Calculate your maximum heart rate and training zones using your age and resting heart rate.
Providing RHR enables the Karvonen Formula for higher accuracy.
Your Heart Rate Profile
Max Heart Rate— bpm
Method Used—
Training Zones
Zone
Intensity
Heart Rate Range (bpm)
Benefit
Understanding Heart Rate Zones
Training effectively requires monitoring the intensity of your exercise. Heart rate zones provide a scientifically based framework to gauge effort levels, ensuring you aren't training too hard or too easy for your specific goals. By exercising in different zones, you trigger specific physiological adaptations.
How the Calculation Works
This calculator utilizes two primary methods depending on the data you provide:
Standard Max HR Method (Fox Formula): This is the simplest estimation, calculated as 220 - Age. The zones are then simple percentages of this maximum. It is a good starting point for beginners.
Karvonen Formula (Heart Rate Reserve): If you input your Resting Heart Rate (RHR), the calculator uses the Karvonen method. This is generally considered more accurate for individuals with varying fitness levels because it accounts for your "Heart Rate Reserve" (the difference between your Max HR and Resting HR).
The 5 Heart Rate Zones Explained
Zone 1: Very Light (50-60%)
Feeling: Very easy, conversational pace. Benefit: Improves overall health, aids recovery, and helps with warm-up and cool-down. Useful for "active recovery" days.
Zone 2: Light (60-70%)
Feeling: Comfortable, can maintain a conversation but breathing is rhythmic. Benefit: Improves basic endurance and fat burning. This is the foundation of cardiovascular fitness and increases the body's efficiency at using fat for fuel.
Zone 3: Moderate (70-80%)
Feeling: Moderate effort, harder to hold a conversation, sweating begins. Benefit: Improves aerobic fitness and blood circulation in skeletal muscles. This is effectively the "aerobic zone" where you build the engine to run or cycle faster for longer.
Zone 4: Hard (80-90%)
Feeling: Hard, heavy breathing, can only speak in short phrases. Benefit: Increases maximum performance capacity and lactate threshold. This trains your body to sustain high speeds and tolerate higher levels of lactic acid.
Zone 5: Maximum (90-100%)
Feeling: Very hard, gasping for breath, cannot talk. Benefit: Develops maximum performance and speed (VO2 Max). This zone is usually sustained for very short intervals (sprints) to improve neuromuscular coordination and top-end speed.
When to Re-calculate
You should recalculate your zones if:
You have a birthday (Age changes Max HR).
Your fitness improves significantly (Resting Heart Rate usually drops).
You have not trained for a long period (Resting Heart Rate may rise).