TDEE Calculator UK – Daily Calorie Needs
TDEE Calculator UK: Calculate Your Daily Calorie Needs
Use our free TDEE calculator UK to estimate how many calories your body burns each day. Enter your age, weight, height and activity level to calculate your total daily energy expenditure.
Total daily energy expenditure, commonly called TDEE, is an estimate of the energy your body uses over 24 hours. It includes the energy needed for essential bodily functions, physical activity and digestion.
Our calculator uses the Mifflin-St Jeor equation to estimate resting energy expenditure and then applies an activity multiplier to estimate your daily maintenance calorie requirements.
Free TDEE Calculator
Enter your measurements and select the activity level that most closely represents your typical week.
The equation uses sex-specific coefficients. Its estimates may be less accurate for people taking gender-affirming hormones or whose body composition differs substantially from the populations used to develop it.
Activity multipliers are approximate. Your occupation, daily movement and exercise intensity can substantially affect your actual energy expenditure.
What Is TDEE?
TDEE stands for total daily energy expenditure. It represents the total amount of energy your body uses throughout a typical day.
Your body requires energy continuously, even when you are resting. Your heart pumps blood, your lungs support breathing, your brain processes information and your organs maintain essential physiological functions.
You also use energy when walking, working, exercising, digesting food and carrying out ordinary activities.
TDEE combines these different components of energy expenditure into an estimated daily total.
Understanding TDEE can help explain the relationship between energy intake, physical activity and changes in body weight.
However, a calculated TDEE is not an exact measurement of your metabolism. It is a prediction based on your measurements and an assumed level of physical activity.
What Are Maintenance Calories?
Maintenance calories are the approximate amount of energy required to maintain your current body weight over time.
If your average energy intake is approximately equal to your average energy expenditure, your body weight may remain relatively stable.
For example, a person with an estimated TDEE of 2,400 calories per day may require approximately that amount to maintain their weight.
Actual requirements can differ from the calculated estimate. Daily movement, body composition, physiological changes and measurement uncertainty can all affect the result.
Body weight also fluctuates naturally because of changes in hydration, digestive contents and other factors.
A single day's weight measurement therefore cannot reliably establish whether an estimated maintenance calorie intake is accurate.
How Does Our TDEE Calculator Work?
The Pryhelm TDEE calculator uses a two-stage calculation.
First, it estimates resting energy expenditure using the Mifflin-St Jeor equation. This formula incorporates your weight, height, age and sex.
Second, the result is multiplied by an activity factor intended to represent your overall daily energy expenditure.
The Mifflin-St Jeor equation is commonly described as a BMR formula, although it more precisely predicts resting metabolic rate.
True basal metabolic rate is measured under more restrictive laboratory conditions.
Mifflin-St Jeor Equation for Men
Mifflin-St Jeor Equation for Women
The calculator converts imperial measurements into metric units before applying the formula.
TDEE Calculation Example
Consider a 30-year-old man who weighs 75 kg and is 175 cm tall.
His estimated resting energy expenditure is calculated as follows:
RMR = (10 × 75) + (6.25 × 175) − (5 × 30) + 5
RMR = 750 + 1,093.75 − 150 + 5
RMR = 1,698.75 kcal/day
If he selects the moderately active category, the calculator uses an activity multiplier of 1.55.
TDEE = 1,698.75 × 1.55
TDEE = 2,633.06 kcal/day
His estimated total daily energy expenditure is therefore approximately 2,633 calories per day.
This is a predicted maintenance energy requirement, not a guarantee that his weight will remain unchanged at that intake.
TDEE Activity Levels Explained
Selecting an appropriate activity level is one of the most important parts of using a TDEE calculator.
Our calculator includes five commonly used activity multipliers. These are general estimates rather than precise measurements of physical activity.
| Activity level | Multiplier | Typical description |
|---|---|---|
| Sedentary | 1.2 | Predominantly seated activities and little exercise. |
| Lightly active | 1.375 | Light exercise approximately 1–3 days per week. |
| Moderately active | 1.55 | Moderate exercise approximately 3–5 days per week. |
| Very active | 1.725 | Frequent exercise or substantial daily physical activity. |
| Extra active | 1.9 | Very demanding training or highly physical daily activity. |
Sedentary Activity Level
The sedentary category is generally intended for people who spend much of their day sitting and undertake relatively little additional physical activity.
Someone who works at a desk, travels by car and rarely exercises may fit this category.
Lightly Active
The lightly active category may suit someone who performs some planned exercise but otherwise has a relatively sedentary daily routine.
Examples might include occasional gym sessions, recreational walking or light exercise several times per week.
Moderately Active
This category may be appropriate for people who exercise regularly and accumulate a meaningful amount of daily movement.
However, exercise frequency alone does not establish total energy expenditure. The duration and intensity of activity also matter.
Very Active
Very active individuals may undertake frequent structured exercise, have physically demanding occupations or accumulate substantial daily movement.
Extra Active
The highest activity category is intended for exceptionally demanding activity patterns.
Examples may include prolonged physical work combined with frequent intensive training.
It should not automatically be selected simply because someone attends the gym most days.
What Is the Difference Between BMR and TDEE?
BMR and TDEE describe different aspects of your body's energy requirements.
Basal metabolic rate refers to the energy required to maintain essential physiological functions under basal conditions.
Total daily energy expenditure includes resting energy needs alongside activity, digestion and other components of energy expenditure.
For most people, TDEE is higher than BMR because everyday activities require additional energy.
For example, someone may have an estimated resting energy requirement of 1,600 calories but an estimated TDEE of 2,200 calories.
The difference reflects the additional energy associated with their daily activities and other components of energy expenditure.
You can explore the resting component separately using our BMR calculator.
The Four Components of Daily Energy Expenditure
Total daily energy expenditure is often described in terms of four main components.
1. Resting Energy Expenditure
Resting energy expenditure represents the energy your body uses to maintain essential functions while at rest.
It is often the largest component of total daily energy expenditure for adults with relatively sedentary lifestyles.
2. Exercise Activity
Exercise activity includes planned physical activities such as running, cycling, swimming, resistance training and organised sports.
The energy required depends on the type, intensity, duration and frequency of exercise.
3. Non-Exercise Activity Thermogenesis
Non-exercise activity thermogenesis, often abbreviated to NEAT, includes energy expended during everyday movement outside planned exercise.
Walking around the house, standing, performing household tasks and moving during work can contribute to NEAT.
Differences in everyday movement can help explain why two people with similar exercise routines may have different total energy requirements.
4. Thermic Effect of Food
The thermic effect of food is the energy used during digestion, absorption and processing of nutrients.
The amount varies according to the quantity and composition of food consumed.
These components are already represented collectively in a typical TDEE estimate. You should not add them again to the calculator's result.
Can TDEE Help With Weight Management?
TDEE can provide a starting point for understanding the relationship between energy intake and expenditure.
Over time, body weight is influenced by energy balance alongside physiological and behavioural factors.
When energy intake consistently exceeds energy expenditure, the body may store some of the additional energy.
When energy intake is consistently below energy expenditure, the body may draw on stored energy.
However, these relationships are dynamic rather than perfectly predictable.
Changes in body weight can influence resting energy requirements, physical activity and other aspects of energy expenditure.
Appetite, sleep, medication, illness and individual physiology can also affect weight management.
For this reason, a calculated TDEE should not be treated as an exact calorie target or a guarantee of a particular weight change.
Anyone with a history of disordered eating, significant unintentional weight change or a medical condition affecting nutrition should seek individual professional guidance.
Can You Use TDEE for Muscle Gain?
People who undertake resistance training sometimes use TDEE estimates when planning their overall nutrition.
Muscle development requires an appropriate training stimulus, sufficient recovery and adequate nutrition.
Protein intake is important, but total energy intake and training quality also contribute to results.
An estimated TDEE can help someone understand their overall energy requirements.
It cannot predict how much muscle they will gain or establish the ideal nutritional approach for every individual.
Training experience, body composition, exercise programming and recovery all influence the outcome.
How Accurate Is a TDEE Calculator?
TDEE calculators are convenient estimation tools, but their accuracy varies between individuals.
There are two main sources of uncertainty.
First, the resting energy equation predicts energy expenditure from a limited set of measurements.
It does not directly measure an individual's metabolic rate.
Second, the activity multiplier is a broad estimate of daily physical activity.
Two people who select the same activity category may have different occupations, exercise intensities and daily movement patterns.
The calculator also cannot fully account for individual differences in body composition or changes in energy expenditure associated with illness and other physiological conditions.
More precise assessment may involve indirect calorimetry for resting energy expenditure or specialised methods for measuring total daily energy expenditure.
These methods are not usually necessary for general educational use, but they illustrate why predictive equations have limitations.
Why Might Your TDEE Change?
Daily energy requirements are not necessarily constant throughout life.
Changes in body weight, body composition, activity and physiological circumstances can influence energy expenditure.
Someone who becomes more physically active may use more energy through exercise and everyday movement.
Conversely, someone who changes from a physically demanding occupation to a predominantly seated role may experience a reduction in activity-related energy expenditure.
Significant changes in body weight can also alter resting energy requirements.
Pregnancy, breastfeeding, illness and certain medications may affect nutritional needs.
A general TDEE calculator is not designed to account for all these circumstances.
TDEE Calculator UK: Metric and Imperial Measurements
Our calculator supports both metric and imperial measurements to make it convenient for visitors in the UK.
You can enter your weight in kilograms and height in centimetres.
Alternatively, select imperial measurements to enter your weight in stone and pounds and your height in feet and inches.
The calculator uses standard conversion factors before applying the Mifflin-St Jeor equation.
- 1 stone equals 14 pounds.
- 1 pound equals 0.45359237 kilograms.
- 1 foot equals 12 inches.
- 1 inch equals 2.54 centimetres.
Both options use the same underlying formula, so the measurement system does not change the calculation method.
Frequently Asked Questions
What does TDEE stand for?
TDEE stands for total daily energy expenditure. It describes the total energy your body uses throughout a typical day, including resting energy, physical activity and digestion.
Is TDEE the same as maintenance calories?
Estimated TDEE is commonly used as an estimate of maintenance calories.
However, actual maintenance requirements can differ from the calculated result because energy expenditure varies between individuals and from day to day.
Is TDEE higher than BMR?
TDEE is generally higher than BMR because it includes the energy required for physical activity, digestion and everyday movement.
Should I use BMR or TDEE?
BMR is useful for understanding estimated resting energy requirements.
TDEE is more relevant when considering total daily energy expenditure because it includes an allowance for activity.
How often should I recalculate my TDEE?
You may wish to recalculate your estimate after meaningful changes in body weight, activity level or other relevant measurements.
Small daily weight fluctuations do not necessarily justify a new calculation.
Does walking affect TDEE?
Yes. Walking contributes to physical activity and daily energy expenditure.
The amount of energy used depends on factors such as duration, walking speed, body size and terrain.
Does strength training increase TDEE?
Resistance training requires energy during exercise and can influence body composition over time.
Changes in lean body mass may also affect resting energy requirements.
The overall effect varies between individuals.
Does TDEE include calories burned during exercise?
Yes. The activity multiplier is intended to account for exercise and other daily activity.
Adding estimated exercise calories again may double-count activity already represented in the TDEE result.
Can I use this calculator during pregnancy?
This calculator does not account for the additional nutritional requirements associated with pregnancy or breastfeeding.
Seek appropriate professional guidance for individual nutritional requirements during these periods.
Is this TDEE calculator suitable for children?
No. This calculator is intended for adults aged 18 and over.
Children and teenagers have different energy requirements, particularly during growth and development.
Can a TDEE calculator diagnose a metabolic condition?
No. TDEE calculators estimate energy expenditure and cannot diagnose metabolic disorders.
Speak to a healthcare professional if you have persistent symptoms or concerns about your metabolism.
References and Further Reading
- Mifflin MD et al. A new predictive equation for resting energy expenditure in healthy individuals. American Journal of Clinical Nutrition. 1990;51(2):241–247. Original study .
- NHS: Healthy weight .
- NHS: Exercise and physical activity .
- NHS: Healthy eating .
This calculator is provided for general educational and informational purposes only. It does not provide medical advice or prescribe an individual calorie intake.
The results are estimates based on a predictive equation and general activity multipliers.
They may not accurately represent your individual energy requirements.
Consult a qualified healthcare professional or registered dietitian if you need personalised nutritional advice, particularly if you have a medical condition, are pregnant or breastfeeding, or have a history of disordered eating.
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