How do you calculate Maximum Heart Rate (MHR)?

The Tanaka formula calculates `MHR = 208 - (0.7 × Age)`, which is more accurate across all age groups than the traditional `220 - Age` formula.

Why is Zone 2 training so popular for endurance and metabolic health?

Zone 2 (60%–70% MHR) maximizes mitochondrial efficiency, fat oxidation (burning fat as primary fuel), and cardiovascular endurance without generating excessive muscular fatigue.

What is the Karvonen Heart Rate Reserve (HRR) formula?

The Karvonen formula accounts for resting heart rate: `Target Heart Rate = [(MHR - RHR) × Intensity %] + RHR`. This provides personalized training zones for athletes with low resting heart rates.

How do I measure my resting heart rate accurately?

Measure your pulse for 60 seconds immediately upon waking in the morning while still lying in bed, before consuming caffeine or getting up.

What is Zone 5 training used for?

Zone 5 (90%–100% MHR) trains anaerobic capacity, sprinting speed, and VO2 Max through short high-intensity intervals (15–60 seconds).

What is the Tanaka formula for calculating Maximum Heart Rate (MHR)?

The Tanaka formula calculates `MHR = 208 - (0.7 × Age)`, providing a more accurate benchmark for older adults than the classic `220 - Age` estimate.

Health & Fitness Cluster

Heart Rate Zone Calculator (5 Target Cardio Zones & Karvonen)

Calculate target cardiovascular training zones (Zone 1 to Zone 5) using resting and max heart rate.

TL;DR: Heart Rate Zone Calculator determines your 5 aerobic and anaerobic cardio training zones using the Tanaka maximum heart rate formula and the Karvonen Heart Rate Reserve (HRR) method.

Age

What Are the 5 Heart Rate Training Zones and Their Percentages?

The 5 standard heart rate training zones based on Maximum Heart Rate (MHR) are: Zone 1 (Recovery, 50%–60% MHR), Zone 2 (Aerobic Base / Fat Burn, 60%–70% MHR), Zone 3 (Tempo / Aerobic Endurance, 70%–80% MHR), Zone 4 (Threshold / Lactate, 80%–90% MHR), and Zone 5 (Neuromuscular / VO2 Max, 90%–100% MHR).

How to Use the Heart Rate Zone Calculator

Our Heart Rate Zone Calculator performs high-precision mathematical operations directly in your browser with zero latency and complete client-side privacy.

Enter your Current Age in years.
Optionally enter your Measured Resting Heart Rate (BPM) taken upon waking.
Select calculation method: Tanaka Formula ($208 - 0.7 \times \text{Age}$) OR Karvonen HRR Method.
Click 'Calculate Zones' to generate personalized BPM boundaries for all 5 training zones.
Use the target BPM ranges to pace cycling, running, and HIIT workouts.

Mathematical Formula & Equations

Computes cardio training zones: Zone 1 (Warm up 50-60%), Zone 2 (Fat Burn 60-70%), Zone 3 (Aerobic 70-80%), Zone 4 (Threshold 80-90%), Zone 5 (VO2 Max 90-100%).

\[ \text{HR}_{\max} = 220 - \text{Age}, \quad \text{Target Zone} = \text{HR}_{\max} \times \text{Zone }\% \]

Calculation Example

For a 25-year-old ($ ext{HR}_{max} = 195$ bpm): Zone 2 Fat Burn is 117–136 bpm; Zone 4 Anaerobic is 156–175 bpm.

100% Client-Side Privacy & Data Security

All calculations, amortization schedules, variables, and sensitive numerical datasets execute 100% locally in your web browser memory. Your financial, medical, and personal values are never transmitted, logged, or uploaded to any external server.

Frequently Asked Questions

: The Tanaka formula calculates `MHR = 208 - (0.7 × Age)`, which is more accurate across all age groups than the traditional `220 - Age` formula.
: Zone 2 (60%–70% MHR) maximizes mitochondrial efficiency, fat oxidation (burning fat as primary fuel), and cardiovascular endurance without generating excessive muscular fatigue.
: The Karvonen formula accounts for resting heart rate: `Target Heart Rate = [(MHR - RHR) × Intensity %] + RHR`. This provides personalized training zones for athletes with low resting heart rates.
: Measure your pulse for 60 seconds immediately upon waking in the morning while still lying in bed, before consuming caffeine or getting up.
: Zone 5 (90%–100% MHR) trains anaerobic capacity, sprinting speed, and VO2 Max through short high-intensity intervals (15–60 seconds).
: The Tanaka formula calculates `MHR = 208 - (0.7 × Age)`, providing a more accurate benchmark for older adults than the classic `220 - Age` estimate.

Cite This Calculator

Need to reference this online calculator in a financial proposal, academic paper, blog post, or classroom curriculum? Copy a citation below.

NexLove.org. (2026). Heart Rate Zone Calculator [Online Calculation Tool]. https://nexlove.org/tools/heart-rate-zone-calculator

“Heart Rate Zone Calculator.” NexLove.org, 2026, nexlove.org/tools/heart-rate-zone-calculator.

NexLove.org (2026) Heart Rate Zone Calculator. Available at: https://nexlove.org/tools/heart-rate-zone-calculator (Accessed: 2026).

@misc{nexlove_heart_rate_zone_calculator,
  title = {Heart Rate Zone Calculator},
  author = {{NexLove.org}},
  year = {2026},
  url = {https://nexlove.org/tools/heart-rate-zone-calculator}
}

Embed This Tool

Add the live Heart Rate Zone Calculator to your own website with this snippet — it loads the real, working calculator in an iframe.

<iframe src="https://nexlove.org/embed/heart-rate-zone-calculator.html" width="100%" height="600" style="border:1px solid #e2e8f0;border-radius:12px" title="Heart Rate Zone Calculator — NexLove.org" loading="lazy"></iframe>

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