What is Grain Density?

Grain density refers to the mass-per-unit volume of a specific grain. Bulk density is typically measured in tonnes per cubic metre (t/m 3 ) and is a crucial parameter that affects grain transportation, storage, and processing.

You can estimate bulk density by weighing 1 litre of grain. Its weight in kilograms is the bulk density in tonnes per cubic metre.

1 kg per litre (kg/L) = 1 metric tonne per cubic metre (t/m 3 )

Common Units


Hectolitres are a common metric unit used in the agricultural industry to measure large volumes of grains and other farm produce. To convert litres (L) to Hectolitres (hL), divide the value by 100.

eg: 100 Litres = 1 Hectolitre 


A bushel is a volume unit used in the United States and (less commonly) in Australia to measure grain quantity. Unlike metric units such as kilograms or tonnes, which measure weight, a bushel measures volume. However, it is often converted to weight for practical purposes since the weight of a bushel can vary depending on the type and condition of the grain.

For example, one bushel of:

  • Wheat typically weighs about 60 pounds (27.2 kg).
  • Corn typically weighs about 56 pounds (25.4 kg).
  • Barley typically weighs about 48 pounds (21.8 kg).
  • Oats typically weigh about 32 pounds (14.5 kg).

Chaser Bin Capacity

Our chaser bin models are named based on their wheat-holding capacity. For instance:

  • Our 25T chaser bin holds approximately 25 tonnes of wheat
  • Our 30T chaser bin holds approximately 30 tonnes of wheat
  • Our 35T chaser bin holds approximately 35 tonnes of wheat

Davimac models may hold more weight than their wheat rating if the overall loaded weight (including the machine's weight) does not exceed the undercarriage rating .

For example, the 35T model can hold over 37 tonnes of lentils, as the total weight of the empty machine (approx 14. tonnes) + 37 tonne load is less than the undercarriage rating of 80 tonnes. 

Davimac Chaser Bin in Field

Understanding the Total Loaded Weight of Your Chaser Bin

Operators must always be aware of the total weight of their fully loaded chaser bin, including the weight of the empty machine plus any load

Knowing the total loaded weight is essential when determining the chaser bin's safe carrying capacity, selecting a tractor with an appropriate towing capacity, matching the chaser bin size to your combine harvester size or farming operation, and understanding the impact heavy farm machinery loads have on the soil, such as soil compaction. 

Calculating Crop Load

To calculate the weight of a full load of wheat, we can use the following formula:

Bin Volume (L) x Bulk Density (kg/L) = Bin Capacity (kg)

For example, the weight of a full load of wheat in our 35T model can be calculated by inputting the values from the chart below into the above formula:

46,000 L (bin capacity ) x 0.77 (wheat density) = 35,420 kg (bin capacity)

Therefore, we can determine that the Davimac 35T chaser bin model can hold 35,420 kg of weight in its bin, or just over 35 tonnes. 

Chaser Bin Load Ratings

Chaser bin load ratings and empty machine weights can be found in the Davimac Chaser Bin Operators Manual .

Empty Machine Weights

Chaser bins are inherently heavy due to their requirement to hold large quantities of grain and their nature as large farm machinery. The approximate empty machine weights of Davimac Chaser Bin models are listed below: 

  • 25T Single Axle = 8.7 tonnes (8,700 kg)
  • 30T Single Axle = 10 tonnes (10,000 kg)
  • 30T Dual Axle = 13 tonnes (13,000 kg)
  • 35T Dual Axle = 14.3 tonnes (14,300 kg)
Empty Davimac Chaser Bin chasing header in field to be filled

Undercarriage Ratings (Axle Capacity)

Davimac chaser bin models feature ultra-robust, over-engineered undercarriages rated well above the chaser bin's total loaded weight. This design provides reliability and peace of mind during harvest without the fear of the undercarriage breaking, requiring costly repairs and unaffordable downtime. 

  • Single Axle chaser bin models = 40-tonne axle capacity
  • Dual Axle chaser bin models = 80-tonne axle capacity

Calculating Total Loaded Weight

The total loaded weight of the chaser bin must not exceed the total undercarriage rating. To calculate the total loaded weight, we add together the empty machine weight and the crop load:

Empty Machine Weight (kg) + Crop Load (kg) = Total Loaded Weight (kg)

Continuing with the example of our 35T model, the maximum total loaded weight can be calculated by inputting the known empty weight of the machine, as well as the crop load already calculated above, into the formula:

14,300 kg (empty weight) + 35,420 kg (max. wheat load) = 49,720 kg

Therefore, we know that the Total Loaded Weight of the Davimac 35T chaser bin model will be 49.72 tonnes when carrying a full load of wheat.

Carrying Crops Other Than Wheat

Davimac models may be able to hold more weight than their wheat rating if the overall loaded weight (including the machine's weight) does not exceed the undercarriage rating.

Davimac 35T chaser bin being filled to capacity with canola grain

For example, according to the table below, the 35T model can hold over 37 tonnes of lentils, as the total weight of the machine (14.3 tonnes) + full lentil load (37 tonnes) is less than the undercarriage rating of 80 tonnes. 

Davimac Features: Know Your Load

Load Cells (Scales)

Davimac Chaser Bins can be optioned with load cells with an in-cab calibrated indicator so operators know how much grain is in their bin at all times. This is important for safety as well as helpful when needing to unload specific amounts into a waiting semi-truck or mother bin. These values can also be wirelessly transmitted to Harvest Management Software for real-time accurate load and yield data.  

Grain Sampling Valve

All davimac bins come standard with a grain sample valve on the side of the bin for easy in-the-field quality control and moisture testing. Operators can easily retrieve grain samples from the valve using a simple lever.

Grain sampling hose on Chaser Bin

Grain Weight and Density Chart

To better compare our chaser bin capacities for a given crop, we have provided the below chart detailing typical bulk densities for common grains and the total weight (kg) when filled. We have also included the equivalent bushels value of that crop for reference.

Note that the bulk density values provided are average and will vary depending on crop size, variety, moisture content, and quality. Valued from other sources may differ slightly.

Grain Weight and Density Chart 25T 30T 35T
Bin Capacity: 33,000 L 40,000 L 46,000 L
Crop: Bulk Density*
/ ton
Capacity (kg) Bushels
Capacity (kg) Bushels
Capacity (kg) Bushels
Barley 0.68 45.9 22,440 1,030 27,200 1,248 31,280 1,436
Canola 0.67 44.1 22,110 975 26,800 1,182 30,820 1,359
Chickpea 0.74 36.7 24,420 896 29,600 1,086 34,040 1,249
Cotton seed 0.4 30.8 13,200 407 16,000 493 18,400 567
Faba bean 0.76 36.7 25,080 920 30,400 1,116 34,960 1,283
Field pea 0.71 36.7 23,430 860 28,400 1,042 32,660 1,199
Lentil 0.81 36.7 26,730 981 32,400 1,189 37,260 1,367
Linseed 0.73 39.4 24,090 949 29,200 1,150 33,580 1,323
Lupin 0.8 36.7 26,400 969 32,000 1,174 36,800 1,351
Maize 0.72 39.4 23,760 936 28,800 1,135 33,120 1,305
Mung bean 0.75 36.7 24,750 908 30,000 1,101 34,500 1,266
Oat 0.5 64.8 16,500 1,069 20,000 1,296 23,000 1,490
Rapeseed 0.67 44.1 22,110 975 26,800 1,182 30,820 1,359
Rice 0.72 49 23,760 1,164 28,800 1,411 33,120 1,623
Rye 0.71 39.4 23,430 923 28,400 1,119 32,660 1,287
Safflower 0.53 58 17,490 1,014 21,200 1,230 24,380 1,414
Sorghum 0.73 39.4 24,090 949 29,200 1,150 33,580 1,323
Soybean 0.75 36.7 24,750 908 30,000 1,101 34,500 1,266
Sunflower seed 0.42 73.5 13,860 1,019 16,800 1,235 19,320 1,420
Triticale 0.62 40 20,460 818 24,800 992 28,520 1,141
Wheat 0.77 36.744 25,410 934 30,800 1,132 35,420 1,301
*Grains and legumes vary according to moisture content, size and variety. The above values are a guide only.
February 16, 2024