How to Calculate Your Maintenance Calories

Start with an estimate, not an exact prescription

For an initial estimate, use Vitalo’s free calorie calculator and choose Maintain. Enter your age, weight, height, equation, and usual activity; the tool calculates a resting estimate and an estimated maintenance intake. The manual method follows below.

What are maintenance calories?

Maintenance is an energy balance over time, not a rule that weight must be identical every morning. When average intake broadly matches average energy use, body weight tends to remain stable. Daily maintenance calories are a planning estimate of that balance.

BMR, RMR, and TDEE describe different things. Many online tools call their resting estimate BMR, but the Mifflin–St Jeor equation predicts resting energy expenditure, not a laboratory measurement of basal metabolism.

How to calculate maintenance calories

You can calculate an initial estimate without a calculator: work out resting energy, choose an approximate activity multiplier, and multiply the two. A pen, paper, or ordinary calculator is enough for the arithmetic.

The simplified maintenance calorie formula is: TDEE ≈ estimated resting energy × activity multiplier. When people write BMR × activity factor, the resting value is often an RMR estimate in practice. Neither part measures your individual daily expenditure.

Step 1 — Estimate resting energy with Mifflin–St Jeor

Vitalo uses the following simplified Mifflin–St Jeor equations. The original research developed the equation in healthy adults; it is a population-based prediction, not a metabolic test. Choose the corresponding equation in the tool.

Male equation: resting energy (kcal/day) = 10 × W + 6.25 × H − 5 × A + 5.

Female equation: resting energy (kcal/day) = 10 × W + 6.25 × H − 5 × A − 161.

W is body weight in kilograms; H is height in centimetres; A is age in years. Convert pounds to kilograms by multiplying by 0.45359237, and total inches to centimetres by multiplying by 2.54. The sex-specific constants reflect the groups used to develop the equation and may not fit every individual; seek personalised guidance when needed.

Step 2 — Choose an approximate activity level

Choose a description of an ordinary week, including your work, walking, household movement, and exercise—not your hardest workout. These are the four factors offered by Vitalo, not laboratory measurements or coefficients established by the original Mifflin study.

Training frequency alone cannot identify the correct factor. A seated job with a few gym visits can differ from a physically demanding job with similar workouts. If you are unsure, choose a reasonable starting assumption and keep a note of it for later comparison.

Step 3 — Estimate TDEE, then round sensibly

Multiply the resting estimate by your selected factor. The factor is intended to approximate total daily needs, including usual movement and food digestion. Do not automatically add a separate digestion allowance or every exercise calorie on top.

Treat the result as a daily average rather than an exact allowance for each day. A display of 2,720 kcal does not mean your needs are known to the nearest calorie. Calories in this guide mean kilocalories (kcal); Australian labels commonly use kilojoules (kJ). Multiply kcal by 4.184 to convert units, not to make the estimate more precise.

Maintenance calories calculation example

Assume an adult aged 35, weighing 80 kg and measuring 180 cm, using the male equation and the Moderately active factor of 1.55. These are illustrative inputs, not a recommendation for someone else with the same weight.

Resting estimate = (10 × 80) + (6.25 × 180) − (5 × 35) + 5 = 800 + 1,125 − 175 + 5 = 1,755 kcal/day.

Estimated TDEE = 1,755 × 1.55 = 2,720.25 kcal/day, displayed as about 2,720 kcal/day. With the same inputs and the Lightly active factor of 1.375, the result is about 2,413 kcal/day. That difference shows why the activity assumption needs checking.

How to find your actual maintenance calories

If food and weight tracking are appropriate for you, compare your estimate with a repeatable record over several weeks. Two to four weeks can be a useful initial observation window, not a validated deadline for discovering an exact requirement. A changing routine or fluid shifts may require longer.

If you already weigh frequently and it feels comfortable, compare weekly averages from readings taken under similar conditions. Daily weighing is not required: NHS guidance describes consistent weekly to monthly measurements. Use the same scales, location, clothing, and time of day where practical.

If comparable weight trends remain broadly stable, your recorded average intake may be a useful approximation of current maintenance. It is not proof of exact energy expenditure: unrecorded food, portion errors, and changes in body composition can complicate the picture.

• Record ordinary meals consistently, including oils, sauces, drinks, snacks, and weekend intake. Mark uncertain meals rather than pretending they are exact.
• Keep activity reasonably consistent and note unusual travel, illness, training, or routine changes.
• Compare the same kinds of periods: a full week of intake with a full week of observations, not a weekday-only log against a weekend weigh-in.
• Review the direction over time before changing the estimate. Stop tracking and seek support if it increases anxiety or restrictive behaviour.

Read the weight trend before adjusting

Water, digestive contents, and other short-term influences can move the scale without showing a change in body fat. For example, weekly means of 80.2, 80.1, and 80.2 kg alongside a fairly consistent intake are more informative than one unusually high reading. These numbers do not define a normal fluctuation for everyone.

If a trend repeatedly rises or falls and your goal is maintenance, first check recording gaps and activity assumptions. If appropriate, make one modest intake or activity adjustment rather than a large cut, keep the method consistent, and observe again over a comparable period. No single adjustment size or timetable fits everyone.

A calculator cannot tell you whether an unexplained change is medical. Persistent unexpected weight change, swelling, or concerning symptoms deserve professional advice rather than repeated calorie adjustments.

Understand why weight fluctuates from day to day →

Why your maintenance calories can change

Maintenance is not a permanent personal setting. Body size and body composition affect resting needs; daily movement and exercise affect total expenditure. Age, health, and changes in routine add context, and people with identical equation inputs can still differ.

Revisit the estimate after a meaningful change in weight, training, work, or mobility—not automatically after each birthday or individual weigh-in. More muscle does not create a precise calorie bonus that this equation can calculate.

• Body weight and composition: a changed body may have different energy needs.
• Daily movement: walking, standing, commuting, and household tasks count too.
• Training: duration, intensity, and recovery periods alter the overall routine.
• Age and health: changing needs may call for individual assessment.
• Individual variation: an equation cannot capture every difference in physiology or behaviour.

Common maintenance calorie mistakes

Avoid double-counting exercise. An activity multiplier already represents some movement. Adding every workout estimate on top can count the same activity twice. Before combining a calculator and a wearable, check whether both estimates include routine exercise.

Write one simple description of the method you are using: a total daily estimate based on usual activity, or a professionally guided approach that considers activity separately. Keep the method consistent when reviewing your record.

• Treating an equation result as exact rather than a starting estimate.
• Choosing a high multiplier from workout frequency while ignoring a mostly seated day.
• Missing weekend meals, drinks, cooking oil, or changes in portion size.
• Reacting to one day’s scale reading or making adjustments too frequently.
• Mixing kJ and kcal, or raw food weights with cooked-food nutrition entries.

How accurate are maintenance calorie estimates?

A systematic review found Mifflin–St Jeor comparatively reliable among common resting-energy equations, but substantial individual errors remained. That finding does not make your TDEE accurate to within 10%: the activity multiplier adds a separate source of uncertainty.

Resting metabolism can be measured with indirect calorimetry when clinically appropriate. A home log instead helps test whether an estimate is practically useful. Neither logging for a few days nor averaging calculator results directly measures total energy expenditure.

Use individual guidance when the context calls for it

Standard adult estimates are not intended to set calorie targets for children or teenagers, pregnancy, breastfeeding, eating-disorder care, or therapeutic diets. Some illnesses, medicines, and athletic circumstances also need an individual approach.

NIDDK’s Body Weight Planner is a separate tool for adults aged 18 and over, not for people who are pregnant or breastfeeding. Its dynamic planning approach is not the same as Vitalo’s simplified resting-energy-times-activity calculation. Neither replaces care from a clinician or Accredited Practising Dietitian when needed.

Calculate your maintenance calories with Vitalo

Choose Maintain in the free calorie calculator to see its estimated maintenance intake without a weight-loss or weight-gain adjustment. The resting estimate and maintenance estimate are shown separately so you can see what was calculated.

Keep a note of the inputs and the activity assumption. The calculation runs in your browser without an account; it does not measure your metabolism, assess your medical history, or verify your food log. Treat it as the beginning of the process described above.

Turn the calorie estimate into practical meals

Once you have an appropriate daily calorie target, the macro calculator converts your chosen protein and fat percentages into grams and assigns the remaining share to carbohydrate. It does not decide whether the target or macro split suits you.

For homemade meals, count the ingredients and servings consistently. Keep uncertain portions visible in your record rather than using extra decimal places to suggest accuracy.

Calculate calories and macros per recipe serving →

Consider protein separately from total calories

A calorie target does not tell you how much protein you need. Vitalo’s protein calculator compares goal-based daily ranges; those are planning estimates for healthy, active adults, not personalised dietary prescriptions.

After choosing a suitable daily protein target, the meal-distribution guide shows flexible ways to share it across meals. You do not need every meal to contain the same amount.

Plan protein across the meals you actually eat →

Keep the next step appropriate to your goal

Finding maintenance is not a reason to start a calorie deficit. If weight management is an appropriate goal for you, read the separate guide to realistic, sustainable changes rather than treating the maintenance number as a weight-loss prescription.

Read Vitalo’s guide to safe, sustainable weight management →

Check which Vitalo app features are available

If keeping food and progress records would help, visit Vitalo’s download page for current app availability. The website calculators are already available independently. Do not assume an app download or a feature is available until it is listed there.

Check Vitalo app availability →