Maintenance calories are an estimate of energy intake that would maintain body mass over time under a given activity pattern. This page provides a definition and practical context; it is not an individualized medical or nutrition prescription. Use the related tools and guides for calculations or programming decisions rather than treating a glossary definition as a result.
Estimate your own starting point with the TDEE and calorie calculator, then build a small, deliberate surplus with the lean bulk calculator if muscle gain is the goal.
Maintenance calories are simply the point where intake matches TDEE, which means the number moves whenever TDEE does: as bodyweight, activity level, or training volume change, so does maintenance. Athletes cutting or bulking commonly use maintenance as the reference point they are deliberately offsetting from, either down (a caloric deficit) or up (a calorie surplus), but even someone actively trying to hold a stable weight needs to recheck maintenance periodically, since a number that was accurate three months ago can be meaningfully off after a body-composition change.
Practical application in training
When establishing a baseline, track daily body weight and caloric intake for two consecutive weeks. If average weight remains unchanged, your average caloric intake equals true maintenance. Use this value as the anchor when adjusting calories for strength, performance, or body composition phases.