The Average System of Net Quantity Determination

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Accuracy Requirements for Net Quantity Declarations (Competition Bureau Canada)

Under the Average System, the supplier of a packaged a product is responsible for ensuring that consumers receive, on average, the declared quantity as shown on the label.

Principles of the Average System

The declared quantity on a package should accurately reflect the quantity being supplied, so the average net contents of the packages in a lot may not be less than the declared net quantity.

The control over production should be such that the individual packages are within tolerances. No more than 2.5% of the lot may have a negative error larger than the tolerance.

The number of packages which may have excessive negative errors is limited. Not more than one package may contain less than twice the tolerance.

Tolerances for Net Quantities Declared in Metric Units of Mass for Catch Weight Products
Item Declared Net Quantity % Grams
1 more than 0 g to not more than 60 g 10
2 more than 60 g to not more than 600 g 6
3 more than 600 g to not more than 1000 g 1
4 more than 1 kg to not more than 1.5 kg 10
5 more than 1.5 kg to not more than 3 kg 0.66
6 more than 3 kg to not more than 4 kg 20
7 more than 4 kg to not more than 10 kg 0.5
8 more than 10 kg to not more than 15 kg 50
9 more than 15 kg to not more than 250 kg 0.33
10 more than 250 kg to not more than 500 kg 750
11 more than 500 kg 0.15
Tolerances for Net Quantities Declared in Canadian Units of Mass or Weight for Catch Weight Products
Item Declared Net Quantity % Ounces
1 more than 0 oz to not more than 2 oz 10
2 more than 2 oz to not more than 20 oz 0.2
3 more than 1.25 lb to not more than 2.2 lb 1
4 more than 2.2 lb to not more than 3.3 lb 0.35
5 more than 3.3 lb to not more than 6.6 lb 0.66
6 more than 6.6 lb to not more than 8.8 lb 0.71
7 more than 8.8 lb to not more than 22 lb 0.5
8 more than 22 lb to not more than 33 lb 1.76
9 more than 33 lb to not more than 550 lb 0.33
10 more than 550 lb to not more than 1100 lb 26.4
11 more than 1100 lb 0.15
Tolerances for Net Quantities Declared in Metric Units of Mass or Volume for Prepackaged Products Other Than Catch Weight Products
Item Declared Net Quantity
(grams or millilitres)
% g or ml
1 more than 0 to not more than 50 9
2 more than 50 to not more than 100 4.5
3 more than 100 to not more than 200 4.5
4 more than 200 to not more than 300 9
5 more than 300 to not more than 500 3
6 more than 500 to not more than 1000 15
Item Declared Net Quantity
(kilograms or litres)
% g or ml
7 more than 1 to not more than 10 1.5
8 more than 10 to not more than 15 150
9 more than 15 1
Tolerances for Net Quantities Declared in Canadian Units of Mass or Weight for Prepackaged Products Other Than Catch Weight Products
Item Declared Net Quantity
(ounces)
% Oz
1 more than 0 to not more than 1.75 9
2 more than 1.75 to not more than 3.5 0.16
3 more than 3.5 to not more than 7 4.5
4 more than 7 to not more than 10.6 0.32
5 more than 10.6 to not more than 17.6 3
Item Declared Net Quantity
(pounds)
% Oz
6 more than 1.1 to not more than 2.2 0.53
7 more than 2.2 to not more than 22 1.5
8 more than 22 to not more than 33 5.28
9 more than 23 1
Tolerances for Net Quantities Declared in Canadian Units of Volume for Prepackaged Products Other Than Catch Weight Products
Item Declared Net Quantity
(fluid ounces)
% fl oz
1 more than 0 to not more than 1.75 9
2 more than 1.75 to not more than 3.5 0.16
3 more than 3.5 to not more than 7 4.5
4 more than 7 to not more than 10.6 0.32
5 more than 10.6 to not more than 17.6 3
6 more than 17.6 to not more than 35.2 0.53
7 more than 35.2 to not more than 2.2 gallons 1.5
Item Declared Net Quantity
(gallons)
% fl oz
8 more than 2.2 to not more than 3.3 5.28
9 more than 3.3 1
The following table outlines the minimum number of samples required to determine lot pass/fail criteria for the Average System of Net Quantity Determination.
Item Units in the Lot Minimum Sample
1 from 2 to 10 All units in the lot
2 from 11 to 128 25% of units rounded up to the next whole number, but not less than 10
3 from 129 to 4000 32
4 from 4001 to 8000 64
5 from 8001 to 12000 96
6 more than 12000 125
The following table outlines the minimum number of defective prepackaged products per sample size that would fail the lot.
Item Sample Size Minimum Number of Units
1 from 2 to 8 1
2 from 9 to 20 2
3 from 21 to 32 3
4 from 33 to 50 4
5 from 51 to 65 5
6 from 66 to 80 6
7 from 81 to 102 7
8 from 103 to 125 8

More Information

This information bulletin does not include all information about the Average System of Net Quantity Determination. It does not include information on tolerances for products which are not likely to be offered at the retail level of trade. It does not, for example, include information regarding tolerances for products sold by linear measure, dry measure or count. It also does not include information regarding the calculation of weighted averages using linear interpolation.

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