How do you calculate moisture loss percentage?

Divide moisture loss weight by starting product weight and multiply by 100. Losing 1,800 lb from a 60,000 lb lot gives a 3% moisture loss rate.

What does the moisture loss gap to target mean?

It is the target minus the actual loss, in points. With a 2.5% target and a 3% actual loss, the gap is -0.5 points, meaning the process over-dried by half a point.

Is a negative moisture loss gap good or bad?

A negative gap means you dried more than targeted, shedding extra saleable weight. In the example, -0.5 points on 60,000 lb is about 300 lb of avoidable shrink, so it is generally undesirable.

What is a typical moisture loss target in milling?

It depends on incoming and finished moisture specs, but conditioning and drying shrink targets often fall in the 1-3% range. The 2.5% target in the example is a common dryer setpoint for grain.

Why is my actual moisture loss higher than target?

Common causes are excessive dryer temperature or dwell time, but fines and dust loss can masquerade as moisture loss. Check finished moisture against spec to confirm the loss is water and not product.

How much weight does over-drying cost?

Each extra point of shrink on a 60,000 lb lot is roughly 600 lb. The half-point over-dry in the example costs about 300 lb of finished product you could have sold.

Grain Milling, Dry Bulk Food & Feed Handling calculator

Moisture Loss Calculator

Moisture loss measures the percentage of weight a product sheds as water during milling, drying or conditioning, expressed against the starting weight. Millers, dryer operators and quality managers track it because moisture is both a yield and a compliance issue: over-drying burns weight you sold by the ton, while under-drying risks spoilage and out-of-spec finished moisture. Comparing actual loss to a target shrink tells you instantly whether the process is running hot or cold. On a 60,000 lb lot, even half a point of unintended shrink is real money.

What this calculator does

Calculate moisture-related weight loss for grain, flour, meal, pellets, or dry ingredients by comparing moisture loss weight with the starting product weight.
Use it when quality, elevator, or production teams need to quantify shrink from drying, tempering, storage, cooling, or handling before updating yield and cost assumptions.
It computes moisture loss as a percentage of starting weight and reports the gap, in points, between that actual loss and your target shrink.

Formula used

Moisture loss rate = moisture loss weight ÷ starting product weight × 100
Moisture loss gap to target = target moisture loss - moisture loss rate

Inputs explained

Moisture loss weight:
Starting product weight:
Target moisture loss:

How to use the result

Use it after drying or conditioning to confirm a lot hit its moisture target, or to investigate yield loss that traces back to over-drying.
It assumes the entire weight difference is water; product fines, dust loss or spillage will inflate the apparent moisture loss and must be ruled out separately.

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 moisture loss percentage? Divide moisture loss weight by starting product weight and multiply by 100. Losing 1,800 lb from a 60,000 lb lot gives a 3% moisture loss rate.
What does the moisture loss gap to target mean? It is the target minus the actual loss, in points. With a 2.5% target and a 3% actual loss, the gap is -0.5 points, meaning the process over-dried by half a point.
Is a negative moisture loss gap good or bad? A negative gap means you dried more than targeted, shedding extra saleable weight. In the example, -0.5 points on 60,000 lb is about 300 lb of avoidable shrink, so it is generally undesirable.
What is a typical moisture loss target in milling? It depends on incoming and finished moisture specs, but conditioning and drying shrink targets often fall in the 1-3% range. The 2.5% target in the example is a common dryer setpoint for grain.
Why is my actual moisture loss higher than target? Common causes are excessive dryer temperature or dwell time, but fines and dust loss can masquerade as moisture loss. Check finished moisture against spec to confirm the loss is water and not product.

Last reviewed 2026-05-12.