Zone 2 Heart Rate and Training Zones Explained

Zone 2 heart rate is the easy aerobic range in a 5-zone heart-rate model. It is commonly estimated at 60% to 70% intensity, either from maximum heart rate or from heart-rate reserve using the Karvonen method.

For a quick estimate, use the Calzivo Heart Rate Zones Calculator. Enter your age, choose simple max-HR or Karvonen, add resting heart rate if needed, and review your Zone 2 range plus all five zones.

Quick Answer: What Is Zone 2 Heart Rate?

Zone 2 is the range where effort feels steady, controlled, and conversational. In a simple 5-zone model, it is often 60% to 70% of estimated max heart rate. With the Karvonen method, it is 60% to 70% of heart-rate reserve added back to resting heart rate.

Method	What it uses	Zone 2 formula
Max heart rate percentage	Age or known max HR	Max HR x 0.60 to max HR x 0.70
Karvonen heart-rate reserve	Max HR and resting HR	Resting HR + (max HR - resting HR) x 0.60 to 0.70

How to Calculate Zone 2 Heart Rate

There are two common ways to estimate Zone 2. The simple method is faster. The Karvonen method adds resting heart rate, so it can feel more personalized for people who track that number.

Method 1: max heart rate percentage

Start by estimating maximum heart rate:

Estimated max HR = 220 - age

Then calculate Zone 2:

Zone 2 low = max HR x 0.60
Zone 2 high = max HR x 0.70

Example for age 30:

Max HR = 220 - 30 = 190
Zone 2 = 190 x 0.60 to 190 x 0.70
Zone 2 = about 114 to 133 BPM

Method 2: Karvonen heart rate reserve

The Karvonen method uses resting heart rate and heart-rate reserve:

Heart rate reserve = max HR - resting HR
Target HR = resting HR + (heart rate reserve x intensity)

Example for age 40 with resting heart rate 60:

Max HR = 220 - 40 = 180
Heart rate reserve = 180 - 60 = 120
Zone 2 low = 60 + (120 x 0.60) = 132
Zone 2 high = 60 + (120 x 0.70) = 144

Estimated Zone 2 by Karvonen: about 132 to 144 BPM.

Zone 2 Examples by Age

This chart uses the simple 220-minus-age method and 60% to 70% of estimated max heart rate.

Age	Estimated max HR	Approx. Zone 2
20	200 BPM	120-140 BPM
30	190 BPM	114-133 BPM
40	180 BPM	108-126 BPM
50	170 BPM	102-119 BPM
60	160 BPM	96-112 BPM
70	150 BPM	90-105 BPM

Age charts are useful starting points, but they are not exact. Real heart-rate response can change with fitness level, genetics, heat, fatigue, sleep, caffeine, stress, medications, and device accuracy.

How to Use Calzivo's Heart Rate Zone Calculator

1. Open the Heart Rate Zones Calculator.
2. Enter your age.
3. Choose the simple max-HR method for a quick estimate, or Karvonen if you know resting heart rate.
4. Enter a known max heart rate if you have a reliable tested value; otherwise leave it blank.
5. Review your highlighted Zone 2 range and the full 5-zone table.

The calculator also links to related Health & Fitness tools such as the Calorie Calculator, Macro Calculator, BMI Calculator, Body Fat Calculator, and Ideal Weight Calculator.

How Zone 2 Should Feel

Zone 2 should not feel like a hard interval. A useful cue is conversational pace: you can speak in full sentences, breathing is steady, and the effort feels repeatable. If you are gasping or can only say a few words, you may be above Zone 2.

Walking, cycling, rowing, elliptical training, easy jogging, and run-walk intervals can all fit Zone 2 depending on fitness level. Beginners may need to slow down more than expected, and that is normal.

Common Mistakes

Accuracy and Limitations

Heart-rate zones are estimates. They can be useful for planning, but they cannot confirm your exact aerobic threshold, diagnose a health issue, or replace professional guidance.

Use the number with the talk test, perceived effort, pace, recovery, and common sense. If the range feels wrong, compare methods in the calculator and consider whether heat, terrain, fatigue, stress, sleep, caffeine, or device accuracy may be affecting the reading.

Quick Zone 2 Checklist

FAQ

Try the Tool