A heart rate zone calculator tells you your maximum heart rate and sets your personal training zones, so you can train smarter. This guide explains what those zones are, how they’re calculated, and why they stop you from working too hard or not hard enough.
What heart rate zones actually are
Heart rate zones are five ranges that show how hard your body’s working, from easy recovery up to full effort. Each zone is a percentage of your maximum heart rate, so zone 2 feels steady and you can still talk, while zone 5 is unsustainable beyond a few minutes.
The numbers come from lab tests on thousands of people, then boiled down into the standard five-zone model. Your maximum heart rate isn’t based on age (the old 220 minus age rule is just a rough estimate), so the best way to find it is a proper ramp test or a max-effort session with a chest strap.
Take someone whose test shows a max heart rate of 185 beats per minute. Zone 2 for them is 60–70% of 185, so 111 to 130 bpm. If they run at 124 bpm, they’re right in the middle of zone 2, which is ideal for building aerobic fitness without wiping themselves out.
The edges get fuzzy because some coaches split it into six or seven zones, others set them by lactate levels instead of heart rate. Women sometimes get lower cut-offs in certain systems, and altitude throws off heart rate accuracy, so don’t take the numbers as absolute truth.
Work them out by hand
- Enter your age.
- Optionally add your resting heart rate for more personal zones.
- See your max heart rate and four training zones in beats per minute.
Max HR = 220 − age. Karvonen zone = (Max − Resting) × intensity + RestingHeart Rate Zones by Training Intensity
| Zone | Percentage of Max Heart Rate | Activity / Benefit |
|---|---|---|
| Zone 1 (Very Light) | 50-60% | Warm-up, recovery, gentle exercise |
| Zone 2 (Light) | 60-70% | Fat-burning, endurance base building |
| Zone 3 (Moderate) | 70-80% | Aerobic fitness, improving stamina |
| Zone 4 (Hard) | 80-90% | Improving VO2 max, cardiovascular efficiency |
| Zone 5 (Maximum) | 90-100% | Short bursts, sprinting, high-intensity intervals |
Why guessing your zones hurts your training
Train in the wrong zone and you’ll either slog through endless miles that don’t make you fitter, or push too hard and end up injured. A runner who thinks 160 bpm is always ‘hard’ will burn out in weeks, while someone who avoids anything above 140 bpm will never build speed. The zones remove the guesswork. With your bands set, a 20-minute easy run stays easy, a hill session stays hard, and long rides won’t leave you wrecked the next day.
Where people go wrong
| Common mistake | What to do instead |
|---|---|
| Using 220 minus age for max heart rate | It’s a rough guess that can be 10 bpm out. Use a proper ramp test or a max-effort session with a chest strap instead. |
| Ignoring resting heart rate drift | If you’re ill or overtrained, your resting rate creeps up. Check it daily and adjust zones if it’s 5 bpm higher than normal for two days running. |
| Mixing bpm and percentage points | Lowering zone 2 from 65% to 60% isn’t the same as dropping 5 bpm. Recalculate the whole band so you don’t drift into zone 1 by accident. |
Use our free calculator as a shortcut
| Tool | What it does |
|---|---|
| Heart Rate Zone Calculator | Find your maximum heart rate and personal training zones for smarter workouts. |
| Pace Calculator | Find your running pace per kilometre and average speed. |
Try the Heart Rate Zone Calculator
Skip the manual maths — enter your numbers and get the answer instantly.
Open the Heart Rate Zone Calculator →A quick check before you trust the numbers
Remember that these figures are general guides, not medical advice. Bodies differ, so treat the result as a starting point and speak to a qualified professional before making decisions about your health.
What to remember when you close this page
- Use a proper max test, not age, to set zones
- Check resting heart rate daily and adjust if it drifts
- Stick to the maths, don’t round mid-calculation
Questions fréquentes
Is 220 − age exact?
No, it’s a population average and can be off by 10–20 beats for any individual. A lab test gives your true number, but the formula is fine for everyday training.
What is the fat-burning zone?
Roughly 60–70% of max heart rate. You burn a higher share of fat here, but higher-intensity work burns more total calories — both have their place.
How do I measure resting heart rate?
Count your pulse for 60 seconds first thing in the morning before getting up, or read it from a fitness tracker after lying still.
