Work out nutrition label per serving instantly with clear inputs, formula shown and shareable results.
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.
Per serving
per serving = pack energy x serving size / pack weight
Per 100 g
per 100 g = pack energy x 100 / pack weight
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.
Per 100 g is the only figure that compares products fairly, because manufacturers choose serving sizes and a small stated serving flatters the label.
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.