Heart Rate Zone Calculator | 5 Training Zones
Calculate all 5 heart rate training zones using Max HR % or Karvonen method. Supports Standard, Tanaka, and Gellish formulas with visual zone bar chart.
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What Is the Heart Rate Zone Calculator | 5 Training Zones?
Heart rate training zones are ranges of beats per minute (bpm) that correspond to different exercise intensities. By training in specific zones, athletes can target different physiological adaptations, from fat burning and aerobic base building in Zone 2, to lactate threshold work in Zone 4, to peak power in Zone 5.
Two Calculation Methods
- • Max HR % Method: zones are simple percentages of your estimated maximum heart rate. Simple but does not account for individual fitness level.
- • Karvonen Method: uses Heart Rate Reserve (HRR = Max HR - Resting HR). More personalized, a fit person with low resting HR will have different zones than a sedentary person of the same age.
Three Max HR Formulas
- • Standard (220 - age): the most widely used formula, simple but has ±10-15 bpm standard deviation.
- • Tanaka (208 - 0.7 x age): based on a 2001 meta-analysis of 351 studies; more accurate for older adults.
- • Gellish (207 - 0.7 x age): from a 2007 study; gives nearly identical results to Tanaka.
Which Method Should I Use?
For beginners, the standard Max HR % method with the standard formula is a good starting point. For more personalized zones, especially if you know your resting heart rate from a fitness tracker, use the Karvonen method with the Tanaka formula, which is more evidence-based.
Formula
How to Use
- 1Select a calculation method: Max HR % (simple) or Karvonen (personalized with resting HR).
- 2Choose your Max HR formula: Standard (220-age), Tanaka (208-0.7×age), or Gellish (207-0.7×age).
- 3Use a preset (Beginner, Athlete, Senior, Weight loss) to autofill a common scenario.
- 4Enter your age in years. For the Karvonen method, also enter your resting heart rate.
- 5Measure resting HR by counting beats for 60 seconds after waking, before getting out of bed.
- 6Press Calculate (or Enter) to see all 5 zones with BPM ranges and training descriptions.
- 7Review the visual bar chart to see how the zones span your full heart rate range.
- 8Expand Step-by-step working to see the full Max HR and zone calculations with substituted values.
Example Calculation
Max HR = 220 - 30 = 190 bpm.
Zone 1: 95–114 bpm • Zone 2: 114–133 bpm • Zone 3: 133–152 bpm • Zone 4: 152–171 bpm • Zone 5: 171–190 bpm.
A beginner should spend most time in Zones 1–2 to build aerobic base without risk of injury.
Max HR (Tanaka) = 208 - 0.7 × 25 = 190.5 ≈ 191 bpm. HRR = 191 - 50 = 141 bpm.
Zone 2: 50 + 141 × 0.60 = 135 bpm to 50 + 141 × 0.70 = 149 bpm.
The Karvonen zones are shifted upward for a fit athlete compared to the simple Max HR % method.
Max HR (Gellish) = 207 - 0.7 × 60 = 165 bpm. HRR = 165 - 65 = 100 bpm.
Zone 2: 65 + 100 × 0.60 = 125 bpm to 65 + 100 × 0.70 = 135 bpm.
Seniors should focus on Zones 2–3 for cardiovascular health with manageable exertion.
Understanding Heart Rate Zone | 5 Training Zones
This calculator runs entirely in your browser, no data is sent to any server. Zone calculations use the standard 5-zone model based on percentages of maximum heart rate, with the Karvonen method available for more personalized results using heart rate reserve.
Training Recommendations by Zone
- • Zone 1 (50–60%): 20–40% of weekly training time. Recovery runs, easy walks, warm-up and cool-down.
- • Zone 2 (60–70%): 40–60% of weekly training. The foundation of aerobic fitness and fat oxidation.
- • Zone 3 (70–80%): 10–20% of weekly training. Tempo runs, aerobic development, sustainable effort.
- • Zone 4 (80–90%): 5–10% of weekly training. Lactate threshold intervals, race-pace training.
- • Zone 5 (90–100%): 1–5% of weekly training. Short sprints, VO₂ max intervals, max power efforts.
Importance of Resting Heart Rate
Your resting heart rate (RHR) is one of the best indicators of cardiovascular fitness. Elite endurance athletes often have RHR below 40 bpm; the average adult is 60–100 bpm. Tracking RHR over time reveals overtraining (sudden increase) or improving fitness (gradual decrease).
Frequently Asked Questions
What is the most accurate formula for maximum heart rate?
Research suggests the Tanaka formula (208 - 0.7 × age) is more accurate than the traditional 220 - age, especially for older adults.
- • Standard 220 - age: simple but high variability (±10-15 bpm)
- • Tanaka 208 - 0.7×age: 2001 meta-analysis of 18,712 subjects
- • For highest accuracy, a lab VO₂ max test is ideal
What is the Karvonen method and why is it better?
The Karvonen method uses Heart Rate Reserve (HRR = Max HR - Resting HR) to calculate zones.
- • It accounts for individual fitness: a fit person with RHR 45 gets different zones than a sedentary person with RHR 75, even at the same age
- • Target HR = Resting HR + HRR × intensity%
- • Requires knowing your resting heart rate (measure upon waking)
What zone is best for fat burning?
Zone 2 (60–70% of max HR) is commonly called the fat-burning zone because fat contributes the highest percentage of energy at this intensity.
- • At Zone 2, fat oxidation is high and sustainable for long durations
- • Higher zones burn more total calories per minute, but less as fat percentage
- • For weight loss, total calorie deficit matters more than fuel source
How do I measure my resting heart rate?
The most accurate method is to measure resting HR immediately upon waking, before getting out of bed.
- • Count beats for 60 seconds (or 30 s and multiply by 2)
- • Average over 3 consecutive mornings for best accuracy
- • A fitness tracker or smart watch can track it automatically overnight
- • Normal resting HR: 60–100 bpm. Athletes: 40–60 bpm
How much time should I spend in each zone?
The 80/20 rule (polarized training) is recommended by many coaches for endurance athletes:
- • 80% of training in Zones 1–2 (easy, aerobic base building)
- • 20% of training in Zones 4–5 (hard intervals and threshold work)
- • Minimize Zone 3 "moderate" training, too hard for recovery, too easy for adaptation
Is it safe to train in Zone 5?
Zone 5 training (90–100% max HR) is very demanding and should be used sparingly.
- • Limit to 1–2 sessions per week maximum, 5–10% of total training volume
- • Requires adequate recovery (24–48 hours) between hard sessions
- • Not recommended for beginners or those with cardiovascular conditions
- • Always consult a doctor before starting high-intensity exercise programs
Why does my heart rate not match the zones during exercise?
Several factors affect heart rate during exercise beyond just intensity:
- • Cardiac drift: HR increases during long sessions even at constant pace
- • Heat and humidity: dehydration raises HR for same effort level
- • Caffeine: temporarily elevates resting and exercise HR
- • Altitude: reduced oxygen raises HR at equivalent effort
- • Overtraining: elevated morning HR is a warning sign to reduce load
Can I use this calculator for cycling or swimming?
Yes, but with a note: cycling and swimming typically show lower maximum heart rates than running.
- • Cycling max HR is typically 5–10 bpm lower than running max HR
- • Swimming max HR can be 10–15 bpm lower (horizontal position reduces cardiac demand)
- • For accuracy, determine your sport-specific max HR through a field test in that sport