Target Heart Rate Calculator

Whether you're just getting into fitness or you've been training for years, knowing your target heart rate can make a real difference in how you exercise. It takes the guesswork out of your workouts and tells you whether you're pushing hard enough, overdoing it, or just coasting along without much benefit. A target heart rate calculator uses your age and, optionally, your resting heart rate to give you a personalized range of beats per minute to aim for during exercise. Hit that range, and you're working at an intensity that actually moves the needle for your fitness goals. This guide walks through how the calculator works, the formulas behind it, what each training zone means, and how to apply all of this to your actual workouts.

Enter Details

Age(age 10 to 100 only)

Resting heart rate (optional)

If set, Karvonen zones use reserve: (max − resting) × intensity + resting.

Result

Training zones from age (and optional resting HR).

Note — This result is an estimate. Talk to a healthcare provider for personalized guidance.

How to Use the Target Heart Rate Calculator

Using a target heart rate calculator is straightforward. You typically need just two pieces of information: your age and your resting heart rate. Your resting heart rate is the number of beats per minute your heart pumps when you're completely at rest, ideally measured first thing in the morning before you get out of bed.

Once you enter those numbers, the calculator does the math and outputs a heart rate range expressed in beats per minute (bpm). That range represents the intensity you should aim for during exercise to achieve a specific goal, whether that's burning fat, improving cardiovascular fitness, or pushing your performance ceiling.

To check your heart rate during a workout, you can use a heart rate monitor or fitness tracker, or simply find your pulse at your wrist or neck and count beats for 15 seconds, then multiply by four. It's not perfectly precise, but it works well enough for most people.

Calculate Your Target Heart Rate Zone

Your target heart rate zone is a percentage range of your maximum heart rate. Most general fitness guidelines recommend working between 50% and 85% of your maximum heart rate, depending on what you're trying to accomplish.

The most widely used method for calculating your zone is the Karvonen formula, which factors in your resting heart rate to give a more personalized result. Here's how it works:

Find your maximum heart rate (see the next section for how to do this).
Subtract your resting heart rate from your max heart rate. This gives you your heart rate reserve (HRR).
Multiply your HRR by the lower and upper percentages of your desired zone (for example, 0.50 and 0.85).
Add your resting heart rate back to each result.

The numbers you end up with are your target heart rate zone in bpm. Training within that window means your cardiovascular system is being challenged at the right level for your goal.

Maximum Heart Rate Calculator

Your maximum heart rate (MHR) is the upper limit of what your heart can handle during intense physical activity. It's a ceiling, not a goal. You don't want to sustain exercise at your max heart rate for long, but knowing it is essential for calculating every training zone below it.

Maximum heart rate decreases with age, which is why age is the main input in most MHR formulas. A 20-year-old will have a significantly higher max heart rate than a 60-year-old, and training zones shift accordingly.

There are a few different formulas for estimating MHR. None of them are perfect since there's natural variation between individuals, but they give you a solid working estimate to build your zones around.

220 Minus Age Formula

The most common formula is simple: 220 minus your age. If you're 35 years old, your estimated maximum heart rate is 185 bpm. That's it.

This formula has been used for decades and is the default in most fitness apps, heart rate monitors, and exercise equipment. It's easy to remember and quick to calculate in your head.

That said, it's not the most accurate option available. Research has shown that it tends to overestimate MHR in younger people and underestimate it in older adults. The standard deviation for this formula is roughly plus or minus 10 to 12 bpm, which means your actual max could be meaningfully higher or lower than the estimate. For most recreational exercisers, though, it's accurate enough to get started.

Alternative Maximum Heart Rate Formulas

If you want a more refined estimate, a few alternative formulas have been developed based on larger or more specific population studies.

Formula	Equation	Best For
Tanaka Formula	208 − (0.7 × age)	Healthy adults; tends to be more accurate for older individuals
Gellish Formula	207 − (0.7 × age)	General population; similar to Tanaka with a slight offset
Fox Formula (classic)	220 − age	Most widely used; simple and familiar
Gulati Formula	206 − (0.88 × age)	Specifically developed for women

The Tanaka formula is a popular upgrade from the classic 220-minus-age approach. It was developed through a meta-analysis of over 350 studies and performs better across a wide age range. For most people who want a bit more precision without lab testing, Tanaka is a solid choice.

The only truly accurate way to determine your maximum heart rate is through a medically supervised stress test, but that level of precision isn't necessary for everyday training.

Heart Rate Training Zones

Training zones break your full heart rate range into segments, each associated with a different physiological response and fitness benefit. Most systems use five zones, though some programs use three or six. The five-zone model is the most common and gives you enough granularity to plan workouts meaningfully.

Zones are expressed as percentages of your maximum heart rate. The higher the zone, the harder your heart is working and the shorter the duration you can sustain it. Different zones serve different purposes, so a balanced training plan usually includes time across several of them rather than always grinding at max effort.

Fat Burning Zone

The fat burning zone sits at roughly 50% to 65% of your maximum heart rate. At this intensity, your body draws a higher proportion of its energy from fat stores rather than carbohydrates, which is where the name comes from.

This zone feels comfortable. You can hold a conversation without gasping. It's the pace of a brisk walk, a light jog, or easy cycling. It's great for beginners, for active recovery days, or for long-duration low-intensity sessions.

One thing worth clarifying: while the fat-burning zone does burn a higher percentage of calories from fat, you're burning fewer total calories per minute compared to higher-intensity zones. If overall calorie burn is the goal, harder zones may be more efficient. But for endurance base building and sustainability, this zone has real value.

Cardio and Aerobic Zone

The aerobic zone runs from about 65% to 80% of your maximum heart rate. This is where most of your cardiovascular fitness improvements happen. Your heart and lungs are working hard, your breathing rate increases noticeably, and your body is still primarily using oxygen to fuel the effort.

This zone is the workhorse of endurance training. Sustained aerobic zone work strengthens your heart muscle, improves oxygen delivery to muscles, increases mitochondrial density, and builds the kind of base fitness that supports everything else you do. Most of your weekly training volume probably belongs here.

Holding a conversation at this intensity is possible but harder. You can get out a sentence or two, but you're not chatting comfortably. That's a practical way to know you're in the right range without looking at a monitor.

Peak Performance Zone

The peak performance zone covers roughly 80% to 95% of your maximum heart rate. At this intensity, you're working at a high output that taxes your cardiovascular and muscular systems significantly. This is where speed work, interval training, and race-pace efforts live.

You can't sustain this zone for long. That's the point. Short, hard bursts in the peak zone drive specific adaptations: increased lactate threshold, improved VO2 max, and better high-end speed. These are the kinds of gains that make you faster and more powerful over time.

This zone isn't appropriate for every workout, and it definitely shouldn't dominate a beginner's training plan. But used strategically, high-intensity work in the peak zone is one of the most effective tools for advancing fitness. Most training plans recommend spending no more than 10% to 20% of total weekly training time here.

Target Heart Rate Formula

The two main formulas used to calculate target heart rate are the percentage of maximum heart rate method and the Karvonen (heart rate reserve) method.

The simpler approach just takes a percentage of your estimated MHR. For example, if your MHR is 185 bpm and you want to train at 70%, your target is 129.5 bpm, which you'd round to 130 bpm. Easy math, but it doesn't account for your individual fitness level.

The Karvonen formula is more personalized because it incorporates your resting heart rate:

Heart Rate Reserve (HRR) = Max Heart Rate − Resting Heart Rate
Target HR = (HRR × Intensity%) + Resting Heart Rate

So if your max is 185 bpm, your resting heart rate is 60 bpm, and you want to train at 70% intensity: HRR = 185 − 60 = 125. Target HR = (125 × 0.70) + 60 = 87.5 + 60 = 147.5 bpm. Notice how that's higher than the simpler 130 bpm estimate. That difference reflects your actual fitness baseline, which is why the Karvonen method tends to be more accurate for individuals who are reasonably fit.

Target Heart Rate Chart by Age

The table below shows estimated target heart rate zones using the 220-minus-age formula for maximum heart rate. These ranges represent 50% to 85% of MHR and give a general starting point for most healthy adults. Your actual zones may vary based on fitness level, resting heart rate, and individual physiology.

Age	Estimated MHR (bpm)	50% (Low End)	70% (Moderate)	85% (High End)
20	200	100	140	170
25	195	98	137	166
30	190	95	133	162
35	185	93	130	157
40	180	90	126	153
45	175	88	123	149
50	170	85	119	145
55	165	83	116	140
60	160	80	112	136
65	155	78	109	132

These numbers are estimates. Use them as a starting framework and adjust based on how your body responds during actual workouts. If a zone feels too easy or too hard for its designated intensity, your real MHR may differ from the formula's prediction.

Resting Heart Rate vs Target Heart Rate

Resting heart rate and target heart rate are related but measure very different things. Your resting heart rate is a baseline measurement, the number of times your heart beats per minute when you're completely still and relaxed. For most adults, a normal resting heart rate falls between 60 and 100 bpm, though well-trained athletes can have resting rates in the 40s or even lower.

A lower resting heart rate generally signals a more efficient cardiovascular system. Your heart pumps more blood per beat, so it doesn't need to beat as often to meet your body's demands at rest. Monitoring your resting heart rate over time is actually a useful way to track your overall fitness progress.

Target heart rate, on the other hand, is the range you aim for during exercise. It's dynamic and intentional. You're actively working to elevate your heart rate to a specific zone to produce a specific training effect.

The relationship between the two matters when using the Karvonen formula. A person with a low resting heart rate will have a higher heart rate reserve, which means their calculated target heart rate will be somewhat higher than someone with the same MHR but a higher resting rate. In practical terms, a fitter person needs to work a bit harder in absolute terms to hit the same relative intensity.

Heart Rate Calculation Examples

Let's put the formulas into practice with a couple of concrete examples.

Example 1: 40-year-old beginner
Age: 40 | Resting HR: 72 bpm | Goal: Fat burning zone (50–65%)

MHR (220 − 40) = 180 bpm
HRR = 180 − 72 = 108 bpm
Lower target: (108 × 0.50) + 72 = 54 + 72 = 126 bpm
Upper target: (108 × 0.65) + 72 = 70.2 + 72 = 142 bpm

This person should aim to keep their heart rate between 126 and 142 bpm for a fat-burning workout.

Example 2: 28-year-old runner
Age: 28 | Resting HR: 52 bpm | Goal: Aerobic zone (65–80%)

MHR (220 − 28) = 192 bpm
HRR = 192 − 52 = 140 bpm
Lower target: (140 × 0.65) + 52 = 91 + 52 = 143 bpm
Upper target: (140 × 0.80) + 52 = 112 + 52 = 164 bpm

The runner's aerobic zone runs from 143 to 164 bpm. Notice how the low resting heart rate pushes the zone noticeably higher compared to someone the same age but less fit. That's the Karvonen formula doing its job.

Factors That Affect Target Heart Rate

Your calculated target heart rate is an estimate built on averages, and a handful of real-world variables can shift your actual heart rate response in significant ways.

Age: As you get older, your maximum heart rate naturally declines, which lowers all your training zones proportionally.
Fitness level: Better cardiovascular fitness usually means a lower resting heart rate and a more efficient heart, which affects your heart rate reserve and your response to exercise intensity.
Medications: Beta-blockers and some other heart medications directly slow the heart rate. If you're on medication that affects your HR, standard formulas may not apply to you. Talk to your doctor about adjusted targets.
Heat and humidity: Exercising in hot or humid conditions causes your heart rate to rise higher than it would in cooler conditions at the same effort level. Your perceived exertion and actual cardiovascular strain go up even if the pace stays the same.
Dehydration: Even mild dehydration can push your heart rate up. Your blood volume drops, so your heart compensates by beating faster to deliver the same amount of oxygen to working muscles.
Altitude: Less oxygen in the air at higher elevations means your heart has to work harder to supply muscles with what they need. Heart rates at altitude are typically elevated compared to sea level.
Stress and sleep: Poor sleep and high psychological stress both elevate baseline heart rate, which can throw off your training zones if you're comparing days without accounting for these factors.

None of these factors make the calculator useless; they just mean you should treat your calculated zones as a starting point and stay tuned into how your body actually feels during exercise. Over time, you'll develop a sense of what the numbers mean for you specifically.

Age	Estimated MHR (bpm)	50% (Low End)	70% (Moderate)	85% (High End)
20	200	100	140	170
25	195	98	137	166
30	190	95	133	162
35	185	93	130	157
40	180	90	126	153
45	175	88	123	149
50	170	85	119	145
55	165	83	116	140
60	160	80	112	136
65	155	78	109	132

Age	Estimated MHR (bpm)	50% (Low End)	70% (Moderate)	85% (High End)
20	200	100	140	170
25	195	98	137	166
30	190	95	133	162
35	185	93	130	157
40	180	90	126	153
45	175	88	123	149
50	170	85	119	145
55	165	83	116	140
60	160	80	112	136
65	155	78	109	132