Heart Rate Zone Calculator
Calculate your training heart rate zones based on age and resting heart rate.
What is Max Heart Rate?
Maximum heart rate (MHR) is the highest number of beats per minute your heart can achieve during maximum physical exertion. It’s used as a baseline to calculate training zones.
The most common formula is 220 minus your age, but the Tanaka formula (208 – 0.7 × age) is considered more accurate for adults based on research.
Understanding the 5 Zones
- Zone 1 (50-60%): Recovery zone. Very light effort. Good for warm-up, cool-down, and active recovery days.
- Zone 2 (60-70%): Fat-burning zone. Light effort. Builds aerobic base and endurance. You can hold a conversation easily.
- Zone 3 (70-80%): Aerobic zone. Moderate effort. Improves cardiovascular fitness. Breathing becomes harder.
- Zone 4 (80-90%): Threshold zone. Hard effort. Increases speed and lactate threshold. Sustainable for 20-60 minutes.
- Zone 5 (90-100%): Maximum zone. All-out effort. Improves sprint power. Only sustainable for short bursts.
Training Tips by Goal
- Weight loss: Spend most time in Zone 2-3. Higher zones burn more calories per minute but are harder to sustain.
- Endurance: 80% of training should be in Zone 2 (easy pace). This builds aerobic base without overtraining.
- Speed/Performance: Include Zone 4-5 intervals 1-2x per week. Always follow with recovery days.
- General fitness: Mix zones throughout the week. Variety prevents plateaus and keeps workouts interesting.
Important Considerations
- Individual variation: These formulas provide estimates. Your actual max HR may be higher or lower by 10-15 bpm.
- Medications: Beta blockers and some medications affect heart rate. Consult your doctor if taking any.
- Fitness level: Well-trained athletes often have lower resting HR and may have different zone responses.
- Listen to your body: Heart rate is just one metric. Pay attention to perceived exertion and how you feel.
Frequently Asked Questions
How do I calculate my maximum heart rate for exercise zones?
The standard formula is 220 minus your age. The calculator also offers the Tanaka formula (208 − 0.7 × age), which research suggests is more accurate for older adults. Individual maximum heart rate can vary by ±10–15 bpm from any formula. The most accurate way to find your true max HR is a graded exercise stress test, not a formula.
What is the Karvonen method for heart rate zones?
The Karvonen method factors in your resting heart rate to calculate heart rate reserve (max HR minus resting HR), then computes training zones as a percentage of that reserve added back to resting HR. Because it accounts for your individual fitness baseline, it typically yields more personalized zone targets than simple percentage-of-max formulas. It requires entering your resting heart rate in the calculator.
What does Zone 2 fat-burning heart rate mean?
Zone 2 (60–70% of max HR) is often called the fat-burning zone because at this intensity the body relies more heavily on fat as a fuel source relative to carbohydrates. However, higher-intensity zones burn more total calories per minute even though the fat percentage is lower. Zone 2 is also excellent for building aerobic base and cardiovascular endurance.
Is the 220 minus age formula accurate for everyone?
The 220 − age formula is a population average with significant individual variation. At any given age, individual maximum heart rates can differ by ±10–15 bpm from the formula prediction. Older adults and women tend to be underestimated by this formula. The Tanaka formula (208 − 0.7 × age) was derived from a larger dataset and may be more accurate, especially for people over 40.
How do I find my resting heart rate to use the Karvonen method?
Measure your resting heart rate first thing in the morning before getting out of bed. Count your pulse for 60 seconds — or count for 15 seconds and multiply by 4. A typical resting heart rate for adults is 60–100 bpm, and well-trained athletes often fall between 40–60 bpm. Take the measurement on multiple mornings and use the average for the most reliable input.