Calculate∑ What your result means
BMI screens body weight relative to height, while Total Daily Energy Expenditure (TDEE) estimates how many calories your body uses in a day including activity.
Australia BMI & Daily Energy Expenditure Calculator
Estimate your BMI and daily calorie needs based on your body stats and activity level.
Your details
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Verified for 2026-27Methodology 2026-27.1 · reviewed 2026-08-08 · review by 2027-06-01
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Compare scenarios
Change weight to see how estimated daily energy needs (tdee) responds.
Understand your result
Clear context for the values above.
Estimated daily energy needs (TDEE)
Estimated daily energy needs (TDEE) is included so you can interpret this estimate and make a better-informed comparison.
Body Mass Index
Body Mass Index is included so you can interpret this estimate and make a better-informed comparison.
Resting metabolic rate (BMR)
Resting metabolic rate (BMR) is included so you can interpret this estimate and make a better-informed comparison.
Weight
Weight is included so you can interpret this estimate and make a better-informed comparison.
How to use this calculator
- 1Enter your current weight, height, age, sex (for bmr formula), bmr sex constant (auto-filled from sex, editable), activity level, activity multiplier (auto-filled from activity level, editable).
- 2Review the headline estimated daily energy needs (tdee) and the supporting figures beside it.
- 3Change one input at a time to see which assumption has the biggest effect.
- 4Confirm current Australian rates and thresholds with an official source before acting.
Explore this calculator
What your result means →The headline estimated daily energy needs (tdee) is based on the inputs currently shown above.Key terms explained →Review the key terms and figures used to calculate this result.How to use this calculator →Enter your figures, review the live result, compare scenarios, then save or print your estimate.The calculation formula →The calculation follows the standard formula for this calculator. Results update whenever an input changes.Worked example →Using the current values produces 2649 kcal/day.Assumptions and limitations →Review the assumptions used to produce this estimate before relying on it.Costs or factors not included →Review any costs, fees or rules not automatically included before making a decision.Frequently asked questions →How accurate is this estimate? What should I check before relying on it? Can I save or share the result?
▦ How this calculator works
BMI is weight in kilograms divided by height in metres squared. Resting metabolic rate uses the Mifflin-St Jeor equation, then is multiplied by an activity factor (from 1.2 for sedentary to 1.9 for very active) to estimate TDEE.
◇ Assumptions and what's not included
BMI doesn't distinguish muscle from fat mass and can be misleading for athletes, older adults or during pregnancy. TDEE is a population-average estimate and individual metabolism can vary meaningfully from the formula's prediction.
▤ What to do next
Use TDEE as a starting point for calorie planning and adjust based on how your actual weight trends over a few weeks, and treat BMI as one screening input among several rather than a full health assessment.
Australia-specific contextFigures use AUD and current published rates and thresholds.
Reviewed for clarityUpdated 3 August 2026.
ImportantFor planning and educational use — not tax, legal or financial advice.
Your privacy mattersInputs stay in your browser.
Frequently asked questions
Is BMI accurate for everyone?+
No — it doesn't account for muscle mass, bone density or body composition, so it can be inaccurate for very muscular or very lean individuals.
What activity level should I select?+
Sedentary means little to no exercise, light is 1–3 light sessions a week, moderate is 3–5 sessions a week, active is daily exercise, and very active means intense daily training or a physical job.
Should I use this instead of medical advice?+
No — this is an educational screening estimate, not a substitute for advice from a doctor or accredited dietitian.
Why does the formula ask for my sex?+
The Mifflin-St Jeor equation uses a different constant for men and women to account for typical differences in body composition affecting resting metabolism.
Official references
Rules and thresholds used by this calculator are labelled for 2026–27 or formula-labelled period. Review the primary guidance before making a filing, borrowing, benefit or investment decision.
Last source review: 3 August 2026. Calculator results are estimates and may exclude circumstances described in the methodology.