Heart Rate Zone Calculator

Use this Heart Rate Zone Calculator to estimate five personalized training ranges, including your Zone 2 heart rate, from age and optional resting heart rate. Select running, cycling, or general cardio, compare the age-based and Karvonen methods, and review every result in beats per minute (BPM). The ranges are educational starting points rather than measured limits or medical advice.

What Are Heart Rate Zones and Why They Matter

Heart rate zones divide exercise intensity into five ranges, from easy recovery work to short maximum-effort intervals. They can help runners, cyclists, and everyday exercisers plan easier and harder sessions without relying on pace alone. Zone 1 is commonly used for recovery, Zone 2 for steady aerobic base work, Zone 3 for moderate aerobic training, Zone 4 for threshold efforts, and Zone 5 for brief high-intensity work.

The American Heart Association describes target heart rates as general guides and notes that maximum heart rate is commonly estimated with 220 minus age. It places moderate activity at roughly 50–70% and vigorous activity at roughly 70–85% of maximum heart rate. A five-zone model divides that wider range into smaller training bands, but an age formula remains a population estimate rather than a direct measurement of your personal maximum.

How to Calculate Zone 2 Heart Rate

To calculate Zone 2 heart rate with the age-based method, first estimate maximum heart rate as 220 minus age. Multiply that result by 60% for the lower boundary and 70% for the upper boundary. For a 35-year-old, estimated maximum heart rate is 185 BPM, so the age-based Zone 2 estimate is approximately 111–130 BPM.

The calculator performs that calculation instantly and shows Zone 1 through Zone 5 together. This makes it easier to see how your Zone 2 heart rate fits within the full training plan instead of treating one range as an isolated number.

Calculating Zone 2 Heart Rate with the Karvonen Method

The Karvonen method uses heart-rate reserve, which is estimated maximum heart rate minus resting heart rate. Each target is calculated as resting heart rate plus a percentage of that reserve. Because it includes resting heart rate, the result can be more individualized than age alone, although it is still an estimate and depends on accurate inputs.

For the clearest resting reading, measure your pulse while calm and rested, often before getting out of bed. Enter that value and select Karvonen. If medication, illness, temperature, pregnancy, altitude, or a health condition affects your pulse, ask a qualified clinician which training targets are appropriate.

Heart Rate Training Zone Calculator for All Activities

This heart rate training zone calculator supports running, cycling, and general cardio. The activity selector adds useful training context while preserving a transparent formula. It does not silently subtract an arbitrary number from cycling zones because heart-rate differences between sports vary by person, position, fitness, and testing method.

Use BPM alongside perceived effort and the talk test. Zone 2 should generally feel sustainable and conversational for many people, but estimated boundaries can be too high or too low for an individual. Do not force intensity simply to match a displayed number.

Heart Rate Zone Calculator for Cycling

A cycling heart rate zone calculator can help organize endurance rides, tempo sessions, threshold intervals, and recovery days. Some cyclists observe a lower heart rate on the bike than while running, but the difference is not universal. A cycling-specific measured maximum or threshold test, performed appropriately, can provide better sport-specific data than applying a fixed adjustment.

Start with the displayed range, compare it with breathing and perceived effort, and update a wearable or training app only when you understand which maximum-heart-rate and resting-heart-rate settings it uses.

Age-Based versus Resting Heart Rate Zones

Age-based calculation is fast and needs only one input. Karvonen uses resting heart rate and heart-rate reserve, so two people of the same age can receive different training ranges. Neither method directly measures maximum heart rate, and neither should be presented as a diagnosis, exercise clearance, or guarantee of fitness.

Resting heart rate can vary with sleep, stress, hydration, caffeine, fitness, illness, and medication. Use a representative calm reading rather than a temporary high or low value. Recalculate when your resting rate changes meaningfully over time.

Garmin, Apple Watch, and Strava Heart Rate Zones

Wearables and apps may not exactly match this calculator. Apple Watch uses five zones, automatically personalizes them from Health data, and allows manual editing. Strava estimates maximum heart rate with 220 minus age by default and supports custom zones. Garmin devices also support heart-rate-zone customization, with available settings varying by device.

Before comparing Garmin, Apple Watch, or Strava heart rate zones, confirm that the same maximum heart rate, resting heart rate, percentage boundaries, and sport profile are selected. Different inputs or methods naturally produce different BPM ranges.

How to Use Heart Rate Zones Safely

Begin conservatively, especially if you are new to exercise or returning after a break. Warm up and cool down, increase training load gradually, and reserve Zones 4 and 5 for planned hard sessions with adequate recovery. Zone 2 is commonly used for steady aerobic endurance and is sometimes called the fat-burn zone, but losing body fat still depends on overall energy balance rather than a single heart-rate range.

Stop exercising and seek appropriate medical help for chest pain, fainting, severe breathlessness, or other concerning symptoms. People with cardiovascular conditions, pregnancy, major health concerns, or medicines that affect heart rate should get individualized advice before using formula-based targets.