UK Label Rounding Rule and the Difference Between the UK Label Compared to the Legacy and 2018 Label

this is a copy of this internal wiki entry. This means that there are a few links that are for a private repo

the main task for this is https://github.com/mattsilvllc/Nutritionix-Yii/issues/351

for the uk label rounding rule, based on this https://github.com/mattsilvllc/Nutritionix-Yii/issues/3511#issuecomment-467041087

kcal and kj should both be rounded to the nearest one on this label.

Fat, Carbohydrate, Sugars, Fiber, and Protein should be rounded to the nearest one if greater than or equal to 10g, to the nearest 0.1g if <10g and >0.5g, and listed as <0.5g if <0.5g and >0g

Saturated fat should be rounded to the nearest one if greater than or equal to 10g, to the nearest 0.1g if <10g and >0.1g and listed as <0.1g if <0.1g and >0g

Salt should be rounded to the nearest 0.1g if greater than or equal to 1g, to the nearest 0.01g if <1g and >0.0125g and listed as <0.01 if < 0.0125g and >0g

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for the legacy and uk label, the rounding rule is https://www.fda.gov/ICECI/Inspections/InspectionGuides/ucm114098.htm

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the difference of the UK rounding rules and the legacy or 2018 label

attribute name	rounding rule for the uk label	rounding rule for the legacy and 2018 label
energy kj (calories * 4.184)	round to the nearest one	not applicable
calories / energy kcal	round to the nearest one	< 5 cal - express as zero
		< or = 50 cal - express to nearest 5 cal Increment
		> 50 cal - express to nearest 10 cal increment
fat calories	not applicable	< 5 cal - express as zero
		< or = 50 cal - express to nearest 5 cal Increment
		> 50 cal - express to nearest 10 cal increment
total fat	rounded to the nearest one if greater than or equal to 10g	> or = 5g - express to nearest 1g increment
	to the nearest 0.1g if <10g and >0.5g	< 5g - express in nearest 0.5g increment
	and listed as <0.5g if <0.5g and >0g	<0.5g - express as zero
saturated fat	rounded to the nearest one if greater than or equal to 10g	> or = 5g - express to nearest 1g increment
	to the nearest 0.1g if <10g and >0.1g	5g - express to nearest 0.5g increment
	and listed as <0.1g if <0.1g and >0g	<0.5g - express as zero
polyunsaturated fat	not applicable	> or = 5g - express to nearest 1g increment
		< 5g - express in nearest 0.5g increment
		<0.5g - express as zero
monounsaturated fat	not applicable	> or = 5g - express to nearest 1g increment
		< 5g - express in nearest 0.5g increment
		<0.5g - express as zero
trans fat	not applicable	> or = 5g - express to nearest 1g increment
		< 5g - express in nearest 0.5g increment
		<0.5g - express as zero
cholesterol	not applicable	> 5 mg - express to nearest 5 mg Increment
		2 - 5 mg - express as "less than 5 mg"
		<2 mg - express as zero
sodium / salt	rounded to the nearest 0.1g if greater than or equal to 1g	> 140 mg - express to nearest 10 mg increment
(salt = sodium * 0.0025)	to the nearest 0.01g if <1g and >0.0125g	5 - 140 mg - express to nearest 5 mg Increment
	and listed as <0.01 if < 0.0125g and >0g	< 5 mg - express as zero
carbohydrate	rounded to the nearest one if greater than or equal to 10g	> or = 1g - express to nearest 1g increment
	to the nearest 0.1g if <10g and >0.5g	< 1g - express as "Contains less than 1g " OR "less than 1g"
	and listed as <0.5g if <0.5g and >0g	< 0.5g - express as zero
fiber	rounded to the nearest one if greater than or equal to 10g	> or = 1g - express to nearest 1g increment
	to the nearest 0.1g if <10g and >0.5g	< 1g - express as "Contains less than 1g" OR "less than 1g"
	and listed as <0.5g if <0.5g and >0g	< 0.5g - express as zero
sugars	rounded to the nearest one if greater than or equal to 10g	> or = 1g - express to nearest 1g increment
	to the nearest 0.1g if <10g and >0.5g	< 1g - express as "Contains less than 1g" OR "less than 1g"
	and listed as <0.5g if <0.5g and >0g	< 0.5g - express as zero
protein	rounded to the nearest one if greater than or equal to 10g	> or = 1g - express to nearest 1g increment
	to the nearest 0.1g if <10g and >0.5g	< 1g - express as "Contains less than 1g" OR "less than 1g"
	and listed as <0.5g if <0.5g and >0g	< 0.5g - express as zero
vitamin a / vitamin c / vitamin d / iron / calcium	not applicable	>50 - round to the nearest ten
		<=50 - round to the nearest five
		<=10 - round to the nearest two
		<1 express as zero