Heart Rate Zone Calculator

Measure your pulse first thing in the morning before getting out of bed. Count beats for 60 seconds, or 15 seconds and multiply by 4. Average several readings for accuracy.

Zone 2 (60-70% max HR) is often called the 'fat burn zone' because a higher percentage of calories come from fat. However, higher zones burn more total calories.

The Karvonen formula uses Heart Rate Reserve (Max HR - Resting HR) for more accurate zone calculation: Target HR = Resting HR + (HR Reserve × intensity %).

Yes, the Heart Rate Zone Calculator is 100% free to use with no limitations. There is no registration required, no daily usage caps, and no hidden fees. You can use it as many times as you need.

The Heart Rate Zone Calculator uses industry-standard formulas and algorithms to deliver reliable results. While the tool is designed for accuracy, results should be used as estimates and guidance. For critical decisions, always consult a qualified professional.

Yes, the Heart Rate Zone Calculator is fully responsive and works perfectly on smartphones, tablets, and desktop computers. Simply open NexTool in your mobile browser and navigate to the tool — no app download required.