How do you calculate yield loss?

Divide lost product weight by total input weight and multiply by 100. With 950 lb lost out of 52,000 lb input, the yield loss rate is about 1.83%.

What is a good yield loss rate for a grain mill?

It depends on product and process, but many dry-milling and feed operations target 1-2% total shrink. The example's 1.83% sits just inside a 2% band but exceeds a 1.5% target, leaving a gap to close.

What does a negative gap to target mean?

A negative gap means actual loss exceeds the target. In the example the gap is -0.33 points, since 1.83% actual loss is higher than the 1.5% target — the line is losing more than budgeted.

What causes yield loss in milling?

Moisture shrink during drying, dust captured by aspiration, fines and screenings removed in cleaning, spillage at transfer points, residual product clinging to equipment, and over-aspiration that pulls good product into the dust stream.

How much is yield loss costing me?

Multiply the loss weight by your product value. At 950 lb lost per 52,000 lb batch, even a modest ingredient value times your annual tonnage turns fractions of a percent into a significant yearly number — which is why closing the 0.33-point gap matters.

Is yield loss the same as shrink?

They overlap. Shrink usually refers to total inventory loss including moisture, while yield loss here is any input mass not converted to good product. Moisture removal is often the largest legitimate component and should be tracked separately.

Grain Milling, Dry Bulk Food & Feed Handling calculator

Yield Loss Calculator

Yield Loss measures the percentage of incoming grain or ingredient that a mill fails to convert into salable product, lost to dust, fines, spillage, screenings, and shrink. Operations managers, controllers, and process engineers track it because in a high-volume, thin-margin milling business, a fraction of a percent of yield loss across thousands of tons is real money walking out the door. Comparing actual loss against a target rate shows whether a line is meeting its shrink budget or bleeding product through worn equipment, over-aspiration, or poor housekeeping. It converts a raw loss weight into a rate you can hold accountable shift over shift and benchmark against your standard.

What this calculator does

Calculate milling or feed production yield loss by comparing lost product weight with total input or production weight and a target loss rate.
Use it when production or quality needs to quantify losses from screenings, fines, dust, spillage, rework, rejected feed, off-spec flour, or handling shrink.
It computes the yield loss rate as lost product over total input, then compares that rate to your target to show the gap in percentage points.

Formula used

Yield loss rate = lost product weight ÷ total input or production weight × 100
Yield loss gap to target = target yield loss - yield loss rate

Inputs explained

Lost product weight:
Total grain input processed:
Target yield loss rate:

How to use the result

Use it at shift, day, or lot close to reconcile input against good product and check loss against your shrink budget.
It captures total mass loss but not where it went; it won't distinguish moisture shrink from dust, spillage, or unaccounted theft without a deeper mass balance.

Current U.S. benchmarks

The producer price index for steel mill products stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. Quotes priced off last quarter's material cost miss this move.
Industrial natural gas averages $4.9 per Mcf (EIA, Apr 2026), down 7.7% from a year earlier, with industrial electricity at 8.66 cents per kWh. Process heating and refrigeration budgets track both.
The U.S. has 17,154 machine shops establishments employing about 223,303 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate yield loss? Divide lost product weight by total input weight and multiply by 100. With 950 lb lost out of 52,000 lb input, the yield loss rate is about 1.83%.
What is a good yield loss rate for a grain mill? It depends on product and process, but many dry-milling and feed operations target 1-2% total shrink. The example's 1.83% sits just inside a 2% band but exceeds a 1.5% target, leaving a gap to close.
What does a negative gap to target mean? A negative gap means actual loss exceeds the target. In the example the gap is -0.33 points, since 1.83% actual loss is higher than the 1.5% target — the line is losing more than budgeted.
What causes yield loss in milling? Moisture shrink during drying, dust captured by aspiration, fines and screenings removed in cleaning, spillage at transfer points, residual product clinging to equipment, and over-aspiration that pulls good product into the dust stream.
How much is yield loss costing me? Multiply the loss weight by your product value. At 950 lb lost per 52,000 lb batch, even a modest ingredient value times your annual tonnage turns fractions of a percent into a significant yearly number — which is why closing the 0.33-point gap matters.

Last reviewed 2026-05-12.