Serving Size Standardisation Calculator

Work out serving size standardisation instantly with clear inputs, formula shown and shareable results.

About Serving Size Standardisation Calculator

Serving size must be based on the reference amount customarily consumed for the food category, expressed in whole discrete units where the food comes in units. The serving weight is then the nearest whole number of units to the reference amount, and nutrient values per serving scale from the per-100-gram figures.

Formulas

Serving size

Units per serving = round(reference amount / unit weight); serving weight = units x unit weight

Per serving

Nutrient per serving = nutrient per 100 g x serving weight / 100

Worked example

With the default values below, Serving Size Standardisation Calculator returns Declared Serving Weight of 56.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Package Net Weightminimum 0 g: 450 g
Reference Amount Customarily Consumedminimum 0 g: 55 g
Weight Of One Discrete Unitminimum 0 g: 28 g
Nutrient Content Per 100 gminimum 0: 12

Results

Declared Serving Weight: 56.00
Discrete Units Per Serving: 2
Servings Per Package: 8.04
Nutrient Per Serving: 6.7200

Step by step

1Values used
2Serving size
3Per serving
4Declared Serving Weight= 56.00
5Discrete Units Per Serving= 2
6Servings Per Package= 8.04
7Nutrient Per Serving= 6.7200

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Serving size determination is prescribed by labelling regulation, including reference amounts and dual-column requirements. Confirm the rules for your market.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Serving size determination is prescribed by labelling regulation, including reference amounts and dual-column requirements. Confirm the rules for your market.

Frequently Asked Questions

Can a manufacturer choose the serving size?

Not freely. It must follow the regulated reference amount for the food category, which prevents artificially small servings being used to make nutrient values look favourable.

What if the whole package is a single serving?

Where the package contains less than about two reference amounts, rules generally require it to be labelled as a single serving, with dual-column labelling in some cases.