BMR Calculator
Estimates the energy your body uses at rest, in kilojoules and calories.
Your result
Estimate only. Results update as you type.
How this calculator works
Mifflin-St Jeor: 10 × weight + 6.25 × height − 5 × age + 5 (men) or − 161 (women). 1 kcal = 4.184 kJ.
Worth knowing
Australian food labels use kilojoules, so the kJ figure is easiest to compare with what you eat.
Guides for this calculator
- BMR Calculator: Formula, Example and What the Result Means
- BMR: What to Check Before You Trust the Number
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.