Heart Rate Zone Calculator
Find your 5 training zones for fat burning, cardio and peak performance.
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📘 What is the Heart Rate Zone Calculator?
Training at the wrong heart rate intensity wastes effort — too easy and you barely stimulate adaptation, too hard and you cannot sustain it long enough to build real fitness. This calculator gives you all five training zones, calculated from your actual resting heart rate, not just a generic age-based estimate.
⚙️ How Heart Rate Zones is calculated
Maximum heart rate estimate
This calculator uses the widely used 220 minus age formula for estimated maximum heart rate. It is a population-level estimate with real individual variation, so treat it as a reasonable starting point rather than a lab-tested exact figure.
Heart rate reserve (the Karvonen method)
Rather than applying zone percentages directly to your max heart rate, this calculator uses heart rate reserve — the gap between your max and resting heart rate — which produces more individually accurate zones, especially if your resting heart rate is notably low or high.
The five zones explained
Zone 1 (50–60%) is recovery pace. Zone 2 (60–70%) builds aerobic base. Zone 3 (70–80%) is comfortably hard cardio. Zone 4 (80–90%) is lactate threshold work. Zone 5 (90–100%) is maximum effort, sustainable only briefly.
Karvonen method
Target HR = resting HR + (zone % × heart rate reserve)
Heart rate reserve = max HR − resting HR
🧮 Worked examples
Example — 30-year-old, resting HR 65
Max HR = 220 − 30 = 190. Heart rate reserve = 190 − 65 = 125.
→ Zone 2 (fat burn, 60–70%) = 140–152 bpm
Example — same age, lower resting HR of 55
A fitter individual with a resting HR of 55 instead of 65.
→ Zone 2 shifts down slightly to about 136–149 bpm — fitness level changes your personal zones
💡 Original insights & how to use this calculator
Why most training should happen in Zone 2
Research on elite endurance athletes consistently shows roughly 75–80% of total training volume happens at low intensity (Zone 1–2). For recreational exercisers, building a base of mostly Zone 2 work with one higher-intensity session per week tends to outperform constant moderate-intensity training.
Using zones for fat loss vs performance goals
Zone 2 is generally most efficient for sustainable fat-burning sessions, while Zone 4–5 intervals drive the largest cardiovascular fitness gains in the least total time — choose based on your specific goal, not just "more is better."
Recalculating as fitness improves
Resting heart rate typically drops as cardiovascular fitness improves, which shifts your zones lower over time. Recalculate every few months rather than training to zones calculated when you were less fit.
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💡 Expert tips
Zone 2 burns the most fat per calorie.
A resting HR below 60 bpm indicates good cardiovascular fitness.
📖 Learn more on WellFiLab
Visit ↗❓ Common questions
What is max heart rate?
220 minus your age is the standard estimate. Individual variation is ±10–20 bpm.
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