How do you calculate batch weigh accuracy?

Divide the tonnage batched within tolerance by the total tonnage weighed in the same period, then multiply by 100. With 850 tons in tolerance out of 1,000 tons total, accuracy is 85%.

What is a good batch weigh accuracy percentage?

Well-maintained gravimetric batching typically holds 98-99.5% within tolerance. The 85% in our example, against a 95% target, is a 10-point gap that points to a real scale, feeder, or tolerance-setting problem.

Why is my batch weigh accuracy below target?

Common causes are an uncalibrated or drifting load cell, material build-up on the scale or in the hopper, in-flight (free-fall) compensation set wrong, or a tolerance band too tight for the material's flow behavior.

Batch weigh accuracy vs feeder rate accuracy: what's the difference?

Batch weigh accuracy checks whether the delivered mass hit the target per batch; feeder rate accuracy checks whether the flow rate held steady over time. A feeder can run the right average rate yet still miss individual batch weights.

How often should I check batch weigh accuracy?

Trend it every shift and recompute after each scale calibration, recipe change, or material supplier switch. A sudden drop usually signals a mechanical or calibration fault rather than normal variation.

Does this account for in-flight material?

No. The calculator only compares in-tolerance tonnage to total tonnage. If your controller's free-fall compensation is off, that error shows up as reduced accuracy here but you must fix the compensation in the batch controller itself.

Bulk Solids, Mining, Aggregates & Material Processing calculator

Batch Weigh Accuracy Calculator

Batch Weigh Accuracy measures what share of your gravimetric batching tonnage actually landed inside the recipe tolerance versus everything that ran across the scales. Plant operators, quality engineers, and process owners in aggregate plants, cement works, and mineral processing lines use it to prove that loss-in-weight feeders and batch scales are delivering the right blend, not just moving volume. It matters because an out-of-tolerance batch on a continuous mix line silently shifts your gradation, binder content, or assay long before a lab result flags it. Tracking accuracy as a percentage gives you one honest number to compare scales, shifts, and material types.

What this calculator does

Estimate batch weigh accuracy for batch weigh accuracy for bulk solids, mining, aggregates, and material processing using plant-floor material, production, quality, capacity, or cost inputs.
a plant team is reviewing batch weigh accuracy for bulk solids, mining, aggregates, and material processing and needs a clear batch weigh accuracy for production, quality, capacity, maintenance, purchasing, or costing decisions
It computes the percentage of total weighed tonnage that was batched within tolerance, plus the point gap to your accuracy target.

Formula used

Batch Weigh Accuracy = batch weigh accuracy accepted or affected material ÷ total ore, aggregate, powder, sand, gravel, fines, or bulk solid in same period × 100
Gap to target = target - batch weigh accuracy

Inputs explained

Weight correctly batched within tolerance:
Total material weighed in the same period:
Target batch weigh accuracy:

How to use the result

Use it during shift handovers, after scale calibration, or when a downstream blend spec drifts and you need to isolate whether batching is the culprit.
It treats every ton equally, so a single large out-of-tolerance batch and many tiny ones can read the same; it does not tell you the direction or magnitude of each weighing error.

Common questions

How do you calculate batch weigh accuracy? Divide the tonnage batched within tolerance by the total tonnage weighed in the same period, then multiply by 100. With 850 tons in tolerance out of 1,000 tons total, accuracy is 85%.
What is a good batch weigh accuracy percentage? Well-maintained gravimetric batching typically holds 98-99.5% within tolerance. The 85% in our example, against a 95% target, is a 10-point gap that points to a real scale, feeder, or tolerance-setting problem.
Why is my batch weigh accuracy below target? Common causes are an uncalibrated or drifting load cell, material build-up on the scale or in the hopper, in-flight (free-fall) compensation set wrong, or a tolerance band too tight for the material's flow behavior.
Batch weigh accuracy vs feeder rate accuracy: what's the difference? Batch weigh accuracy checks whether the delivered mass hit the target per batch; feeder rate accuracy checks whether the flow rate held steady over time. A feeder can run the right average rate yet still miss individual batch weights.
How often should I check batch weigh accuracy? Trend it every shift and recompute after each scale calibration, recipe change, or material supplier switch. A sudden drop usually signals a mechanical or calibration fault rather than normal variation.

Last reviewed 2026-05-12.