How do I calculate my maximum heart rate (MHR)?

The most common clinical formula is the Tanaka equation: MHR = 208 - (0.7 × Age). The traditional Haskell & Fox formula (220 - Age) is also widely used as a standard benchmark.

What is the difference between the standard method and the Karvonen formula?

The standard method simply multiplies your maximum heart rate by a percentage. The Karvonen formula calculates your Heart Rate Reserve (MHR minus Resting Heart Rate), providing a significantly more personalized zone calculation tailored to your actual cardiovascular fitness.

What is a normal resting heart rate for adults?

According to the American Heart Association (AHA) and CDC, a normal resting heart rate for healthy adults ranges from 60 to 100 beats per minute (BPM). Well-conditioned athletes may have resting rates between 40 and 60 BPM.

Target Heart Rate & Heart Rate Zone Calculator

Optimize your fitness training by finding your ideal heart rate zones for burning fat, building endurance, or maxing out performance with CDC and AHA clinical formulas.

Your Details

Age *

Resting Heart Rate

Optional

bpm

Providing your RHR unlocks the highly accurate Karvonen & Borg methods.

Ready to calculate your training zones?

Enter your age (and optionally your resting heart rate) to see your personalized heart rate targets.

Written ByFree USA Calculators Clinical Editorial Team

Medically Reviewed ByDr. Sarah Jenkins, RD, LDNRegistered Dietitian & Clinical Nutritionist

Last Clinically Reviewed: October 2026

Scientific Formula & Calculation Methodology (Haskell-Fox, Tanaka (2001), Nes et al. (2013) & Karvonen Reserve)

Target heart rate zones determine training intensity based on Maximum Heart Rate (MHR) and optionally Heart Rate Reserve (HRR = MHR - RHR). Standard zones range from Zone 1 (50–60% active recovery/warm-up) through Zone 2 (60–70% aerobic base/fat oxidation) up to Zone 5 (90–100% neuromuscular VO₂ max power).

Important Clinical Limitations of Target Heart Rate Calculator

Age-predicted formulas have a standard deviation of ±10–12 BPM; true individual maximums may diverge due to genetics, athletic history, and climate.
Cardiovascular medications such as beta-blockers, calcium-channel blockers, and antiarrhythmics artificially suppress heart rate response; individuals taking these medications should use the Borg RPE exertion scale rather than raw BPM targets.
Cardiac patients or individuals with pre-existing coronary conditions should consult a cardiologist before training at or above Zone 4 (80%+ MHR).

Peer-Reviewed Literature & Recognized Medical Sources

Target Heart Rate and Estimated Maximum Heart RateCenters for Disease Control and Prevention (CDC)

Exercise and the Heart: Target Heart RatesAmerican Heart Association (AHA)

Age-predicted maximal heart rate revisitedJournal of the American College of Cardiology (JACC)

Adheres to strict clinical accuracy standards & evidence-based protocols.

About Us•Editorial Policy•Medical Disclaimer

The Fundamentals: Understanding Your Heart Rate

Your Heart Rate is the foundation of any serious fitness or weight loss protocol. Measured in Beats Per Minute (BPM), it acts as a live dashboard for your body's cardiovascular engine. To truly dial in your workouts, burn stubborn fat, and prevent overtraining, you must master three critical metrics: your resting baseline, your absolute ceiling, and your metabolic reserve.

What is Maximum Heart Rate (MHR)?

Your Maximum Heart Rate (MHR) is the absolute highest BPM your heart can sustain during all-out physical exertion. While clinical VO₂ max testing is the gold standard, most Americans rely on scientifically validated estimation formulas to program their workouts.

Because your maximum engine speed naturally drops as you age, these formulas use age as the primary variable. Keep in mind that elite CrossFitters and beginners of the exact same age can have different maximums. Our tool uses the three most respected clinical algorithms:

Haskell & Fox (1971): The classic American standard. Formula: 220 - Age
Tanaka, Monahan, & Seals (2001): A highly precise modern formula. Formula: 208 - (0.7 × Age)
Nes et al. (2013): Incredibly accurate for active, healthy adults. Formula: 211 - (0.64 × Age)

The Importance of Resting Heart Rate (RHR)

Your Resting Heart Rate (RHR) indicates how efficiently your heart pumps blood when you are completely relaxed. For the average American adult, this sits between 60 and 100 BPM. However, highly conditioned athletes often boast a resting rate in the 40s or 50s. Tracking your RHR every morning is the ultimate hack to monitor your cardiovascular health, stress levels, and workout recovery.

Unlocking Your Heart Rate Reserve (HRR)

Your Heart Rate Reserve (HRR) is the vital gap between your resting baseline and your maximum ceiling. It literally represents the true "working capacity" your heart has available for exercise.

Formula: HRR = MHR - RHR

Decoding The 5 Target Training Zones

Exercising within specific Target Heart Rate Zones guarantees you are training with intention. Staying too low wastes your time, while redlining too often leads to CNS fatigue and injury.

Zone 1 (50-60%): Very Light

The perfect zone for warm-ups, cool-downs, and active recovery on your rest days.

Zone 2 (60-70%): Light

The famous Fat Burning Zone. Highly sustainable for long durations, building a massive aerobic base while prioritizing fat oxidation.

Zone 3 (70-80%): Moderate

Boosts aerobic capacity, stamina, and cardiovascular efficiency. The sweet spot for tempo runs or intense cycling.

Zone 4 (80-90%): Hard

Pushes your anaerobic threshold. Training here trains your body to buffer lactic acid and sustain high speeds under heavy fatigue.

Zone 5 (90-100%): Maximum

An all-out sprint. Sustainable for only very short bursts to build absolute peak muscle power and fast-twitch fiber recruitment.

Which Calculation Method is Best?

The Standard Percentage Method: This simply multiplies your maximum heart rate by the target percentage (e.g., 184 × 0.70 = 129 BPM). It's incredibly simple, but completely ignores your resting baseline.

The Karvonen Method: The gold standard for personalized athletic training. By factoring in your Heart Rate Reserve, the Karvonen method provides a highly tailored target heart rate that scales precisely with your actual fitness level.

The Borg RPE Scales: The Rating of Perceived Exertion (RPE) is a fascinating subjective scale. It allows you to rate how hard you feel you are working. Sports science proves individuals are remarkably accurate at predicting their own target heart rate when using the Borg scales to rate exertion levels like "Somewhat hard" or "Very difficult."

Frequently Asked Questions About Heart Rate Zones

For most adults, the primary fat-burning zone (Zone 2) sits between 60% and 70% of your maximum heart rate. At this intensity, your body oxidizes a higher percentage of fatty acids relative to glycogen for cellular fuel.

Medical Disclaimer: This Target Heart Rate Calculator and the information provided are for educational and informational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider before beginning any new exercise program, especially if you have a history of heart disease, take medication that affects your heart rate, or have any other medical conditions.