Nutrition Label Per Serving Calculator

Work out nutrition label per serving instantly with clear inputs, formula shown and shareable results.

About Nutrition Label Per Serving Calculator

Energy per serving is the pack total scaled by serving size over pack weight, and the per 100 g figure is the same scaling to a fixed 100 g basis. Per 100 g is the only figure that compares products fairly, because manufacturers choose serving sizes and a small stated serving flatters the label.

Formulas

Per serving

per serving = pack energy x serving size / pack weight

Per 100 g

per 100 g = pack energy x 100 / pack weight

Worked example

With the default values below, Nutrition Label Per Serving Calculator returns Energy per serving of 90.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Energy in the whole packminimum 1 kcal: 1,200 kcal
Pack weightminimum 1 g: 400 g
Serving size on the labelminimum 1 g: 30 g

Results

Energy per serving: 90.0 kcal
Energy per 100 g: 300.0 kcal
Servings in the pack: 13.33
Kilojoules per 100 g: 1,255 kJ

Step by step

1Values used
2Per serving
3Per 100 g
4Energy per serving= 90.0 kcal
5Energy per 100 g= 300.0 kcal
6Servings in the pack= 13.33
7Kilojoules per 100 g= 1,255 kJ

Assumptions and limits

The result is derived only from the 3 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 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

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

Frequently Asked Questions

How is the Nutrition Label Per Serving figure worked out?

per serving = pack energy x serving size / pack weight. Energy per serving is the pack total scaled by serving size over pack weight, and the per 100 g figure is the same scaling to a fixed 100 g basis.

Why does this matter?

Per 100 g is the only figure that compares products fairly, because manufacturers choose serving sizes and a small stated serving flatters the label.

What do I need to enter?

Enter energy in the whole pack, pack weight, serving size on the label. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.