Glossary · Quality & audit
Hectolitre weight meaning
Hectolitre weight is the mass of 100 litres of grain in kg/hl. Learn how wheat test weight is measured, what it signals to a mill and how it differs from TKW.
How is hectolitre weight measured?
Nobody fills a 100-litre drum. Labs and mill gates use a test-weight apparatus, often called a chondrometer: a small container of fixed volume filled through a standard hopper so that grain falls the same way every time. The operator levels the top with a strike-off bar, weighs the contents and scales the result up to 100 litres. Because packing depends on how grain is poured, the same apparatus and method must be used every time for results to be comparable.
Why do millers and buyers care about it?
Plump, well-filled kernels pack tightly and carry more endosperm, the part that becomes flour. Shrivelled, immature, insect-damaged or chaffy grain leaves more air between kernels and reads lighter. So a low test weight is an early warning that the lot may give less flour per tonne, even before a detailed defect count. Moisture affects the reading too, which is why it should be recorded alongside.
In India, hectolitre weight usually appears in a flour mill's or exporter's own intake specification. It is not one of the FCI Fair Average Quality limits that GrainGrade's built-in rulepack checks, which cover foreign matter, other foodgrains, damaged, slightly damaged, shrivelled and broken grains, and moisture. Our guide to wheat quality parameters sets out what each of those checks means.
Worked example: two lots at the gate
Illustrative numbers only. A 1-litre test-weight container is filled from two lots and weighed.
| Lot | Mass in 1 litre | Hectolitre weight |
|---|---|---|
| Lot A | 0.780 kg | 0.780 × 100 = 78.0 kg/hl |
| Lot B | 0.725 kg | 0.725 × 100 = 72.5 kg/hl |
If the mill's own spec sets a minimum between those two figures, Lot B goes for a closer look: a shrivelled and broken count, a moisture reading and a check for foreign matter. The test weight does not say why the lot is light; it says where to look.
How is hectolitre weight different from thousand kernel weight?
- Thousand kernel weight (TKW) is the mass of 1,000 grains. It measures kernel size; hectolitre weight measures how densely a volume of grain packs. A lot can have large kernels and still a modest test weight if they are poorly filled.
- Test weight and hectolitre weight are the same idea. Some markets express it in pounds per bushel instead of kg/hl.
- Uncleaned samples give misleading readings, because straw and dust change how grain packs.
- A photo cannot weigh a volume. Image analysis can count grains and measure their size; wheat grading from a phone photo, which GrainGrade is developing, still needs a meter for moisture and a physical measure for test weight. Our note on what a wheat photo cannot tell you lists the other limits.
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Where this shows up in our work. GrainGrade: A phone photo becomes a count, mm sizes, defect percentages and the FCI FAQ grade — with honest ranges. Book a 30-minute working session with an engineer.
Questions
What is the meaning of hectolitre weight of wheat?
It is the weight of wheat that would fill 100 litres, stated in kilograms per hectolitre. A higher figure usually means plumper, better-filled grain and a better likely flour yield.
What is a good hectolitre weight for wheat?
There is no single figure that applies everywhere. Each flour mill, exporter or contract sets its own minimum, so check the buyer's written intake specification rather than a number quoted informally at the mandi.
Is test weight the same as hectolitre weight?
Yes. Both describe the mass of a fixed volume of grain. Hectolitre weight uses kilograms per 100 litres, while some markets quote test weight in pounds per bushel.