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TDEE Calculator - Australia
Rough estimate of Total Daily Energy Expenditure (TDEE) in calories and kilojoules.
Calculate your TDEE
Based on the clinically verified Mifflin-St Jeor equation.
| Your Goal | Calories (kcal) | Kilojoules (kJ) |
|---|---|---|
| General Weight Loss Estimate (−500 kcal deficit) | — | — |
| Mild Weight Loss (−250 kcal) | — | — |
| Maintenance | — | — |
| General Muscle Gain Estimate (+250 kcal) | — | — |
Find your daily energy target
If you’ve ever tried to track your food intake in Australia, you’ve probably been absolutely confused: food labels display kilojoules (kJ), whereas most fitness apps talk in calories (kcal). Between a flood of conflicting advice on cutting carbs, eating more protein, and staying in a caloric deficit, many Australians feel confused about how much they should actually eat.
Well, the good news is that despite all the confusing advice, the science is quite straightforward. Your body burns a certain amount of energy each day based on your size, age, sex, and activity level. This is called your Total Daily Energy Expenditure (TDEE), and understanding it can be a useful starting point for planning your diet and fitness goals.
Hola Health’s free TDEE calculator is designed especially for Australians. It gives your results in both calories and kilojoules, breaks down your Basal Metabolic Rate (BMR), and helps you set your starting macros, whether your goal is weight loss, weight maintenance, or building lean muscle.
IMPORTANT:
The TDEE calculator on this page is a general educational tool based on population-level estimates. It is intended for informational purposes only and does not constitute medical advice, dietary guidance, or a treatment plan.
Calculated results are estimates and may not accurately reflect your individual energy needs, which can vary based on medical conditions, medications, hormonal factors, age, and other personal circumstances.
This tool is not intended to diagnose or manage any health condition. Do not use these results to make significant changes to your diet or exercise routine without first consulting a qualified healthcare professional.
What is TDEE, and how is it calculated?
Total Daily Energy Expenditure (TDEE) is the total number of calories (or kilojoules) your body burns in a day, including everything from basic functions like breathing and circulation to daily activities like walking and exercise. It’s a key number to understand if you’re trying to manage your weight because body weight is largely determined by energy balance:
Energy Balance: Eat more than your TDEE consistently →weight gain. Eat less → weight loss. Eat the same →weight maintenance.
Even small, consistent imbalances add up. A daily surplus of just 200 kJ (48 kcal), roughly half a glass of juice, can lead to gradual weight gain over months and years.
TDEE is not one single process. It consists of four distinct components:
The 4 components of TDEE
| Component | % of TDEE | What it means |
| BMR | 60-70% | Basal Metabolic Rate is the energy your body burns at complete rest to keep vital functions running; breathing, organ function, circulation, and cell repair. It’s your body’s minimum energy requirement. |
| NEAT | 15-30% | Non-Exercise Activity Thermogenesis is the energy you burn through everyday movement outside the gym, like walking, standing, and fidgeting. It varies from person to person and can make a big difference to your daily energy burn. |
| TEF | ~10% | The Thermic Effect of Food is the energy your body uses to digest, absorb, and process nutrients. Protein has the highest thermic effect (20-30%), meaning it requires more energy to digest than carbohydrates or fat. |
| EAT | 5-10% | Exercise Activity Thermogenesis refers to the energy burned during formal workouts. Surprisingly, for most people, this is the smallest part of daily energy use, highlighting the role of NEAT. |
Which BMR equation is best?
Your TDEE calculation begins with an accurate estimate of your BMR. There are several validated formulas available, and each has its own strengths depending on your individual needs.
| Equation | Best for | Notes |
| Mifflin-St Jeor | Most people, the gold standard | This formula is accurate for most adults, usually within about 10%. It takes into account your age, sex, height, and weight, and is now the default method used by the ABS in national nutrition surveys, which is why it’s also the default formula used in our calculator. |
| Revised Harris-Benedict (1984) | General population (alternative) | This is one of the most widely cited equations. Slightly less accurate than Mifflin-St Jeor for modern populations, but still a valid option. |
| Katch-Mc-Ardle | Athletes and those who know their body fat % | This method uses lean body mass rather than total body weight, making it more accurate for individuals with higher muscular mass. It requires an estimate of your body fat percentage. |
| Schofield | Reference only | Used by the Australian NHMRC as a historical reference, but modern research shows it tends to overestimate BMR, especially in non-European populations. |
TDEE and energy balance in Australia
Understanding TDEE is especially relevant for Australians for a few reasons.
To start with, food labels in Australia show energy in kilojoules (kJ), while most international apps and nutrition guides use calories (kcal). They’re simply two different ways of measuring the same thing. The conversion is easy:
1 Kilocalorie (kcal) = 4.184 Kilojoules (kJ)
Example: A 2,000 kcal daily target = 8,368 kJ
In Australia, food energy is usually shown in kilojoules. Calories are still commonly used in fitness apps.
Our calculator outputs both units, so you can match whichever label or app you’re using.
Second, the wider health picture is also important. According to the Australian Institute of Health and Welfare and the Australian Bureau of Statistics, around 66% of Australian adults are now living with overweight and obesity. This is up from 56% in 1995, mainly due to rising obesity rates.
Low physical activity is another key issue. Australian Bureau of Statistics data from 2022 shows that only about 22% of Australian adults met the national exercise guidelines, meaning most Australian adults are effectively sedentary or lightly active. This is the reason why choosing “Sedentary” or “Lightly Active” in a TDEE calculator is often the most accurate option.
The limitations of online TDEE calculators
TDEE calculators are helpful, but they’re not perfect. They provide estimates based on averages and can’t account for individual differences in metabolism.
Here are the key factors that calculators cannot see:
- Hormonal health: Health conditions like Hypothyroidism, Hyperthyroidism, Polycystic ovary syndrome, menopause, and insulin resistance can change your metabolism. For example, someone with an underactive thyroid may burn fewer calories than a calculator predicts.
- Adaptive Thermogenesis: When you lose weight, your body may try to conserve energy by slowing your metabolism. This is called Adaptive Thermogenesis, and it often explains why progress slows over time.
- Body composition and genetics: Two people of the same age, height, weight, and activity level can have different metabolic rates because someone with more muscle usually burns more energy than someone with more body fat.
- Fitness tracker inaccuracy: Fitness trackers and gym machines often overestimate calorie burn, sometimes by 15-40%. This can lead to mistakes when planning your calorie intake.
How to use TDEE estimates correctly:
This calculator estimates your Total Daily Energy Expenditure (TDEE) — the approximate number of kilojoules or calories your body may use in a day based on general population data. Use your calculated TDEE as a starting point, not a fixed answer.
If you find that tracking food intake, calorie counting, or focusing on body weight is causing distress or affecting your relationship with food, please speak with a healthcare professional. Support is available through the National Alliance for Eating Disorders helpline — call 1800 33 4673 or visit butterfly.org.au.
Note: This free calculator is designed for use by adults. Energy requirements for children and adolescents vary significantly and should be assessed by a paediatric healthcare professional.
How to use your TDEE results: Diet and macros
If you’re using this as general context for understanding your energy needs, that’s what this tool is designed for. If you’d like personalised guidance based on your health goals or medical history, we recommend speaking with a qualified healthcare professional.
Your result is a general estimate of how much energy your body may expend daily. It is not a prescribed calorie target, diet plan, or medical recommendation.
Here’s how to read your result:
- Sedentary to lightly active — reflects minimal planned exercise in a typical week
- Moderately active — includes some structured activity most days
- Very active / extra active — reflects regular intense physical activity or a physically demanding occupation
TDEE FAQs
Should I use calories or kilojoules in Australia?
Both are valid. They measure the same thing. Kilojoules (kJ) are the Australian standard and appear on all food labels. Calories (kcal) are the global standard used in most fitness apps and international resources. Our calculator displays both. Just follow a simple rule: multiply kcal by 4.184 to get kJ, or divide kJ by 4.184 to convert back.
Why am I not losing weight eating below my TDEE?
Common causes include:
- Inaccurate food tracking
- Overestimating exercise
- Water retention
- Hidden calories (oils, snacks, drinks)
- Hormonal or medical issues
Does muscle really burn more calories than fat?
Yes. Muscle burns more energy than fat, even when you’re resting. Although the difference per kilogram is small, it adds up over time. TEF (Thermic Effect of Food) helps explain why two people at the same weight can have different metabolic rates based on their body composition.
Should I recalculate my TDEE as I lose weight?
You can recalculate every 3-5 kg of body weight change. As your body weight changes, your BMR changes too, because there is less body mass to maintain.
Do I need to track calories forever?
No. For most people, calorie tracking is a temporary tool to learn portion sizes and understand food choices.
What is the difference between TDEE and BMR?
BMR (Basal Metabolic Rate) is the number of calories your body needs at complete rest to maintain basic life functions, like breathing and circulation. TDEE (Total Daily Energy Expenditure) includes everything you do throughout the day, like walking, working, and exercising. TDEE is always higher than BMR, and is the number that matters most for weight management.
Does TDEE already include my daily exercise?
Yes, that’s what the activity multiplier is for. If you’ve selected the right activity level, your workouts are already included in your TDEE estimate. There’s no need to add back extra calories for workouts.
What is NEAT and why does it matter so much for weight loss?
NEAT (Non-Exercise Activity Thermogenesis) is the energy you burn through daily activities outside the gym, things like walking, housework, or taking the stairs. Increasing these activities can help boost your total daily calorie burn.
Is TDEE calculated differently for men and women?
Biological sex is included in these equations because it affects average body composition and metabolism. However, these are averages, and each person’s metabolism is unique.
Clinical Scope Disclaimer:
The calculators in this section provide general biometric estimates based on standardised population data and mathematical models. They are intended solely for personal tracking and educational purposes. These tools do not replace an individualised clinical assessment. You should always consult your local GP or an accredited practicing dietitian before making significant changes to your diet, exercise regime, or weight management plans.
Please note: Hola Health does not currently provide dedicated medical weight-loss management, specialised bariatric consultations, or weight-loss medication prescribing services.
References
- Overweight and obesity – reference link
- Physical activity – reference link
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