❤️Heart Rate Zone Calculator
Find your five training zones instantly. Enter your age for an estimated max heart rate, or override with a known value. Add your resting heart rate to enable the personalised Karvonen method.
This tool provides general information and is not medical advice. Exercise intensity should match your own fitness and health. Please consult a physician before starting a new exercise routine or training at high intensity—especially if you have any heart condition, injury, or health concern.
Free Heart Rate Zone Calculator Online
Want to train at the right intensity? Our free Heart Rate Zone Calculator maps out your personal training zones the moment you enter your age. As a fast and reliable heart rate zone calculator, it estimates your maximum heart rate and breaks it into the five standard training zones—each with its own beats-per-minute range—so you know exactly what to aim for during a workout.
But it does more than one number. Enter a known max heart rate instead of the age estimate for accuracy, add your resting heart rate to use the more personalised Karvonen method, and read a clear explanation of what each zone is for—from easy recovery to high-intensity effort. Whether you run, cycle, or train, your zones are all in one place.
Simply enter your age to see your zones instantly. No sign-up, no downloads, no limits—just clear results whenever you need them. Learn more in the FAQ or About pages.
About the Heart Rate Zone Calculator
Key features
Age-based max HR estimate
Enter your age and the tool instantly estimates your maximum heart rate using the 220 − age formula, then divides it into the five standard zones. No other input required.
Manual max HR override
If you know your measured maximum heart rate from a lab test or a maximal effort workout, enter it directly. The tool uses your value instead of the age estimate for more accurate zone boundaries.
Karvonen (heart-rate reserve) method
Provide your resting heart rate to enable the Karvonen method. This uses your heart-rate reserve — the difference between resting and max — to calculate zones that better reflect your individual fitness level.
Five zones with descriptions
Each of the five standard zones is shown with its percentage range, calculated BPM range, name, and a plain-English description of what that zone feels like and what it trains.
How the zones are calculated
Max HR from age
Max HR = 220 − age. This is a widely used population average; actual maximum heart rate varies between individuals, sometimes by 10–20 bpm.
% of Max HR (default)
Zone BPM = (zone percentage ÷ 100) × Max HR. Zones are 50–60%, 60–70%, 70–80%, 80–90%, and 90–100% of max HR.
Karvonen formula
Zone BPM = (zone percentage ÷ 100) × (Max HR − Resting HR) + Resting HR. Uses heart-rate reserve (HRR = Max HR − Resting HR) for a more individual result.
Zone boundaries
Zone 1: 50–60%. Zone 2: 60–70%. Zone 3: 70–80%. Zone 4: 80–90%. Zone 5: 90–100%. The top of each zone aligns exactly with the bottom of the next.
A note on accuracy and safety
Frequently Asked Questions
How does the heart rate zone calculator work?
Enter your age and the tool estimates your maximum heart rate using the 220 minus age formula, then divides it into the five standard training zones, showing the beats-per-minute range for each — no button refresh needed.
Is this calculator free to use?
Yes, it is completely free with no sign-up, downloads, or limits. Calculate your zones as often as you like.
How is maximum heart rate estimated?
By default it uses the common age-based formula (220 minus your age). This is a general estimate — if you know your actual measured max heart rate, you can enter it for more accurate zones.
What are the five heart rate zones?
They range from very light (Zone 1 — easy recovery effort, 50–60% of max HR) up to maximum (Zone 5 — very hard, short bursts, 90–100% of max HR), with light (Zone 2, fat-burning base), moderate (Zone 3, aerobic conditioning), and vigorous (Zone 4, anaerobic threshold) zones in between. Each zone corresponds to a percentage band of your maximum heart rate and serves a different training purpose.
What is the Karvonen method?
The Karvonen method uses your heart rate reserve — the gap between your resting and maximum heart rate — to calculate zones. The formula is: Zone BPM = (zone percentage × heart rate reserve) + resting heart rate. By entering your resting heart rate, you get zones tailored more closely to your individual cardiovascular fitness.
How do I find my resting heart rate?
Measure your pulse when you are fully at rest, ideally first thing in the morning before getting up and before any caffeine or physical activity. Count your heartbeats for 60 seconds, or count for 15 seconds and multiply by 4. For accuracy, measure over several days and use the average. Entering your resting heart rate enables the more personalised Karvonen calculation.
How accurate are these zones?
They are useful general guides. The 220 − age formula for maximum heart rate is a population average, and individuals can differ significantly — sometimes by 10–20 bpm. A directly measured maximum heart rate (from a supervised maximal effort test) will give more accurate zones. The Karvonen method, when used with true resting and maximum heart rate values, produces more personalised zones than the age formula alone.
Is my data stored anywhere?
No. Your inputs are processed directly in your browser and are never stored or sent to a server, keeping your information completely private.
Does it work on mobile devices?
Yes, the calculator is fully responsive and works on smartphones, tablets, and desktops without any installation.
Is it safe to train in higher heart rate zones?
Zone training is widely used by runners, cyclists, and athletes of all levels. However, training intensity should match your current fitness level and health status. Zone 4 and Zone 5 training puts significant stress on the cardiovascular system. If you have any heart condition, cardiovascular health concern, or are new to exercise, check with a doctor or qualified health professional before training at high intensity — this tool provides general information, not medical advice.