Daily Kilojoule Needs Calculator
Estimates daily energy needs in kilojoules based on activity level.
Your result
Estimate only. Results update as you type.
How this calculator works
Energy = BMR × activity factor (1.2 sedentary, 1.375 light, 1.55 moderate, 1.725 very active).
Worth knowing
Treat this as a starting estimate. For personal nutrition advice, talk to a GP or accredited practising dietitian.
Guides for this calculator
- Using a Daily Kilojoule Needs Calculator in Australia: A Step-by-Step Guide
- Common Daily Kilojoule Needs Mistakes (and a Better Way)
Questions
- Are these calculators medical advice?
- No. They provide general information. See your GP or visit healthdirect.gov.au for personal advice.
- Do they work for children?
- No. Adult formulas are used throughout. Children’s growth is assessed differently.
- Where do the formulas come from?
- Each calculator page names the formula used, such as Mifflin-St Jeor for BMR or the US Navy method for body fat.
This calculator gives general estimates using published Australian rates and formulas. It doesn’t consider your personal circumstances. Check current figures with the ATO, your state government or a qualified professional before making decisions. See our disclaimer.