Heart Rate Zone Calculator — Karvonen Method

Generic zones are written for the average person your age. Are you average?

Use this target heart rate calculator to find your personalized training zones.

Your resting heart rate is best measured first thing in the morning. It only takes 60 seconds and makes your zones significantly more accurate.

1
Wake up naturally
Before your alarm goes off if possible. Avoid caffeine, stress, or sudden movement — these all raise your HR temporarily.
2
Stay lying down
Don't sit up or get out of bed yet. Place two fingers lightly on the side of your neck or the inside of your wrist.
3
Count for 60 seconds
Count each beat for a full minute. That number is your resting heart rate in bpm. Most adults fall between 50–80 bpm.
4
Enter it above & calculate
Plug your number into the Resting HR field for zones tailored precisely to your cardiovascular fitness.
💡 No measurement yet? Leave the field blank — we'll use 60 bpm as a reasonable starting estimate. Come back tomorrow morning with your real number for personalised zones.
Max heart rate
—bpm
Heart rate reserve
—bpm
Your training zones
Log today's resting HR — track how your fitness improves week over week Recalculate with different inputs

Which Zone is for You?

Your goal determines your zone. Pick the one that matches where you are and what you're working toward.

🔥
The Weight Loss Seeker

Burn fat, not willpower

● Zone 2 · 60–70%

Most people run too hard and wonder why the scale won't budge. Zone 2 is where fat is your primary fuel — not carbs. That means longer sessions without the crash, and less recovery needed between them.

→ Keep it conversational. If you can't hold a sentence, slow down.
🚴
The Weekend Warrior

Build the engine, race the car

● Zone 2–3 · 60–80%

You've got a 10K, a sportive, or a charity ride coming up. You don't need to train like a pro — you need to be consistent. Mix Zones 2 and 3 to build a solid aerobic base and sharpen your endurance without wrecking your weekdays.

→ 80% Zone 2, 20% Zone 3 is the proven split for event prep.
🏆
The Performance Athlete

Break ceilings, not just records

● Zone 4 · 80–90%

Zone 4 is where lactate threshold improvements happen. Intervals here push the ceiling higher — the pace that used to wreck you gradually becomes something you can sustain. It's specific, hard work with a measurable payoff.

→ Limit Zone 4 to 1–2 sessions per week — more than that and recovery becomes the limiting factor.
Not sure where to start? Four weeks in Zone 2. It builds the aerobic base that makes every other zone more effective — and it's where elite athletes spend most of their time.

What is the Karvonen Formula?

The Karvonen method (also called the Heart Rate Reserve method) calculates your target training zones more accurately than the simple percentage-of-max approach because it factors in your individual resting heart rate.

Target HR = Resting HR + (Intensity% × (Max HR − Resting HR))
Max HR = 220 − Age
Heart Rate Reserve (HRR) = Max HR − Resting HR

Prefer age-based zones without resting HR input? The Tanaka formula calculator is more accurate than 220-minus-age, especially after 40. Women have a dedicated option in the Gulati formula calculator, derived from 5,437 female subjects. The 220-minus-age calculator is also available if that's what you need.

Understanding Your Zones

Zone 1 (50–60%)

Active recovery and warm-up. Very easy effort, ideal for rest days and building aerobic foundation.

Zone 2 (60–70%)

Aerobic base building and fat burning. The "conversational" pace. Most of your training should be here. Why Zone 2 is your fat-burning zone →

Zone 3 (70–80%)

Aerobic endurance. Moderate effort that improves cardiovascular efficiency and stamina.

Zone 4 (80–90%)

Lactate threshold training. Hard, sustainable effort that raises your anaerobic threshold over time.

Zone 5 (90–100%)

Maximum effort. Short, all-out intervals for peak speed and power. Use sparingly.

Why Use the Karvonen Formula?

Most heart rate calculators give everyone the same zones. The Karvonen method gives you yours — calibrated to your actual cardiovascular fitness, not just your age.

🎯

Precision over guesswork

By factoring in your resting heart rate, Karvonen zones shift as you get fitter — so your Zone 2 run stays genuinely easy, not secretly hard.

🔥

Maximize fat burning

Most people train too hard on easy days and not hard enough on hard days. A personalized Zone 2 keeps your easy runs actually easy — and your fat-burning window open.

💪

Protect your recovery

Generic calculators routinely prescribe Zone 3 as "easy." For a fit athlete with a low resting HR, that's overtraining. Karvonen keeps easy days actually easy.

📈

Track real progress

As your cardiovascular fitness improves, your resting HR drops. Recalculate monthly and watch your zones shift — a built-in progress metric that doesn't lie.

Karvonen Method

Heart Rate Reserve

  • Accounts for resting HR
  • Adapts as you get fitter
  • Reflects true cardiovascular load
  • Used by coaches & sports scientists
Simple % of Max HR

Age-Only Formula

  • Ignores individual fitness
  • Static — never updates
  • Same zones for everyone
  • Up to 15 bpm off for fit athletes

220-minus-age calculator → · Tanaka calculator →

Who benefits most?

🏃 Runners 🚴 Cyclists 🏊 Triathletes 🏋️ Strength athletes ❤️ Cardiac rehab patients 🧘 Anyone wearing a HR monitor 📉 Weight loss seekers 🩺 Longevity-focused individuals
Your Fitness Progress
Log your resting HR weekly — watch your heart get stronger

What was your resting heart rate this morning?

Frequently Asked Questions

Common questions about training zones and how to use them.

A healthy resting heart rate for adults is 60–100 bpm. Athletes and highly fit individuals often see 40–60 bpm. A lower resting heart rate generally indicates more efficient heart function and better cardiovascular fitness. Check yours every Monday morning — watching it drop over weeks is one of the most motivating metrics in fitness.
Zone 2 is low-intensity aerobic exercise at 60–70% of your heart rate reserve. You can hold a full conversation at this pace. It's popular because it maximizes fat oxidation, builds mitochondrial density, and improves cardiovascular efficiency without generating the recovery debt of harder zones. Elite endurance athletes spend roughly 80% of their total training time in Zone 2.
The Karvonen formula uses your Heart Rate Reserve (HRR) — the difference between your max and resting heart rate — to calculate personalized zones: Target HR = Resting HR + (Intensity% × HRR). Because it incorporates your resting HR, a fit person with a low resting HR gets different zones than an unfit person of the same age, making it significantly more accurate than simple age-based formulas.
The most common formula is Max HR = 220 − Age. A 35-year-old has an estimated max HR of 185 bpm. This is a population average — actual max HR can vary ±10–15 bpm between individuals. For precise training, a supervised graded exercise test gives the most accurate result, but the 220−Age formula is reliable enough for training zone estimation.
Measure it first thing in the morning before getting out of bed. Place two fingers on the side of your neck or inside your wrist. Count beats for 60 seconds. Repeat for 3 consecutive days and average the results. Avoid caffeine, alcohol, or intense exercise the night before. Most modern fitness watches can measure it automatically during sleep for even more accuracy.
Zone 2 (60–70% HRR) produces the highest rate of fat oxidation. Your body relies primarily on fat as fuel at this intensity rather than carbohydrates. While higher-intensity zones burn more total calories per minute, Zone 2's sustainable nature allows for longer sessions — meaning more total fat burned per workout. It's also far less taxing on your recovery, so you can do more of it. How to use Zone 2 for fat loss →
Recalculate every 4–6 weeks, or whenever your resting heart rate changes by 3+ bpm. As cardiovascular fitness improves, your resting HR drops — and your zones shift to match. A 45-year-old who drops their resting HR from 72 to 58 bpm over 6 months will have meaningfully different training zones. It's one of the few fitness metrics that doesn't lie.
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