Daily calorie intake calculator

Estimate your daily calorie needs based on your age, sex, height, weight and activity level, then get a guide shaped around your goal.

Start with your everyday routine

Answer a few quick questions to estimate your daily energy needs and see a practical range based on your goal.

17% complete About you

Tell us about you

These four details are used to estimate your resting energy needs. Your entries stay in this browser.

Sex used for the calorie equation
years
cm
kg

How active is a typical week?

Choose the option that best reflects most of your week, not your most active day.

What’s your main goal?

Choose the goal that best matches what you want to work towards.

What matters most to you?

Understanding what matters to you helps make the next step feel more relevant.

Choose the answer that feels closest to you. There’s no right or wrong answer.

Small steps. BIG progress.

A useful number is only the beginning. What matters most is finding an approach you can actually maintain in everyday life.

Your result

Use this as a practical starting estimate, not a strict prescription.

Estimated daily planning range
— kcal/day

Your result will appear here.

Resting energy — kcal/day
Estimated maintenance — kcal/day
Your goal —
Typical activity —

How your daily energy is estimated

Your resting energy uses your age, sex, height and weight. Your selected activity level is then used to estimate maintenance energy before your goal is applied.

Resting energy — kcal Estimated energy used at rest
Daily activity estimate — kcal Includes everyday movement and your selected activity level — not an exercise target
Maintenance — kcal Estimated centre point
Your goal midpoint — kcal Adjusted for your selected goal

Your daily nutrition guide

A practical breakdown of protein, carbohydrate, fat and fibre based on your calorie range and selected goal.

Protein
— g/day Supports muscle maintenance and repair.
Carbohydrate
— g/day Main source of dietary energy.
Fat
— g/day Part of a balanced overall intake.
Fibre
20–30 g/day From vegetables, fruit, legumes and whole grains.

These are planning ranges, not a meal prescription. Protein is based on your body weight and goal; fat is kept around 25–30% of goal calories; carbohydrate uses the remaining energy; fibre is shown separately. Do not combine every upper limit as a single target. A dietitian can personalise the plan around your health, training, appetite and food preferences.

Sources: Mifflin MD et al., American Journal of Clinical Nutrition (1990); Ministry of Health Malaysia, Recommended Nutrient Intakes for Malaysia 2017 and Malaysian Dietary Guidelines 2020 (adults: about 1.0 g protein/kg body weight; carbohydrate 50–65% TEI; fat 25–30%; fibre 20–30 g/day); International Society of Sports Nutrition, 2026 Position Stand on Diets for Body Weight Reduction (general weight-loss protein guide about 1.2–1.6 g/kg/day) and Protein and Exercise Position Stand (about 1.4–2.0 g/kg/day for most exercising individuals). Goal-specific protein is capped in this calculator to keep room for a balanced carbohydrate and fat intake. Calculated values are estimates for general adult guidance.

What do these numbers look like in food?

Use familiar foods to make the daily targets easier to picture. These are examples, not foods you must eat.

Protein examples
Carbohydrate examples
Fibre examples
Approximate food values vary by variety, brand and preparation. Sources: Malaysian Food Composition Database — cooked rice, rolled oats, whole egg, guava; USDA FoodData Central values for cooked skinless chicken breast and cooked lentils. Values are rounded for consumer-friendly examples.

An example day based on your result

This example uses your calculated energy range and goal to suggest a practical meal structure. It is not a prescribed meal plan.

Your age, sex, height, weight and activity level affect your calorie estimate; your selected goal changes the portion emphasis shown here. Food choice itself does not need to differ simply because someone is male or female.
Meal structure reference: Ministry of Health Malaysia, Malaysian Dietary Guidelines 2020 and Malaysian Healthy Plate / Quarter-Quarter-Half. Portion examples are illustrative and should be adjusted for health conditions, allergies, food preferences and appetite.

Your entries stay in this browser and are not submitted to BIG Pharmacy by this calculator. WhatsApp opens only when you choose to contact the dietitian.

From resting needs to everyday energy

The calculator estimates resting energy with the Mifflin–St Jeor equation, then applies an activity factor to estimate total daily energy needs.

Start with resting energy

Your body uses energy even at rest for basic functions such as breathing, circulation and maintaining body temperature.

Add your activity

A lifestyle factor helps estimate the energy used across a typical day, including everyday movement and exercise.

Put it in goal context

Your goal shapes the planning range shown at the end. It is still an estimate, so real needs can differ from the calculator.

Resting energyMifflin–St Jeor estimate
×
ActivityTypical weekly lifestyle
=
Daily energyEstimated maintenance needs

Calories are only one part of the picture

A daily energy estimate can be useful, but healthy eating is also about the quality, balance and consistency of what you eat.

Build balanced meals

Include vegetables, a source of protein and sensible portions of carbohydrate-rich foods, while choosing minimally processed foods more often.

Think fibre & fullness

Fibre-rich foods such as vegetables, fruit, legumes and whole grains can support a balanced eating pattern and help with fullness.

Keep everyday habits in view

Movement, hydration, sleep, stress, medicines and health conditions can all influence weight, appetite and how you feel.

Explore weight & wellness with BIG

Use your calorie estimate alongside other useful health checks and practical everyday guidance.

Every BIG change starts small

Explore everyday wellness ideas, quick questions and support that can fit into your routine.

Explore weight & wellness →

Check your BMI too

Use BIG Pharmacy’s Malaysia BMI calculator to understand your BMI as another starting point for a health conversation.

Open the BMI calculator →

Calorie calculator questions, answered

What does “maintenance calories” mean?

Maintenance calories are an estimate of the daily energy intake that may keep your current body weight relatively stable over time. It is not an exact number because metabolism and everyday activity vary from person to person and from day to day.

How does this calorie calculator work?

It estimates resting energy using the Mifflin–St Jeor equation from your age, sex, height and weight, then multiplies that estimate by the activity level you select. Your goal is used to show a general planning range around that maintenance estimate.

Why does another calculator give me a different result?

Different calculators may use different equations, activity factors, rounding methods or goal adjustments. Even when the same formula is used, selecting a different activity level can change the estimate substantially.

Should I eat exactly the same number of calories every day?

No. This is a general estimate, not a daily prescription. Appetite and activity can vary, and your overall eating pattern matters more than hitting one number perfectly every day.

Can I use this calculator during pregnancy or breastfeeding?

This calculator does not provide a calorie target for pregnancy or breastfeeding because energy and nutrient needs change. Speak with a dietitian, doctor or maternity care professional for personalised guidance.

Who should get personalised advice before changing calorie intake?

Consider professional guidance if you are under 18, pregnant or breastfeeding, have a medical condition that affects nutrition or weight, take medicines that affect appetite or weight, have had an eating disorder, or are experiencing unexplained weight change.

Important: This calculator provides a general estimate for adults and is not medical advice, a diagnosis or a personalised diet prescription. Individual energy and nutrient needs can vary. If you have a health condition, unexplained weight change, a history of disordered eating, or specific nutrition needs, speak with a qualified healthcare professional or dietitian before making significant changes to your diet.