Health & Fitness
Heart Rate Calculator – Check Your Target Heart Rate
Use our free Heart Rate Calculator to find your target heart rate zones for exercise and fitness. Improve workouts and monitor your heart health easily.
Why Calculate Your Target Heart Rate?
Your target heart rate (THR) is the ideal range of heartbeats per minute during exercise to achieve specific fitness goals. Training in the right zone maximizes benefits — Zone 2 (60–70%) builds endurance and burns fat, while Zone 4 (80–90%) improves speed and lactate threshold.
This calculator uses two methods: the simple method (Max HR = 220 − age) and the more accurate Karvonen method, which factors in your resting heart rate: THR = ((Max HR − Resting HR) × Intensity%) + Resting HR. Enter your age and optionally your resting heart rate for personalized zones.
Heart Rate Training Zones Explained
| Zone | Intensity | Purpose | Feel | Duration |
|---|---|---|---|---|
| Zone 1 | 50–60% | Active Recovery | Very easy, can talk freely | 30–60+ min |
| Zone 2 | 60–70% | Base Endurance / Fat Burn | Comfortable, conversational | 30–90+ min |
| Zone 3 | 70–80% | Aerobic Fitness | Moderate, talking is harder | 20–60 min |
| Zone 4 | 80–90% | Lactate Threshold | Hard, short phrases only | 10–30 min |
| Zone 5 | 90–100% | Max Power / VO2 Max | All-out, can't talk | 30 sec–5 min |
Resting Heart Rate by Fitness Level
| Fitness Level | RHR (bpm) | Rating |
|---|---|---|
| Elite Athlete | 40–50 | Excellent |
| Very Fit | 50–60 | Very Good |
| Fit / Active | 60–70 | Good |
| Average | 70–80 | Average |
| Below Average | 80–90 | Fair |
| Sedentary | 90–100+ | Poor |
How to Measure Resting Heart Rate
- Measure first thing in the morning before getting out of bed
- Place two fingers on your wrist (radial artery) or neck (carotid artery)
- Count beats for 60 seconds, or count for 15 seconds and multiply by 4
- Measure for 3 consecutive mornings and take the average
- Avoid measuring after caffeine, alcohol, or stressful events
Estimated Maximum Heart Rate by Age
| Age | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Max HR | 200 | 195 | 190 | 185 | 180 | 175 | 170 | 165 | 160 | 155 | 150 |
| Zone 2 (60–70%) | 120–140 | 117–137 | 114–133 | 111–130 | 108–126 | 105–123 | 102–119 | 99–116 | 96–112 | 93–109 | 90–105 |
| Zone 4 (80–90%) | 160–180 | 156–176 | 152–171 | 148–167 | 144–162 | 140–158 | 136–153 | 132–149 | 128–144 | 124–140 | 120–135 |
Based on 220 − age formula. Individual max HR can vary ±10–15 bpm. These are estimates without resting HR adjustment (Karvonen).
FAQ – Heart Rate Calculator
What is target heart rate and why is it important?
Target heart rate is the ideal range of heartbeats per minute during exercise to achieve specific fitness goals. Training in Zone 2 (60–70%) builds endurance and burns fat, Zone 3 (70–80%) improves cardiovascular fitness, and Zone 4 (80–90%) increases speed and lactate threshold. Staying in the right zone helps you train effectively without overtraining.
How do I measure my resting heart rate?
Measure first thing in the morning before getting out of bed. Place two fingers on your wrist or neck and count beats for 60 seconds. Do this for 3 mornings and average the results. A typical resting heart rate is 60–80 bpm for adults. Athletes often have resting rates of 40–60 bpm due to a stronger, more efficient heart.
What is the Karvonen method?
The Karvonen method calculates target heart rate using your Heart Rate Reserve (HRR = Max HR − Resting HR). Formula: THR = (HRR × Intensity%) + Resting HR. It's more accurate than the simple percentage method because it accounts for your individual fitness level. A fit person with a low resting HR will get different zones than a sedentary person of the same age.
How accurate is the 220 minus age formula?
The 220 − age formula is a general estimate with a standard deviation of ±10–15 bpm. It works as a starting point for most people but can be significantly off for individuals. More accurate alternatives include the Tanaka formula (208 − 0.7 × age) and supervised max HR testing. If your calculated zones feel too easy or too hard, your actual max HR may differ.
Which heart rate zone is best for fat burning?
Zone 2 (60–70%) is called the "fat-burning zone" because your body uses a higher percentage of fat as fuel at lower intensities. However, higher-intensity zones burn more total calories per minute. For weight loss, total calorie expenditure matters most. A mix of Zone 2 (longer sessions) and Zone 4 (shorter, intense sessions) is most effective.
Can medications affect my heart rate zones?
Yes. Beta-blockers can lower both resting and maximum heart rate by 20–30 bpm, making standard formulas inaccurate. Other medications like stimulants, decongestants, and some antidepressants can raise heart rate. If you take any heart-affecting medication, consult your doctor for adjusted target zones or use the Rate of Perceived Exertion (RPE) scale instead.
How much time should I spend in each zone?
The 80/20 rule is widely recommended: spend 80% of training time in Zones 1–2 (easy/moderate) and 20% in Zones 3–5 (hard/intense). This polarized approach builds a strong aerobic base while allowing enough recovery. Beginners should spend even more time in Zones 1–2 until they build a fitness foundation.
What if my heart rate is too high during easy workouts?
Elevated heart rate during easy exercise can indicate dehydration, lack of sleep, stress, illness, overtraining, or heat. If it persists for more than a week, reduce training intensity and volume. A resting heart rate that's 5+ bpm above your normal baseline is a sign you need more recovery. Consult a doctor if it remains consistently elevated.
Do I need a heart rate monitor?
A heart rate monitor provides real-time feedback and helps you stay in target zones. Chest straps are most accurate (±1 bpm), while wrist-based optical sensors are convenient but less precise (±5–10 bpm), especially during high-intensity or wrist-bending activities. Alternatively, use the "talk test" — if you can't hold a conversation, you're likely in Zone 3+.
Does resting heart rate change with fitness?
Yes. Regular cardiovascular exercise strengthens the heart, allowing it to pump more blood per beat (higher stroke volume). This means fewer beats are needed at rest. A sedentary person might have a resting HR of 80+ bpm, while a trained runner might be at 50 bpm. Resting HR typically drops 1 bpm per week of consistent training in the first few months.