ChatGPT said:

The Maintenance Calorie Calculator estimates how many calories your body needs each day to maintain your current weight. It first calculates your Basal Metabolic Rate (BMR) — the energy your body uses at rest — using the Mifflin–St Jeor equation. Then it multiplies that number by an activity factor based on how active you are to determine your Total Daily Energy Expenditure (TDEE). This result gives you an approximate daily calorie target to stay at your current weight. Individual needs can vary due to metabolism, body composition, and lifestyle, so it’s best used as a general guideline.