How Often Should Industrial Scales Be Calibrated?
Most industrial scales should be calibrated at least once a year. Scales that are used heavily, moved often, exposed to weather or vibration, or used to buy and sell product by weight often need calibration every three to six months. The right interval depends on how the scale is used, how much it matters if it is wrong, and any rule set by your quality system, customer or weights and measures authority.
Last updated: November 5, 2026
Recommended Calibration Interval by Scale Type
| Scale type | Typical interval | Calibrate sooner when |
|---|---|---|
| Truck scales | At least once a year | Traffic is heavy, a section reads differently from the others, a junction box is damaged, or after lightning or water damage |
| Rail scales | At least once a year | Use is heavy or the track or structure has changed |
| Floor scales and bench scales | At least once a year | The scale is moved, washed down, or takes dropped or shock loads |
| Counting scales | At least once a year | The scale is relocated or a load cell is replaced |
| Crane scales and dynamometers | At least once a year | After an overload or shock load, or before safety-critical lifts |
| Precision balances | At least once a year; some quality systems require more often | After moving the balance or before critical batches and audits |
These are general intervals, not a regulatory requirement. Your branch can set an interval for your equipment and use after reviewing its history.
Signs Your Scale Needs Calibration Now
- The reading drifts or does not return to zero
- The same load weighs differently on different parts of the scale
- A test-weight check fails
- Cables, junction boxes or load cells are damaged
- The scale was hit by lightning, flooded, or struck by a vehicle
- An audit or customer is asking for a current certificate
Calibration vs. Legal-for-Trade Inspection
Calibration adjusts a scale to traceable reference weights. Scales that buy or sell product by weight are also inspected by your state or local weights and measures authority, which sets its own schedule. Read more in our guide to legal-for-trade vs. non-legal-for-trade scales.
Keep Calibration On Schedule
A preventative maintenance plan keeps calibration on a schedule and catches problems such as worn load cells before they cause a failed check. Learn more about our scale and balance calibration.
Frequently Asked Questions
How often should an industrial scale be calibrated?
Most industrial scales should be calibrated at least once a year. Scales that are used heavily, moved, exposed to weather or vibration, or used to buy and sell product often need calibration every three to six months.
Is calibration the same as a legal-for-trade inspection?
No. Calibration compares a scale against traceable reference weights and adjusts it. A legal-for-trade inspection is done by a state or local weights and measures authority on scales used in commercial transactions, on that authority’s own schedule.
What are signs a scale needs calibration sooner?
Readings that drift, different weights for the same load, failed test-weight checks, damaged cables or junction boxes, and any lightning, water or impact damage.
Does an ISO/IEC 17025 accredited calibration change how often I need it?
No. Accreditation changes the documentation, not the interval. It means the calibration lab was independently assessed for technical competence, and the certificate reports measurement uncertainty and traceability.
Schedule Calibration
Contact your nearest Brechbuhler branch or request service. Our calibration lab is accredited to ISO/IEC 17025 by ANAB (certificate L1051-1) for weighing devices up to 400,000 lb, and on-site calibration is available. See the accreditation and scope page.
