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Food Energy Toolkit (Australia)

Quick calculators for kJ-first food labels: conversions, serving maths, daily reference %, and meal totals.
Start with the converter, then use serving and daily reference tools for deeper tracking.

Start here

A simple path that matches how energy appears on Australian labels.

  1. Convert label energy to your tracking unit: kJ → calories (kcal) or calories (kcal) → kJ.
  2. If the label shows per 100g, convert to your portion: Energy per Serving.
  3. Compare against the daily reference: Daily kJ Intake.
  4. Add multiple items for a meal total: Meal Energy.

General information only — not medical advice.

KJ to CAL Calculator

Convert kJ to calories (kcal) instantly.

CAL to KJ Calculator

Convert calories (kcal) to kilojoules (kJ).

Daily KJ Intake Calculator

Calculate daily reference % and remaining energy.

Energy per Serving Calculator

Convert per 100g ↔ per serve using grams.

Meal Energy Calculator

Add multiple food items to estimate total meal energy.

Learn the basics

Quick guides to understand kJ, calories, and Australian food labels.

How to read energy on food labels

Food labels show energy in kilojoules (kJ). Many apps and international resources still use calories (kcal), so conversions are often needed.

Energy is commonly shown in two formats:

  • Per 100g / 100mL (useful for comparing products)
  • Per serve (useful for what you actually eat)

Many labels also use 8,700 kJ per day as a general reference value. It’s a label reference — individual needs vary by body size, age, and activity level.

Want quick answers? Check the FAQ.

Frequently Asked Questions

Quick answers about kJ, calories, and using the calculators.