Grain Moisture Loss Calculator

A free grain moisture percentage calculator that converts wet-basis moisture into g/kg and basis points instantly. Use the free Grain Moisture Loss Calculator below — enter your values and get instant results, right in your browser. Conversions are exact ratios: 1% moisture = 10 g/kg = 100 basis points. Moisture shrink on drying follows: Dry weight = Wet weight × (100 − initial moisture %) ÷ (100 − final moisture %). Example: 1000 kg at 18% dried to 12% gives 1000 × 82 ÷ 88 = 931.8 kg, a shrink of 68.2 kg.

How to use the Grain Moisture Loss Calculator

Grain buyers, millers, and farmers quote moisture on different scales — a wheat lot at 14% wet-basis moisture is the same as 140 g/kg, and drying contracts often price in moisture points. This grain moisture percentage calculator converts between percent, grams per kilogram, and basis points so you can read lab reports, dryer charges, and trader quotes without mental math. Getting moisture right matters because every extra point of moisture means lost dry weight and a higher risk of fungus and aflatoxin in storage.

  1. Type the moisture reading in the amount box — for example 14 from your moisture meter.
  2. Pick the unit of your reading in the From dropdown (usually Percent % wet basis).
  3. Pick the unit you want in the To dropdown, e.g. Grams per kilogram (g/kg).
  4. Read the converted value in the big result line — it updates live as you type.
  5. Tap the swap button (⇄) to reverse the conversion direction instantly.

Formula

Conversions are exact ratios: 1% moisture = 10 g/kg = 100 basis points. Moisture shrink on drying follows: Dry weight = Wet weight × (100 − initial moisture %) ÷ (100 − final moisture %). Example: 1000 kg at 18% dried to 12% gives 1000 × 82 ÷ 88 = 931.8 kg, a shrink of 68.2 kg.

Worked example

A farmer's wheat tests at 15.5% moisture (wet basis) and the mill pays in g/kg. Entering 15.5 with From = Percent % and To = Grams per kilogram gives 155 g/kg. In basis points that is 1,550 bp. If he dries 2,000 kg from 15.5% down to 12%, shrink = 2000 − 2000 × 84.5 ÷ 88 = 79.5 kg of water lost.

Frequently asked questions

Wheat should be dried to 12% moisture or below for safe storage of 6–12 months. Above 14%, the risk of mold, heating, and aflatoxin rises sharply, especially in warm Pakistani summers.

Wet-basis moisture is water weight divided by total (wet) weight — the standard in grain trade. Dry-basis divides by dry weight only, so it always reads higher. This converter uses wet basis, the unit your moisture meter shows.

Use the shrink formula: dry weight = wet weight × (100 − start %) ÷ (100 − target %). Drying 1,000 kg of paddy from 20% to 14% loses about 69.8 kg of water weight.

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