Heart Rate Zone Calculator
Find your 5 personalized training zones using age and resting heart rate. Train smarter with science-backed intensity targets.
đ¯ Your 5 Heart Rate Training Zones
How to Use This Calculator
Enter your age in years. The calculator uses this to estimate your maximum heart rate (220 â age).
Measure and enter your resting heart rate (RHR) in beats per minute. The best time to measure is immediately after waking, before getting up.
Select your preferred method: Karvonen (uses your RHR for more personalized zones) or Simple % of Max HR (a quick general estimate).
Press Calculate or hit Enter. Your 5 training zones appear instantly, each with a BPM range and training description.
Note your zones and reference them during workouts using a heart rate monitor, smartwatch, or fitness tracker.
Recalculate anytime â as your fitness improves, your resting heart rate typically decreases, shifting your zones slightly.
Key Features
Karvonen Formula
Uses Heart Rate Reserve for personalized zone targets â more accurate than simple percentage methods.
Instant Results
All 5 zones calculated in real-time, client-side. No page reload, no server dependency.
5 Training Zones
Full breakdown from Zone 1 (warm-up) through Zone 5 (maximum effort) with BPM ranges and usage tips.
Mobile Friendly
Fully responsive design â works on any smartphone, tablet, or desktop with no app download needed.
100% Private
No data is sent to any server. All calculations happen entirely within your browser.
Two Methods
Switch between the Karvonen and Simple % methods to compare results and choose what suits your training style.
Formula & How It Works
Step 1 â Estimated Maximum Heart Rate
Max HR = 220 â AgeStep 2A â Karvonen Formula (Recommended)
Heart Rate Reserve (HRR) = Max HR â Resting HR
Target HR = Resting HR + (HRR Ã Zone %)Step 2B â Simple % of Max HR
Target HR = Max HR Ã Zone %| Zone | Name | % of Max HR | Primary Benefit |
|---|---|---|---|
| Zone 1 | Warm-Up | 50â60% | Recovery, blood flow |
| Zone 2 | Fat Burn | 60â70% | Aerobic base, fat oxidation |
| Zone 3 | Aerobic | 70â80% | Cardiovascular endurance |
| Zone 4 | Threshold | 80â90% | Lactate threshold, speed |
| Zone 5 | Peak / VO2 Max | 90â100% | Maximum performance |
The Karvonen method adjusts these percentages to your individual HRR, resulting in zones that are typically 2â5 BPM higher than simple % calculations for a well-trained individual with a lower resting HR.
Practical Examples
đŽđŗ Example 1 â Priya, 28, Mumbai (Recreational Runner)
Priya is a 28-year-old recreational runner with a resting HR of 68 BPM. She uses the Karvonen method to plan her weekend long run pace.
Zone 2 (Fat Burn): 68 + (124 Ã 0.60) to 68 + (124 Ã 0.70) = 142â155 BPM
She keeps her long runs in this zone to build endurance without burnout.
đŽđŗ Example 2 â Rakesh, 45, Delhi (Corporate Professional, Gym Beginner)
Rakesh is 45 years old, sedentary, with a resting HR of 78 BPM. His doctor recommends starting with low-intensity exercise.
Zone 1 (Warm-Up): 78 + (97 Ã 0.50) to 78 + (97 Ã 0.60) = 126â136 BPM
He targets this zone on the treadmill â safe, sustainable cardio for beginners.
đŦđ§ Example 3 â James, 35, London (HIIT Enthusiast)
James is a 35-year-old fitness enthusiast with a resting HR of 55 BPM due to consistent training. He does HIIT three times per week.
Zone 4 (Threshold): 55 + (130 Ã 0.80) to 55 + (130 Ã 0.90) = 159â172 BPM
Zone 5 (Peak): 172â185 BPM â his HIIT intervals hit Zone 4â5 for 20â40 seconds with Zone 1â2 recovery.
đŽđŗ Example 4 â Anita, 55, Bengaluru (Yoga Practitioner, Light Cardio)
Anita is 55, practices yoga daily, and wants to add light walking. Her resting HR is 70 BPM.
Zone 1: 70 + (95 Ã 0.50) to 70 + (95 Ã 0.60) = 118â127 BPM
A brisk 30-minute walk keeps her comfortably in Zone 1â2 â ideal for cardiovascular health maintenance.
What Is a Heart Rate Zone Calculator?
A heart rate zone calculator determines the specific beats-per-minute (BPM) ranges that correspond to different exercise intensities for your body. Rather than training at a vague "moderate" effort, heart rate zones give you objective, measurable intensity targets based on your physiology.
There are 5 commonly used heart rate zones, each associated with a different physiological response. Zone 1 is very light activity primarily used for warm-up and recovery. Zone 2 is the aerobic fat-burning zone most beneficial for base endurance. Zone 3 covers moderate aerobic work, Zone 4 targets your lactate threshold to improve speed and stamina, and Zone 5 represents near-maximal effort used in sprint intervals.
The Karvonen formula â the gold standard used by coaches and sports scientists â personalises these zones by accounting for your resting heart rate, not just your age. Two people of the same age with different resting heart rates will have meaningfully different training zones, and the Karvonen method captures this difference accurately.
Understanding and applying your zones helps you avoid overtraining, ensures recovery days are truly easy, and makes hard sessions genuinely hard. This concept is central to polarised training, 80/20 endurance training, and structured programs used by competitive athletes worldwide.
Want a deeper guide on heart rate zones, training methods, and how to apply zones in real workout plans?
đ Read the Full Guide on Heart Rate Zone Training âFrequently Asked Questions
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