Free Heart Rate Zone Calculator

Q: Can I use this calculator if I have a heart condition?

Important: If you have any pre-existing heart condition or other medical concerns, you should consult your doctor or a qualified healthcare professional before starting any new exercise program or using this calculator to set exercise intensity. This tool provides estimates and is not a substitute for professional medical advice.

Find your target heart rate zones for fat burning, endurance, and peak performance

Enter Your Details

Age (Years)

Max HR Formula / Method

Custom Max Heart Rate (bpm)

Estimated Max HR: - bpm

Resting Heart Rate (bpm - optional, for Karvonen)

Gender (optional)

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Your Heart Rate Zones

Zone	Intensity	HR Range (bpm)	Sample Exercises

Disclaimer: This calculator provides estimates. Consult a healthcare professional before starting or modifying any exercise plan.

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What Are the 5 Heart Rate Zones?

Heart rate zones are specific ranges of heartbeats per minute (bpm) that correspond to different levels of exercise intensity. Typically, there are five zones:

Zone 1 (Very Light): 50-60% of Max HR. Ideal for warm-ups, cool-downs, and active recovery. Improves overall health and helps recovery.
Zone 2 (Light): 60-70% of Max HR. Builds endurance, improves fat utilization (fat burning), and enhances cardiovascular efficiency. Comfortable enough to hold a conversation.
Zone 3 (Moderate): 70-80% of Max HR. Improves aerobic fitness, circulation, and lactate threshold. You’ll be breathing more deeply.
Zone 4 (Hard): 80-90% of Max HR. Increases maximum performance capacity and anaerobic threshold. Training in this zone is challenging and can only be sustained for shorter periods.
Zone 5 (Maximum): 90-100% of Max HR. Develops maximum speed and power. This is an all-out effort sustainable for very short bursts.

Training in the correct zone helps you achieve specific outcomes, whether it’s burning fat, building endurance, or improving speed and power, while also minimizing the risk of overtraining or injury.

For most people starting out, Zone 2 (light, conversational pace) is where the majority of training should happen — it builds aerobic base without overloading the body.

What Should My Heart Rate Be During Exercise?

Your target heart rate depends on your age and workout goal. Here is a quick reference based on the standard 220 − Age formula:

Age	Max HR	Zone 2 (Fat Burn)	Zone 3 (Cardio)	Zone 4 (Hard)
20	200 bpm	120–140 bpm	140–160 bpm	160–180 bpm
25	195 bpm	117–136 bpm	136–156 bpm	156–175 bpm
30	190 bpm	114–133 bpm	133–152 bpm	152–171 bpm
35	185 bpm	111–129 bpm	129–148 bpm	148–166 bpm
40	180 bpm	108–126 bpm	126–144 bpm	144–162 bpm
45	175 bpm	105–122 bpm	122–140 bpm	140–157 bpm
50	170 bpm	102–119 bpm	119–136 bpm	136–153 bpm
55	165 bpm	99–115 bpm	115–132 bpm	132–148 bpm
60	160 bpm	96–112 bpm	112–128 bpm	128–144 bpm

Use the heart rate zone calculator above for a more precise result based on your exact age and resting heart rate.

What Is the Fat Burning Heart Rate Zone?

The fat burning zone is Zone 2 — 60–70% of your maximum heart rate. At this intensity, your body uses fat as its primary fuel source rather than carbohydrates.

For a 35-year-old: fat burning zone = 111–129 bpm.
For a 45-year-old: fat burning zone = 105–122 bpm.

This does not mean higher zones burn less fat overall — higher intensity zones burn more total calories per minute. But Zone 2 is sustainable for longer periods, making it ideal for longer workouts focused on fat loss and endurance.

The best approach for weight loss: mix Zone 2 sessions (3–4 times per week) with 1–2 Zone 4 sessions for maximum calorie burn.

Our calculator allows you to choose one of these formulas or enter a custom Max HR if you know it from a test. Once Max HR is determined, the Karvonen formula (if you provide your Resting Heart Rate) can be used for more personalized zone calculations, as it considers your Heart Rate Reserve (HRR = Max HR – Resting HR).

What Is a Normal Resting Heart Rate?

A normal resting heart rate for adults is 60–100 bpm.
Fit individuals and athletes often have a lower resting heart rate — sometimes 40–60 bpm — which indicates a stronger, more efficient heart.

Fitness Level	Resting Heart Rate
Athlete	40–60 bpm
Excellent fitness	60–64 bpm
Good fitness	65–69 bpm
Average	70–79 bpm
Below average	80–89 bpm
Poor	90+ bpm

Track your resting heart rate first thing in the morning over several weeks — a downward trend means your cardiovascular fitness is improving.

Frequently Asked Questions (FAQ)

For most adults, a normal resting heart rate (RHR) ranges from 60 to 100 beats per minute (bpm). However, a lower RHR often indicates better cardiovascular fitness and more efficient heart function. Well-trained athletes might have an RHR closer to 40 bpm. Factors like age, stress, medication, and overall health can affect RHR.

This depends on your fitness goals, current fitness level, and the type of training you’re doing. A common approach for general fitness and endurance is the 80/20 rule: spending about 80% of your training time in lower-intensity zones (Zones 1 and 2) and 20% in higher-intensity zones (Zones 3, 4, and 5). Consult a fitness professional for a personalized plan.

Important: If you have any pre-existing heart condition or other medical concerns, you should consult your doctor or a qualified healthcare professional before starting any new exercise program or using this calculator to set exercise intensity. This tool provides estimates and is not a substitute for professional medical advice.

Age-based formulas provide an estimate of Max HR. Fitness trackers also often use similar formulas initially, but some can adjust their Max HR estimate over time based on your workout data. The most accurate Max HR comes from a clinical stress test. Small variations are normal. If there’s a large discrepancy, or if you have concerns, consult a professional.

The standard method calculates zones as a direct percentage of your Max HR (e.g., 70% of Max HR). The Karvonen formula is more personalized as it uses your Heart Rate Reserve (HRR), which is your Max HR minus your Resting Heart Rate (RHR). The formula is: Target HR = (HRR * %Intensity) + RHR. It’s often considered more accurate for individuals with a known RHR, as it accounts for their current fitness level to some extent.

Zone 2 (60–70% of max HR) burns the highest proportion of fat per calorie burned and can be sustained for long periods — making it best for total fat loss over time. However, Zone 4 burns more total calories per minute. Combining both — mostly Zone 2 with occasional Zone 4 sessions — gives the best results for weight loss.