How to Use Truck Scales: A Practical Guide to Accurate Truck Weighing

At first glance, using a truck scale is simple: drive onto the platform, stop and read the weight. That is basically true, but anyone who works around a weighbridge regularly knows that small details matter.

A truck that has not fully entered the platform, a scale that has not returned to zero, mud packed around the weighbridge, or an incorrect tare weight can all create problems with the final record.

This matters even more when truck weights are used to receive raw materials, calculate shipments or settle commercial transactions.

For most operations, the basic process is:

Loaded truck → Gross weight → Load or unload → Empty truck → Tare weight → Net weight

And the calculation is:

Net Weight = Gross Weight − Tare Weight

The following sections explain how this works in day-to-day industrial use.

1. What Happens When a Truck Drives onto a Truck Scale?

A truck scale, or weighbridge, is not just a large steel platform.

When a truck enters the weighbridge, its weight is transferred through the platform to the load cells installed underneath. The load cells convert that force into an electrical signal. The signal is then processed and displayed as a weight value on the indicator.

A typical system looks something like this:

Truck → Weighbridge → Load Cells → Junction Box → Weighing Indicator → Computer / Software

The load cells and weighing indicator are therefore just as important as the steel structure itself.

At a small factory, this may be the complete system. At a large mine, port or logistics yard, cameras, RFID readers, barriers and weighing software may also be connected.

2. Before the Truck Enters the Scale

You do not need a long checklist before every truck. A few basic checks are usually enough.

First, look at the indicator when the weighbridge is empty. It should be at zero.

If it is not, check the platform and the area around it before weighing the next vehicle. Stones, grain, mud, scrap or ice can sometimes collect around the weighbridge and interfere with normal movement.

At sites where different vehicles and materials are handled, it is also worth confirming:

• Vehicle or license plate number

• Material being carried

• Supplier or customer

• Delivery or order number

If this information is entered incorrectly, an accurate weight can still end up attached to the wrong transaction.

3. How to Use a Truck Scale Step by Step

The exact operating procedure varies from one site to another, but most full-truck weighing follows the same basic sequence.

• Step 1: Drive onto the Scale Slowly

Approach the weighbridge at a controlled speed.

Hard braking is unnecessary and puts additional movement into the platform. Where traffic lights or barriers are installed, wait for the signal before entering.

• Step 2: Put the Whole Truck on the Weighbridge

For normal full-truck weighing, all of the required axles need to be on the weighing platform.

This sounds obvious, but it is one of the easiest operating mistakes to make with long tractor-trailer combinations.

The vehicle should sit reasonably centered on the platform and should not touch nearby rails, structures or another vehicle.

• Step 3: Stop and Let the Reading Settle

Once the truck is in position, stop completely.

Do not record the number while the vehicle is still creeping forward or backward. Give the weighing system time to reach a stable reading.

The stable weight will normally be shown on the weighing indicator.

• Step 4: Record the Gross Weight

If the vehicle arrives loaded, the first measurement will normally be its gross weight.

Gross Weight = Truck + Trailer + Cargo

Along with the weight, many companies record the vehicle number, material, supplier or customer, date and time.

The truck can then leave the weighbridge and continue to the loading or unloading point.

• Step 5: Load or Unload the Material

For an incoming delivery, the truck usually unloads its material before returning to the scale.

An outbound vehicle may follow the opposite sequence: weigh empty first, load the material, then return for the loaded weight.

Either method works. The important point is that the two readings belong to the same vehicle and transaction.

• Step 6: Weigh the Empty Truck

After unloading, the vehicle returns to the weighbridge.

Again, the truck should be fully on the platform and stationary before the reading is taken.

This measurement is the tare weight.

Tare Weight = Empty Truck + Trailer

• Step 7: Calculate the Actual Cargo Weight

Now the actual material weight can be calculated.

For example:

Gross Weight: 42,580 kg

Tare Weight: 15,320 kg

Therefore:

Net Weight = 42,580 − 15,320 = 27,260 kg

The cargo in this example weighs 27,260 kg.

With modern weighing software, the operator normally does not need to calculate this manually.

Step 8: Save or Print the Weighing Ticket

Once both readings are complete, the transaction can be closed.

Some sites still print paper tickets. Others store the information directly in weighing software or send it to an ERP system.

4. Truck Scale Use Is Different from One Industry to Another

The weighing principle stays the same. The working conditions do not.

• Mining and Quarrying

Mining sites may weigh ore, coal, stone, sand or aggregate. Heavy axle loads, dust and frequent vehicle movements put more demand on the weighbridge and load cells.

• Grain and Feed

At grain terminals and feed plants, weighing records may need to match a supplier, grain type, silo or production batch.

• Manufacturing

Factories often use truck scales for incoming raw materials and outgoing finished products. In this case, connection with inventory or ERP systems can be useful.

• Waste and Recycling

A loaded vehicle enters, gets weighed, unloads and returns to the scale. The difference between the two readings tells the operator how much material was received.

5. What Changes with an Unattended Truck Scale?

The weighing principle does not change when a truck scale becomes automated.

What changes is everything around the weighing process.

Instead of an operator checking every license plate and typing every weight into a computer, an automated station can handle some or all of these steps.

A typical process might be:

Truck arrives → RFID/License Plate Recognition → Barrier opens → Truck enters → Stable weight captured → Camera records → Data saved → Truck leaves

Depending on the site, the system may include:

For a factory weighing 15 trucks a day, full automation may not be necessary. For a mine, logistics yard or bulk terminal processing hundreds of vehicles, the calculation can be very different.

6. Keeping Truck Weighing Accurate

Truck scale accuracy is not only about calibration.

Day-to-day housekeeping and operating habits make a difference too.

Useful practices include:

A scale working at a dusty mine will naturally need different attention from one installed in a clean factory yard.

7. Manual or Automated Truck Weighing?

Neither option is automatically better. It depends on the site.

Function	Manual System	Automated System
Vehicle identification	Operator	RFID / ANPR
Weight recording	Manual/software	Automatic
Traffic control	Operator	Lights/barriers
Camera records	Optional	Usually integrated
Data management	Basic	Centralized
ERP connection	Optional	Easier to integrate
Typical use	Lower traffic	Medium/high traffic

For low traffic, keeping the system simple can make sense.

As traffic increases, automation becomes more useful because it reduces repeated data entry and helps connect vehicle movement with weighing records.

8. FAQ

9. Conclusion

Using a truck scale is not complicated. Getting consistent, reliable records is where good operating practice matters.

Get the whole vehicle onto the platform. Let it stop. Wait for the reading to stabilize. Make sure gross and tare weights belong to the correct truck. Keep the scale clean and deal with unusual zero readings rather than ignoring them.

Those habits are simple, but they solve many of the problems seen in everyday truck weighing.

For sites with only occasional truck traffic, a conventional weighbridge and indicator may be all that is needed. Where traffic is heavier, adding vehicle identification, cameras, barriers and weighing software can make the process easier to manage.