Karvonen Method: Heart Rate Training Zones Calculator

The Karvonen Method works out your heart rate training zones by taking a percentage of your heart rate reserve (your maximum heart rate minus your resting heart rate) and adding your resting heart rate back on, so the zones are personal to you instead of a one-size-fits-all guess. Below: who Martti Karvonen was, how heart rate reserve works, the five training zones from recovery to hard intervals, a worked calculation for each zone, how to find your maximum and resting heart rates, how the method compares with the Maffetone method, common mistakes, when to ignore your heart rate monitor, a zone calculator, how to load your zones onto a GPS watch, and answers to common questions.

Most runners who train by heart rate get their zones wrong before they take a single step, because the simple "220 minus your age" formula ignores resting heart rate completely. I've watched countless runners train too hard or too easy off those numbers. I use this method in my own training and recommend it to the runners I coach, and it's a game-changer if you have a particularly low or high resting rate.

Who Was Martti Karvonen?

Martti Karvonen was a Finnish exercise physiologist who revolutionized heart rate training in the 1950s. His insight was brilliant yet simple.

Your resting heart rate matters just as much as your maximum heart rate when determining training zones. That insight became the Karvonen Formula.

Understanding Heart Rate Reserve

Heart rate reserve (HRR) is the foundation of this method. It's the difference between your maximum heart rate and your resting heart rate.

Here's the formula: Heart Rate Reserve = Maximum Heart Rate - Resting Heart Rate

Let's say your maximum heart rate is 195 beats per minute (bpm) and your resting heart rate is 50 bpm. Your heart rate reserve would be 145 bpm (195 - 50 = 145).

This number becomes the basis for all your zone calculations.

The Five Karvonen Training Zones

I divide training into five distinct zones using percentages of your heart rate reserve:

• Zone 1: 60-70% (Recovery and base building)
• Zone 2: 70-75% (Easy aerobic runs)
• Zone 2.5: 75-80% (Steady state/tempo)
• Zone 3: 80-85% (Lactate threshold/tempo)
• Zone 4: 85-95% (maximal oxygen uptake (VO2 max) intervals)

Zone 1: Recovery and Long Slow Distance

Zone 1 is for your long, slow runs and recovery runs. You'll hold full conversations here easily.

Use Zone 1 for recovery runs the day after hard workouts. Most of your long runs during base building belong here too. Many runners make the mistake of running too hard in this zone — resist that temptation.

Zone 2: Easy Aerobic Running

Zone 2 is where you'll spend most of your training time. This is comfortable aerobic running where you can still chat, but not quite as easily as Zone 1.

Your daily easy runs fall here. I tell my runners that if you feel like you could run faster at the end or keep going indefinitely, you've nailed the effort. You can find common challenges with this in the Zone 2 running guide.

Zone 2.5: Steady State Running

I created Zone 2.5 on this website because the experts had forgotten about the bottom of Zone 3 for a couple of decades. When you go a bit faster than easy and you are not yet at your lactate threshold, magic happens. Thanks to Norwegian training methods, such as those advocated by Marius Bakken and the Norwegian singles approach as popularised by James Copeland, this zone has found its way back into the running theory.

You'll run at a "comfortably hard" pace — harder than easy pace, but not quite tempo effort. Think of it as steady-state pace.

Steady state runs are valuable for any aerobic distance from 5k up to half marathon and marathon preparation. But I think especially for half marathon preparation it's a great zone to get familiar with. These steady state runs bridge the gap between easy running and true tempo work beautifully.

Zone 3: Tempo/Threshold Running

Zone 3 is your lactate threshold zone. This is the effort you could theoretically hold for about an hour in a race.

You'll breathe harder here, but you'll still feel controlled. This is "comfortably hard" effort — you're working, but not gasping for air. You can find more detailed guidance in the tempo running article.

Zone 4: VO2 Max Intervals

Zone 4 is hard interval running territory. You're working at 5K pace or faster.

These sessions hurt, but they're incredibly effective for improving your speed and race performance. Typical workouts include 3-8 minute intervals in this zone.

How to Calculate Your Karvonen Zones

The calculation is straightforward once you know your numbers:

Target Heart Rate = Resting HR + (Percentage × Heart Rate Reserve)

Let me walk you through a complete example using my earlier numbers (max HR 195, resting HR 50, HRR 145):

Zone 1 Calculation (60-70%)

• Low end: 50 + (0.60 × 145) = 137 bpm
• High end: 50 + (0.70 × 145) = 152 bpm

Zone 2 Calculation (70-75%)

• Low end: 50 + (0.70 × 145) = 152 bpm
• High end: 50 + (0.75 × 145) = 159 bpm

Zone 2.5 Calculation (75-80%)

• Low end: 50 + (0.75 × 145) = 159 bpm
• High end: 50 + (0.80 × 145) = 166 bpm

Zone 3 Calculation (80-85%)

• Low end: 50 + (0.80 × 145) = 166 bpm
• High end: 50 + (0.85 × 145) = 173 bpm

Zone 4 Calculation (85-95%)

• Low end: 50 + (0.85 × 145) = 173 bpm
• High end: 50 + (0.95 × 145) = 188 bpm

Compare these to values identified by other methods such as the Zoladz approach.

Finding Your Maximum Heart Rate

You need an accurate maximum heart rate for the Karvonen Method to work properly. The old "220 minus your age" formula isn't reliable enough.

I recommend a field test. After a good warm-up, run progressively harder every 30 seconds until you can't go any faster. The highest number you see is your maximum heart rate value — establish your maximum heart rate properly rather than guessing.

Do this test when you're well-rested and motivated. It's uncomfortable, but the data you get is invaluable.

Measuring Your Resting Heart Rate

Take your resting heart rate first thing in the morning, before you get out of bed — establish your rest heart rate properly rather than guessing.

Measure it for several consecutive mornings and use the average. Your resting heart rate fluctuates based on stress, illness, and training load, so consistency in timing matters.

Resting heart rates range anywhere from the low 40s (in very fit endurance athletes) to the 70s and beyond. There's no "wrong" number — it's just your starting point.

Karvonen Method vs Maffetone Method

The Maffetone Method takes a completely different approach. Instead of multiple zones, Phil Maffetone advocates training primarily at "180 minus your age" (with some adjustments).

Both methods are widely used by runners. The Karvonen Method gives you more flexibility and precision for different types of training. The Maffetone Method is simpler and focuses heavily on aerobic base building.

Nothing's wrong with the Maffetone Method. However, when you enjoy structured training with variety, the Karvonen approach is what you'll want to use. It allows you to target specific physiological adaptations more effectively.

Common Mistakes with Heart Rate Zone Training

The biggest mistake is getting obsessed with hitting exact heart rate numbers during every run. Heart rate lags behind effort changes, especially at the start of runs.

Heat, humidity, caffeine, stress, and sleep quality all affect your heart rate. Use the zones as guides, not absolute rules. Err on the side of caution.

Check your heart rate periodically during runs, but focus more on perceived effort. The heart rate data confirms you're in the right ballpark.

When to Ignore Your Heart Rate Monitor

Sometimes you need to run by feel instead of heart rate. During the first few minutes of any run, your heart rate is still catching up to your effort level.

I often find my heart rate monitor doesn't work well in the first 5-10 minutes. Once I start producing sweat, the contact between skin and chest strap improves and readings become more accurate.

On very hot days, your heart rate runs higher for the same effort. Focus on perceived effort and let the heart rate be what it is. During races, especially shorter ones, you might run above your calculated zones. That's fine — racing is about performance, not staying in predetermined ranges.

Making the Most of Your Heart Rate Data

The real value in heart rate training isn't just following zones during workouts. It's in the patterns you see over time.

As your fitness improves, you'll run faster at the same heart rate. Your heart rate will recover more quickly between intervals.

This data helps gauge fitness progression and spot early signs of overtraining. Consistently elevated resting heart rate or slower recovery between intervals signals you need more recovery.

Programming Your Training Zones

A well-structured training programme uses all these zones strategically. I recommend about 80% of your mileage in Zones 1 and 2.

Distribute the remaining 20% across the higher zones based on your goals and training phase. Marathon training emphasises more Zone 2.5 and Zone 3 work. 5K training includes more focus on Zone 4 intervals.

The Karvonen Heart Rate Zone Calculator

Now, just sensing that you'd rather not do the above calculations yourself, I have created the below calculator. All you do is enter your maximum heart rate and rest heart rate.

Then click the "click me"-button and there are your heart rate monitor training zones!

Enter your maximum heart rate
Enter your rest heart rate
Press the button, don't click Enter
Zone 1 :	to
Zone 2 :	to
Zone 2 1/2 :	to
Zone 3 :	to
Zone 4 :	to
Zone 5 :	to

Loading Your Zones Onto a GPS Watch

Once you've got your five zones calculated, you don't want to be doing mental arithmetic mid-run. Most modern global positioning system (GPS) watches — Garmin, Coros, Polar and Apple Watch included — let you enter your own custom heart rate zones rather than relying on the device's built-in estimate.

Here's where that setting typically lives:

• On Garmin, open User Profile > Heart Rate & Power Zones in the watch settings and set the zones to be based on BPM before entering your five Karvonen boundaries (or choose %HRR and enter your max and rest heart rate).
• On Coros and Polar, it usually sits under Training Zones or Sport Profiles — look for a manual or custom entry option.
• On Apple Watch, custom zones live under Workout > Heart Rate Zones, in the Settings app on the watch or the Watch app on your iPhone. Choose Manual.

Beware: a watch's own "estimated" zones are calculated using its own formula, not the Karvonen Method. Enter your numbers manually, or the zone alerts buzzing on your wrist won't match the numbers this page just gave you.
Keep in mind that training based on heart rate is very useful, but these zones provide you with a framework. We're all unique, so use the zones with some care. Learn to listen to your body and how hard a workout feels, rather than following the numbers like a slave!

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