Resting Calories

Resting calories is an everyday term that essentially means the same as BMR, or basal metabolic rate. It refers to the amount of energy your body burns per day just to maintain basic life functions: breathing, heartbeat, cell renewal, and body temperature regulation. Typically, a woman's resting calories are 1200-1600 kcal and a man's 1500-1900 kcal per day.

Resting calories are affected by the same factors as BMR: age, sex, height, weight, and especially muscle mass. Each decade after age 30 reduces resting calories by approximately 2-3%, unless muscle mass is actively maintained. This explains why weight management becomes harder with age - the body simply burns less energy.

For weight management, knowing your resting calories is critically important because they set the lower limit for how little you can safely eat. Eating below resting calories long-term leads to serious problems: metabolism slows dramatically (metabolic adaptation), muscle mass is lost, hormone function is disrupted, hair may thin, menstruation may stop, and immune function weakens.

Practical tip: you can roughly estimate your resting calories by multiplying your weight by 22 (women) or 24 (men). For a more accurate estimate, use online calculators. Make sure the calorie deficit is calculated from TDEE, not by going below resting calories. Resting calories are directly related to BMR, metabolism, and calorie deficit concepts.

Last updated: March 30, 2026