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Target Heart Rate Calculator

Health

Calculate your target heart rate zone for fat burning, cardio, and peak performance training, using the Karvonen formula and resting rate instantly.

Reviewed by the thecalcu.com team · Last updated July 22, 2026

Age
yrs
1580
Resting Heart Rate
bpm
40100
Training Zone

Moderate — Cardio

0–0bpm

target heart rate zone

Max Heart Rate

0 bpm

HR Reserve

0 bpm

What is a Target HR?

A target heart rate calculator computes the ideal heart rate range (in beats per minute) for your training session based on your age, resting heart rate, and chosen training intensity. Training within your target zone ensures you are working hard enough to produce cardiovascular adaptation without overloading your heart, too easy and you get little benefit; too hard and you cannot sustain it safely.

This calculator uses two key formulas. First, the Tanaka formula (208 − 0.7 × Age) estimates your maximum heart rate, it is more accurate than the common "220 minus age" rule, especially for adults over 40. Second, the Karvonen formula personalises your training zone using Heart Rate Reserve (max HR minus resting HR), producing a zone that reflects your individual cardiovascular fitness rather than just your age.

The result is a min–max bpm range that corresponds to your selected intensity level: Light (fat-burn zone), Moderate (cardio), Vigorous (aerobic), or Maximum (peak performance). Use this alongside the Calories Burned Calculator to plan sessions that hit both your heart rate and calorie targets.

Why Use a Target Heart Rate Calculator?

Train smarter, not just harder. Many people either under-train (a walk that barely raises the heart rate) or over-train (gasping unsustainably) without realising it. Target heart rate gives you a precise bpm range to stay in for the type of adaptation you want.

Personalise your zones. Generic heart rate zone charts assume an average resting heart rate. If you have a low resting HR (highly fit) or a high resting HR (deconditioned), generic charts give you wrong zones. The Karvonen formula adjusts for your individual resting HR, making the zone genuinely yours.

Progress tracking. As your fitness improves, your resting heart rate drops, the same zone now requires more effort to maintain. Use the calculator monthly to see how your zones shift as your cardiovascular fitness improves.

Who Should Use This Calculator?

Runners and cyclists using heart rate monitors who want scientifically grounded training zones rather than generic percentage tables.

Beginners starting cardio who want to know whether their workout intensity is sufficient. If your heart rate during exercise is well below your Moderate zone minimum, you need to pick up the pace.

People with specific cardio goals, fat burning (Light zone), improving VO₂ max (Vigorous zone), or preparing for endurance events (Moderate to Vigorous zone).

Anyone over 40 where the "220 minus age" formula becomes increasingly inaccurate, the Tanaka formula used here was validated specifically for middle-aged and older adults.

What Insights Does the Target Heart Rate Calculator Give You?

Target HR Min and Max define your training zone in bpm, the range your heart rate should stay within during the session for your chosen intensity. Most fitness watches and chest strap monitors can display current bpm and alert you when you drift outside this range.

Max Heart Rate (bpm) is your theoretical ceiling, estimated using the Tanaka formula. Knowing this helps you understand where your training zones sit relative to your maximum capacity.

Heart Rate Reserve (bpm) is the difference between your max and resting heart rate. A larger HRR indicates better cardiovascular fitness. Elite endurance athletes have HRRs of 130–160 bpm; sedentary adults may have HRRs of 70–90 bpm.

How to use this Target HR calculator

  1. Enter your Age in years, used to estimate maximum heart rate via the Tanaka formula.

  2. Enter your Resting Heart Rate in bpm, measure first thing in the morning for 3 days and average the readings.

  3. Select your Training Intensity, Light for warm-ups and recovery, Moderate for aerobic base building, Vigorous for cardio improvement, Maximum for HIIT and sprint intervals.

  4. Read your Target Zone, the Min and Max bpm values are your training targets. Use a heart rate monitor to stay in range during your session.

Formula & Methodology

Maximum Heart Rate (Tanaka, 2001):

HRmax = 208 − 0.7 × Age

Heart Rate Reserve:

HRR = HRmax − Resting Heart Rate

Target Heart Rate (Karvonen):

THR = Resting HR + (HRR × Intensity%)

For a zone, calculate at the lower and upper intensity bounds.

Intensity zones:
- Light: 50–60% of HRR
- Moderate: 60–70% of HRR
- Vigorous: 70–85% of HRR
- Maximum: 85–95% of HRR

Worked example:

35-year-old, resting HR 68 bpm, training intensity: Vigorous (70–85%).

- HRmax = 208 − 0.7 × 35 = 183.5 ≈ 184 bpm
- HRR = 184 − 68 = 116 bpm
- Target Min = 68 + (116 × 70%) = 68 + 81 = 149 bpm
- Target Max = 68 + (116 × 85%) = 68 + 99 = 167 bpm
- Training Zone: 149–167 bpm

Track your cardiovascular progress monthly by checking whether your resting heart rate has decreased, a lower resting HR at the same age means a larger HRR and a more powerful cardiovascular system. Pair heart rate tracking with the BMR Calculator to see how improved fitness affects your resting metabolic rate over time.

Frequently Asked Questions

A target heart rate calculator uses your age and resting heart rate to compute the ideal heart rate range for your chosen training intensity. It applies the Karvonen formula, which personalises the zone based on your Heart Rate Reserve (the difference between your maximum and resting heart rate), to produce a min–max bpm range for your workout. Training within this zone ensures your cardiovascular system is stressed at the right level to produce adaptation.
The Karvonen formula is: Target HR = Resting HR + (Heart Rate Reserve × Intensity%). Where Heart Rate Reserve (HRR) = Max HR − Resting HR, and Max HR is estimated as 208 − 0.7 × Age (Tanaka formula). This formula is more accurate than simple percentage-of-max methods because it accounts for your individual resting heart rate, a lower resting HR (better fitness) results in a lower target zone, which is physiologically appropriate.
The simple percentage method sets your target heart rate as a fixed percentage of your maximum heart rate (e.g. 70% of Max HR). The Karvonen method uses Heart Rate Reserve, it calculates 70% of the gap between resting and max HR, then adds the resting HR back. Karvonen is more personalised: a highly fit person with a resting HR of 45 bpm will have a different (and physiologically correct) target zone than an unfit person with a resting HR of 80 bpm, even at the same age.
Maximum heart rate (HRmax) is the highest number of beats per minute your heart can reach during maximal exertion. This calculator uses the Tanaka formula: HRmax = 208 − 0.7 × Age, which is more accurate than the older 220 − Age formula, particularly for older adults. For a 30-year-old, Tanaka gives 187 bpm vs 190 bpm from the old formula, a small difference, but Tanaka's formula has been validated in larger, more diverse populations.
Heart Rate Reserve is the difference between your maximum heart rate and your resting heart rate. It represents the 'usable range' of your cardiovascular system during exercise. A larger HRR indicates better cardiovascular fitness, highly trained athletes often have resting heart rates of 40–50 bpm, giving them a larger reserve and a wider training zone. The Karvonen formula expresses training intensity as a percentage of this reserve.
The Light intensity zone (50–60% of HRR) is traditionally called the 'fat burning zone' because at lower intensities, fat contributes a higher proportion of fuel relative to carbohydrates. However, higher-intensity zones burn more total calories per minute, resulting in greater absolute fat burn even if the fat percentage is lower. For maximum fat loss, training in the Moderate (60–70%) to Vigorous (70–85%) zones and creating an overall calorie deficit is more effective.
A normal resting heart rate for adults is 60–100 beats per minute. Athletes and physically active individuals often have resting rates of 40–60 bpm. Resting heart rate above 90 bpm may indicate poor cardiovascular fitness or a health condition and warrants attention. Measure your resting heart rate first thing in the morning, before getting out of bed, by counting beats for 60 seconds or using a pulse oximeter.
Measure resting heart rate in the morning before rising from bed, after at least 5 minutes of stillness. Place two fingers on your wrist (radial pulse) or neck (carotid pulse) and count beats for 60 seconds, or count for 15 seconds and multiply by 4. Avoid measuring after caffeine, meals, or activity, as all of these temporarily elevate heart rate. Take readings on 3–4 consecutive mornings and average them for the most accurate baseline.
The Vigorous zone (70–85% of HRR) is the primary cardio training zone where you work hard enough to improve VO₂ max and cardiovascular efficiency. At this intensity, breathing becomes heavy and holding a conversation is difficult. For a 30-year-old with a resting HR of 65 bpm, the vigorous zone is approximately 149–166 bpm. Training in this zone 2–3 times per week produces significant improvements in aerobic fitness.
Brief excursions to near-maximum heart rate during HIIT or sprint training are safe for healthy adults who have built up fitness gradually. Sustained training at maximum heart rate is physiologically impossible, your body will slow you down. For older adults, those with cardiovascular disease, hypertension, or who are new to exercise, always consult a doctor before training above the Moderate zone. Start with Light to Moderate intensity and progress over weeks.
Higher heart rate during exercise generally correlates with higher calorie burn, your cardiovascular system is working harder, consuming more oxygen and energy. A 30-minute run in the Vigorous zone burns significantly more calories than the same time walking in the Light zone. Use our [Calories Burned Calculator](/calories-burned-calculator/) to estimate actual calorie burn by activity, then use the Target Heart Rate Calculator to ensure you are training at the right intensity for your goal.
Also known as
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