight limits come from the active fleet profile.
Cargo weight
The calculation uses the real weight of active cargo items rather than only pallet count or volume.
Longitudinal position
Moving cargo forward increases the front or kingpin share; moving it rearward increases the rear axle share.
Combined centre of gravity
LogicCalc combines cargo moments to show the approximate longitudinal centre of gravity of the complete load.
Configured axle limits
Calculated front and rear loads are compared with the limits derived from the selected vehicle profile.
Estimated safe corridor
The visual safe zone helps identify positions that avoid extreme front or rear loading in the simplified model.
Worked example
Example axle load calculation
Assume active cargo weighs 18,000 kg and its combined centre lies 5.4 metres behind the kingpin. With an illustrative effective wheelbase of 7.8 metres, the simplified rear share is approximately 12,462 kg.
The remaining cargo share, approximately 5,538 kg, is transferred to the kingpin or front support point. Vehicle tare weight and legally permitted axle masses must still be checked separately.
| Balance component | Illustrative value |
|---|---|
| Total active cargo weight | 18,000 kg |
| Distance behind kingpin | 5.4 m |
| Effective wheelbase | 7.8 m |
| Estimated rear axle cargo share | 12,462 kg |
| Estimated front or kingpin cargo share | 5,538 kg |
| Rear share of cargo weight | 69.2% |
| Combined cargo weight | 18,000 kg |
Simplified cargo-only example. Real axle loads also include tractor, trailer, fuel, equipment, passengers and vehicle-specific geometry.
Loading advantages
Why review cargo balance before dispatch?
Move cargo before it becomes a problem
Test longitudinal positions in the planning stage instead of discovering an imbalance at the weighbridge.
See weight and space together
Review axle distribution beside total weight, LDM, CBM and the cargo layout.
Use vehicle-specific assumptions
Switch fleet profiles to reflect different trailer geometry and configured weight capacity.
Keep warnings visible
Front and rear overload states remain visible while the cargo plan is adjusted.
Frequently asked questions
Truck axle load calculator FAQ
What does the LogicCalc axle tool calculate?
It estimates the cargo-weight share transferred to the front support point or kingpin and to the rear axle group using cargo weight, longitudinal position and the active vehicle profile.
Does total cargo weight alone determine axle load?
No. Two loads with the same total weight can produce different axle loads when their centres of gravity are in different positions.
What is the centre of gravity in this calculation?
It is the weighted average longitudinal position of the active cargo items. Heavier items influence the combined centre more strongly.
Can the tool detect an overload?
LogicCalc compares the estimated front and rear cargo loads with configured limits and can display an overload warning in the planning view.
Does the result replace a certified weighbridge?
No. It is a planning estimate. Actual axle loads must be confirmed using the real vehicle specification, legal limits and, when required, an approved weighing method.
Does the model include the empty vehicle weight?
The page example describes cargo distribution. Real legal axle masses also depend on tractor and trailer tare weight, fuel, equipment and the exact vehicle geometry.
Live product preview
See LogicCalc in action
This is a real LogicCalc workspace view. Use your own route, cargo, fleet and commercial settings for the actual calculation.
Open LogicCalc →Truck Center of Gravity Calculator
Use cargo weights and loading positions to estimate the longitudinal center of gravity and how the load is shared through the vehicle geometry. The goal is not merely to fit the cargo, but to see whether its position creates an unhealthy balance or axle-load risk.
cargo weight, cargo length, loading position and truck geometry
longitudinal center of gravity plus balance and axle-load warnings
Describe the vehicle geometry
Use the relevant wheelbase, kingpin and axle positions for the selected configuration. Geometry matters because the same cargo position can produce different reactions on different vehicles.
Place cargo at realistic positions
Enter each item’s weight, length and loading position. Heavy items have a much larger influence on the combined center of gravity than light freight.
Move the load and watch the balance
Review the calculated longitudinal center of gravity and balance or axle warnings. Shift heavy freight forward or backward and recalculate until the distribution is operationally sensible.
Example: two heavy cargo items
If an 8,000 kg item is centred 2 m from the chosen reference and a 6,000 kg item is centred 8 m away, their combined cargo center is about 4.57 m from that reference: (8,000×2 + 6,000×8) / 14,000. Vehicle geometry then determines how that combined load is transferred to the support points and axles.
Moving a heavy item forward or backward changes the longitudinal center of gravity and can shift load between tractor and trailer axles. LogicCalc updates the balance indicators as cargo positions change.
What to verify before loading
Balance calculations are only as good as the geometry, cargo weights and positions entered. Treat the result as a planning aid, not a certification.
- Use actual vehicle geometry and cargo positions; small assumptions can matter when heavy items are concentrated.
- Verify legal axle and axle-group limits for the countries and vehicle combination involved.
- Check load securing, lateral and vertical stability and real axle weights separately where the transport requires them.
Why is center of gravity important if total payload is legal?
Because the same total cargo weight can create very different axle reactions depending on where the cargo is placed. A legal total weight does not guarantee a good distribution.
Does moving one heavy item really make a large difference?
It can. The heavier the item and the farther it moves, the more it shifts the weighted center of gravity and therefore the vehicle reactions.
Is this a substitute for certified axle weighing?
No. It is a planning model based on the dimensions and positions entered. Final legal compliance should be verified with the actual vehicle data and, where required, real axle weights.
Does the calculation cover every type of vehicle stability?
No. The page focuses on the modeled longitudinal balance. Lateral and vertical stability, dynamic effects, load securing and other safety considerations require separate checks.
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Choose the right calculator for the route.
Explore route planning, transport pricing, cargo, driver-time and sustainability tools in one connected workspace.
Check the load position before the truck moves
Add cargo weight and dimensions, place the items in the trailer visualiser and review the centre of gravity and axle distribution together.
The axle calculation is an engineering-style planning estimate, not a legal loading certificate. Verify actual vehicle data, axle limits, cargo securing and measured axle weights before dispatch.