Glossary
What are maintenance calories?
Updated 2026-08-16By Chris RichardsAll terms
Definition
Maintenance calories are the average daily intake that keeps body weight flat across several weeks. A calculator estimates them from TDEE; three weeks of logging and weigh-ins tells you whether the estimate was right.
Definition
Maintenance is the intake level at which energy in and energy out cancel, so the weight trend runs flat. It is a measured quantity rather than a calculated one: a calculator gives you a candidate, and a few weeks of logging tells you whether the candidate was right.
How to find yours, with numbers
Log honestly for three weeks without trying to change anything, and take the daily average — say it comes out at 2,180 calories. Now compare the first-week and third-week weight averages: 74.8 kg and 74.9 kg. That 0.1 kg is noise, so 2,180 is a fair read on maintenance.
If instead the average had fallen from 74.8 kg to 74.0 kg, you were not at maintenance — you were running a deficit at 2,180, and maintenance sits somewhere above it. Adjust, hold, and re-measure rather than recalculating.
The mistake people make
Treating maintenance as a permanent number. It moves with body weight, activity, and season — as body mass falls, expenditure falls with it, which is why models of energy balance predict weight change flattening out rather than continuing at a fixed rate. Expect to re-measure a few times a year.
The second error is measuring across too short a window. One week of weights is mostly water; three gives the trend room to show itself.
Related terms
Maintenance is the observed version of TDEE. Eat below it and you have a calorie deficit; the food diary and the weigh-in are the two instruments that let you find it at all.
FAQ
How do I calculate maintenance calories?
Start with a TDEE calculator (Mifflin-St Jeor times an activity factor), then verify with a three-week log. The calculator is the hypothesis; the scale is the answer.
How do I find my maintenance calories?
Log intake for three weeks without trying to change anything, weigh daily, and compare weekly averages. If weight is flat, that average intake is maintenance. If it drifts, adjust by about 200 calories and retest.
Why is my maintenance different from the calculator?
Because the calculator estimates activity from a dropdown and your body does not. Prediction equations carry meaningful individual error, so a gap of a few hundred calories between the estimate and your logged reality is ordinary, not a sign anything is broken.
Sources
- [1] Body Weight Planner — National Institute of Diabetes and Digestive and Kidney Diseases (NIH)
- [2] Hall KD, Sacks G, et al. “Quantification of the effect of energy imbalance on bodyweight” (2011) — The Lancet 378:826–837 (PMID 21872751)
General nutrition information, not medical advice. Calorie and macro targets are estimates — talk to a doctor or a registered dietitian before changing your diet, especially if you are pregnant, managing a health condition, or have a history of disordered eating.
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