Why include resting heart rate?

It personalizes zones through heart-rate reserve rather than age alone.

Which zone burns the most fat?

Lower aerobic zones rely more on fat oxidation, but total energy balance still matters most.

Can medications alter target zones?

Yes. Beta blockers and other drugs can significantly change heart-rate response.

Should beginners train in high zones daily?

No. Most sessions should stay easy to build capacity and reduce injury risk.

Can stress raise workout heart rate?

Yes, sleep loss, heat, dehydration, and stress can elevate HR at the same pace.

How do I find true HR max?

A supervised maximal test is more accurate than formula-based estimation.

Are smartwatch heart-rate readings reliable?

Usually good for steady cardio, less reliable for high-intensity intervals.

What is a recovery zone?

Typically around 50% to 60% of heart-rate reserve for very easy effort.

Can I use heart rate for strength training?

It is less useful than RPE/load metrics for short heavy lifting sets.

Target Heart Rate Calculator

Find cardio training zones for recovery, endurance, tempo, and high-intensity intervals.

Free Calculator
Instant Results
Mobile Friendly
No Registration Required

Introduction

Target heart rate zones help you match effort to workout goals, from easy aerobic sessions to VO2-focused intervals.

Using heart-rate reserve (Karvonen method) with resting heart rate usually provides more personalized zones than age-only formulas.

How To Use

Step 1: Enter age
Used to estimate maximum heart rate.
Step 2: Enter resting heart rate
Measure in the morning before activity.
Step 3: Compute HR max
Use age-based max heart rate estimate.
Step 4: Choose intensity zone
Select target intensity as percentage of reserve.
Step 5: Calculate zone bpm
Tool returns lower and upper target beats per minute.
Step 6: Use in training plan
Assign zones to recovery, base, tempo, and interval days.

Formula

HRmax = 220 - age; THR = ((HRmax - HRrest) x intensity) + HRrest

Karvonen uses heart-rate reserve (HRmax - HRrest) and scales it by target intensity, then adds resting rate back.

Variables

HRmax: Maximum Heart Rate — Estimated peak heart rate.
HRrest: Resting Heart Rate — Lowest resting bpm.
intensity: Exercise Intensity — Target effort as decimal (for example 0.70).
THR: Target Heart Rate — Desired training bpm.

Examples

Example 1: Zone 2 lower bound

Input

Age: 35
Resting HR: 60
Intensity: 0.60

Calculation

HRmax=185; THR=((185-60)x0.60)+60 = 135

Result

Target HR: 135 bpm

Example 2: Zone 2 upper bound

Input

Age: 35
Resting HR: 60
Intensity: 0.70

Calculation

THR=((185-60)x0.70)+60 = 147.5

Result

Target HR: about 148 bpm

Example 3: Tempo effort

Input

Age: 28
Resting HR: 55
Intensity: 0.82

Calculation

HRmax=192; THR=((192-55)x0.82)+55 = 167.3

Result

Tempo target: about 167 bpm

Benefits

Personalizes cardio intensity zones
Prevents too-hard easy days
Supports polarized training structures
Improves recovery management
Helps correlate effort and adaptation

FAQ

No. It is a population estimate and individual max can vary by 10 to 15 bpm.

Introduction

How To Use

Step 1: Enter age

Step 2: Enter resting heart rate

Step 3: Compute HR max

Step 4: Choose intensity zone

Step 5: Calculate zone bpm

Step 6: Use in training plan

Formula

Variables

Examples

Example 1: Zone 2 lower bound

Input

Calculation

Result

Example 2: Zone 2 upper bound

Input

Calculation

Result

Example 3: Tempo effort

Input

Calculation

Result

Benefits

FAQ

Is 220-age perfectly accurate?−

Why include resting heart rate?+

Which zone burns the most fat?+

Can medications alter target zones?+

Should beginners train in high zones daily?+

Can stress raise workout heart rate?+

How do I find true HR max?+

Are smartwatch heart-rate readings reliable?+

What is a recovery zone?+

Can I use heart rate for strength training?+

Related Calculators

Introduction

How To Use

Step 1: Enter age

Step 2: Enter resting heart rate

Step 3: Compute HR max

Step 4: Choose intensity zone

Step 5: Calculate zone bpm

Step 6: Use in training plan

Formula

Variables

Examples

Example 1: Zone 2 lower bound

Input

Calculation

Result

Example 2: Zone 2 upper bound

Input

Calculation

Result

Example 3: Tempo effort

Input

Calculation

Result

Benefits

FAQ

Is 220-age perfectly accurate?−

Why include resting heart rate?+

Which zone burns the most fat?+

Can medications alter target zones?+

Should beginners train in high zones daily?+

Can stress raise workout heart rate?+

How do I find true HR max?+

Are smartwatch heart-rate readings reliable?+

What is a recovery zone?+

Can I use heart rate for strength training?+

Related Calculators