What Are Maintenance Calories?

Maintenance calories approximate the daily intake where weight stays relatively stable over weeks. In practice, this is the same concept as TDEE (Total Daily Energy Expenditure) — the calories your body uses across a full day including rest, digestion, and movement.

The Maintenance Formula

Maintenance = BMR × activity factor

TDEE = BMR × activity factor

Activity factors:
  Sedentary        1.2
  Lightly Active   1.375
  Moderately Active 1.55
  Very Active      1.725
  Extra Active     1.9
BMR
Basal metabolic rate (kcal/day)
factor
Activity multiplier from quiz or self-assessment

BMR from Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle.

How This Calculator Works

1

Inputs

Age, sex, size, activity

2

Estimate

BMR × activity + range

3

Verify

Optional adaptive data

4

Calibrate

3-week weight trend

Activity Levels Decoded

If you are between two levels, choose the lower one first. Take the Activity Level Quiz if unsure.

Level

Sedentary

Factor

1.2

Practical cue

Desk job, little exercise

Level

Lightly Active

Factor

1.375

Practical cue

Light exercise 1–3 days/week

Level

Moderately Active

Factor

1.55

Practical cue

Moderate training 3–5 days/week

Level

Very Active

Factor

1.725

Practical cue

Hard training most days

Level

Extra Active

Factor

1.9

Practical cue

Physical job + high training

NEAT: The Hidden Variable

Non-Exercise Activity Thermogenesis (NEAT) — fidgeting, walking, standing, chores — can differ by hundreds of calories between two people with the same gym schedule.

Profile

Desk job, 3 gym days, low steps

NEAT level

Low

Likely multiplier

Lightly Active (1.375)

Profile

Retail worker, no gym, on feet all day

NEAT level

High

Likely multiplier

Moderately Active (1.55+)

Profile

Remote worker, 5 hard training days

NEAT level

Moderate

Likely multiplier

Moderately to Very Active

Verify With Your Own Data

Switch to Verify with data mode to reverse-calculate maintenance from average daily calories and weight trend. Use signed weight change: end 7-day average minus start 7-day average (negative = loss). The formula uses a planning heuristic of ~7,700 kcal per kg of tissue change — not a precise physical constant: maintenance ≈ avg intake − (weekly weight change × 7,700 / 7). After 21+ days of consistent tracking, this adaptive estimate may better reflect your recent intake and weight trend for personal journaling than formula-only numbers.

Worked Example

Example: 28-year-old woman, moderately active

BMR ≈ 1,400 kcal (Mifflin-St Jeor), activity factor 1.55.

  1. Maintenance = 1,400 × 1.55 = 2,170 kcal/day
  2. Practical range (±10%): ~1,950–2,390 kcal/day

Result: Eat near 2,170 kcal/day for 2–3 weeks and compare weight trend.

3-Week Calibration Protocol

Formulas give you a starting point. Your scale trend over 2–3 weeks is the best feedback loop for finding your real maintenance calories.

  1. Week 1: Eat at your estimated maintenance (or goal calories) as consistently as practical. Weigh yourself daily at the same time, same conditions.
  2. Week 2: Calculate your weekly average weight. Compare to the prior week. Ignore day-to-day swings from sodium, hydration, or training soreness.
  3. Week 3: If weight is stable (±0.5 lb / ~0.2 kg), your intake is likely near maintenance. If trending up or down, adjust by 100–200 kcal/day and repeat.

Accuracy Layers

TDEE estimate error comes from two stacked layers — and the second is usually bigger in practice.

Layer 1: BMR formula error

Mifflin-St Jeor predicts resting metabolic rate within ~10% for roughly 82% of non-obese adults and ~70% of obese adults (Frankenfield et al., 2005). That is ±150–200 kcal for many people.

Layer 2: Activity multiplier error

Picking one activity bucket too high adds ~200–400 kcal/day. Most people remember gym time but underestimate desk hours. Take our Activity Level Quiz if unsure.

Myths vs Facts

Myth

Maintenance is one exact number you find once.

Evidence-based view

It shifts with weight, activity, NEAT, and seasons. Recalculate when your routine changes.

Myth

If the calculator says 2,200, eating 2,200 guarantees no weight change.

Evidence-based view

Individual variation means you may need 100–200 kcal above or below. Use trends, not one day.

Myth

Gym days alone determine your activity level.

Evidence-based view

Job, steps, and NEAT often matter more than 3–4 hours of training per week.

Myth

Maintenance and TDEE are different concepts.

Evidence-based view

For practical planning, they refer to the same estimated daily energy expenditure.

Safety & Limitations

Suggested next steps

Activity Level Quiz

Structured multiplier recommendation

Deficit Calculator

Compare deficit options from maintenance

Full TDEE Calculator

Maintenance plus goal and macros

Research & References

Each citation below supports a specific claim on this page. We explain relevance so you can verify the science yourself.

  1. National Academies of Sciences, Engineering, and Medicine — Factors Affecting Energy Expenditure and Requirements. Dietary Reference Intakes for Energy — NCBI Bookshelf, 2023.Defines TDEE components (REE, TEF, PAEE) and explains why population equations cannot capture individual metabolic variation.
  2. Mifflin MD, St Jeor ST, Hill LA, Scott BJ, Daugherty SA, Koh YO — A new predictive equation for resting energy expenditure in healthy individuals. Am J Clin Nutr. 1990;51(2):241-247, 1990.DOI: 10.1093/ajcn/51.2.241Primary source for the Mifflin-St Jeor BMR equation used as the default in this calculator.
  3. Roza AM, Shizgal HM — The Harris Benedict equation reevaluated: resting energy requirements and the body cell mass. Am J Clin Nutr. 1984;40(1):168-182, 1984.DOI: 10.1093/ajcn/40.1.168Source for the revised Harris-Benedict coefficients offered as a comparison formula.
  4. McArdle WD, Katch FI, Katch VL — Exercise Physiology: Energy, Nutrition, and Human Performance. Lippincott Williams & Wilkins, 7th edition, 2010.Textbook reference for the lean-body-mass-based Katch-McArdle resting energy estimate.
  5. Frankenfield D, Roth-Yousey L, Compher C — Comparison of Predictive Equations for Resting Metabolic Rate in Healthy Nonobese and Obese Adults. J Am Diet Assoc. 2005;105(5):775-789, 2005.DOI: 10.1016/j.jada.2005.02.005Meta-analysis showing Mifflin-St Jeor within ~10% of measured RMR for ~82% of non-obese and ~70% of obese adults — supports honest accuracy framing.
  6. Hall KD, Sacks G, Chandramohan D, et al. — Predicting the weight-loss plateau: a mathematical model of human energy balance. PLoS Comput Biol. 2011;7(7):e1002155, 2011.DOI: 10.1371/journal.pcbi.1002155Shows weight change is non-linear over time — supports labeling the 3,500 kcal/lb rule as a rough heuristic, not a law.
  7. Dhurandhar NV, Schoeller D, Brown AW, et al. — Reported vs. actual energy intake and energy expenditure assessment. Int J Obes (Lond). 2015;39(8):1181-1185, 2015.DOI: 10.1038/ijo.2015.78Documents systematic overreporting of exercise and underreporting of food — supports activity-level conservatism guidance.

Frequently Asked Questions

Common questions about the maintenance calorie calculator.