Use this free resting metabolic rate calculator to estimate calories burned at rest. Includes the Mifflin-St Jeor formula, benchmarks, and tips to boost RMR.
Frequently Asked Questions
What is resting metabolic rate?
Resting metabolic rate (RMR) is the number of calories your body burns at complete rest to maintain basic functions — breathing, circulation, temperature regulation, and cellular repair. It accounts for 60–75% of your total daily energy expenditure.
What is the difference between RMR and BMR?
BMR (Basal Metabolic Rate) is measured under strictly controlled clinical conditions after a 12-hour fast in a darkened, temperature-controlled room. RMR is measured at rest without those strict requirements, making it 10–20% higher than BMR. For practical nutrition planning, the two terms are effectively interchangeable.
What is a normal resting metabolic rate?
A typical adult RMR is 1,200–1,500 calories per day for women and 1,500–1,800 calories per day for men. Values vary significantly with body size, age, and muscle mass — a heavier, more muscular person will have a substantially higher RMR than a lighter, more sedentary individual.
How accurate are online RMR calculators?
Standard prediction equations are accurate within roughly ±10–15% for most adults. A 2014 meta-analysis of 197 studies found common formulas overestimate RMR by approximately 10% for men and 15% for women. For greater precision, indirect calorimetry at a sports performance lab is the gold standard.
How can I increase my resting metabolic rate?
The most effective strategies are building lean muscle mass through resistance training, maintaining adequate protein intake (1.6–2.2 g per kg of body weight), protecting sleep quality (7–9 hours), avoiding prolonged aggressive calorie restriction, and increasing daily movement through NEAT activities.