Energy Balance
Maintenance Calorie Calculator
Estimate daily maintenance calories (TDEE at net energy balance) using Mifflin-St Jeor BMR with activity factor multipliers. The baseline for all calorie planning — confirmed when weight trend is stable under consistent intake. Foundation for fat loss and lean bulk targets.
System Units
Awaiting Calculator Inputs
Fill in the fields above and hit Calculate to generate your body composition targets.
Formula & Math
Uses BMR multiplied by an activity factor to estimate maintenance calories.
How to Interpret
Maintenance is confirmed when body weight trend is stable under consistent intake.
Plan Integration
Take these estimations back to the main Strategy Finder assessment, or save them in your tracking logs in the local dashboard.
Maintenance Calories: Establishing Energy Balance
Science & physiological analysis for strategy selection
Reviewed by Divy Yadav, CSCS
Last updated: June 27, 2026 · BodyCompOS Editorial Board
Maintenance calories represent the net energy balance where calories consumed equal calories burned. In this state, body weight remains stable. Establishing your maintenance level is the critical first step before calculating cutting deficits or bulking surpluses. The BodyCompOS Maintenance Calorie Calculator integrates your sex, age, height, and weight to calculate your resting metabolic rate (BMR), and then scales it using activity multipliers to estimate your baseline maintenance requirements.
1. How to Use & Apply This Target
Input your personal stats and select your typical daily activity level. Treat this calculated output as an initial estimate. Track your food intake and morning weight for 3 weeks to confirm this value. If your average weight remains stable, your intake matches your actual maintenance. Use this value as the baseline for deficit or surplus planning.
2. Mathematical Assumptions & Formula Logic
This calculator uses the Mifflin-St Jeor equation to estimate resting metabolic rate: `BMR = 10 * Weight (kg) + 6.25 * Height (cm) - 5 * Age (y) + s` (where `s` is +5 for men and -161 for women). The resulting BMR is multiplied by activity factors (1.2 to 1.9) representing daily activity levels.
3. Step-by-Step Worked Mathematical Example
Frequently Asked Questions
Q:How do I know if my maintenance estimate is too high?
If you consume the calculated maintenance calories for 2 to 3 weeks and your body weight consistently increases, your actual maintenance level is lower than the estimate. This is common in individuals with low daily step counts or lower muscle mass than average.
Q:Does thyroid function affect my maintenance?
Yes. Thyroid hormones (specifically T3 and T4) regulate mitochondrial respiration and basal metabolic rate. If you have diagnosed thyroid dysfunction (such as hypothyroidism), your actual BMR may be 10-20% lower than predictive equations estimate. Consult your physician in such cases.
Related Strategy Tools
TDEE Calculator
Estimate Total Daily Energy Expenditure and maintenance calories using Mifflin-St Jeor BMR, refined with Katch-McArdle when body fat is available. Activity multipliers range from sedentary (1.2) to competitive (1.9). TDEE is the foundation for calorie planning, fat loss, and lean bulk targets.
Calorie Calculator
Calculate daily calorie targets for fat loss (cutting at 85% TDEE), lean bulk (108%), aggressive bulk (115%), or recomposition (98%). Conservative multipliers optimize fat mobilization while preserving muscle mass. A practical starting point for body composition strategy planning.
BMR Calculator
Calculate Basal Metabolic Rate (BMR), the calories burned at complete rest. Uses Mifflin-St Jeor by default; Katch-McArdle when body fat is available. BMR accounts for 60-70% of TDEE and serves as the resting baseline for all calorie planning.