Per 100g vs per serve on Australian labels

Per 100g (or per 100mL for liquids) shows the energy density of a product. It's a standardised format that makes it easier to compare products fairly, regardless of pack size or serving size.

This is useful when comparing similar items from different brands because it reduces the impact of different serving sizes.

Per serve shows the energy in the portion size listed on the label. It's practical when the label serving matches what you plan to eat.

Serving sizes are set by the manufacturer and can differ between products, even in the same category.

Use per 100g when:

• Comparing similar products from different brands
• Understanding energy density
• Calculating energy for a custom portion size

Use per serve when:

• Tracking what you actually eat in one portion
• The label serving size matches your typical portion
• Adding items together for a meal total

Converting between per 100g and per serve is proportional scaling. The formula is:

Example: if a product has 1,500 kJ per 100g and the serving size is 150g: (1,500 ÷ 100) × 150 = 2,250 kJ per serve.

Use the Energy per Serving calculator to do this conversion instantly in both directions.

Showing both formats is useful because they answer different questions: per 100g supports fair comparisons, while per serve reflects a practical portion.

Using both together helps you compare products and estimate meal totals more consistently.