The Resting Heart Rate Calculator measures how many times your heart beats per minute while you are at complete rest. It is calculated using the formula RHR = (Heartbeats ÷ Time) × 60, where heartbeats are counted during a specific number of seconds, usually 15, 30, or 60 seconds. A normal resting heart rate for adults ranges from 60 to 100 beats per minute, and lower values often indicate better cardiovascular fitness and heart efficiency. This calculator helps users monitor their heart health, track improvements from regular exercise, and identify potential abnormalities that may require medical attention.