Target Heart Rate Calculator

Live %HRmax vs Karvonen zone board with a heart-rate reserve peel and full zone ladder so the two classroom formulas stay honest side by side.

Educational fitness literacy only. Not medical advice, exercise clearance, or a lab max HR test. Seek care for warning symptoms; people with heart disease need clinician guidance.

By Ahmet C. Toplutaş·Site owner & editor · Health tools

Last updated May 21, 2026 · Reviewed May 21, 2026 · Planning estimates only - not tax, medical, or investment advice

%HRmax and Karvonen on one board

Target heart-rate zones answer “how hard is this effort?” in beats per minute. Two common classroom methods disagree on purpose. Percent of HRmax scales estimated maximum heart rate. Karvonen uses heart-rate reserve (max minus resting) so a lower resting pulse shifts the same percent into a different BPM band.

This page’s framing is a %HRmax vs Karvonen twin, with a zone ladder, HR-reserve peel, and method-gap reading. It is not the resting-pulse count-to-BPM board, not an insurance premium stack, and not a race-pace finish ladder.

Decision framing: “For this age and resting BPM, what BPM band does each formula give for the zone I care about, and how far apart are they?”

Educational fitness literacy only. Not medical advice, exercise clearance, diagnosis, or a substitute for a clinical stress test. Seek care for chest pain, dizziness, or other warning symptoms. See our disclaimers.

Heart-rate reserve peel

Heart-rate reserve is estimated HRmax minus resting BPM. Karvonen intensity is a percent of that reserve, then resting BPM is added back. The peel shows HRmax, resting, reserve, and the mid-zone gap between Karvonen and %HRmax so the method difference is not a black box.

Load Fit / low RHR, then flip to Beginner. Watch reserve and the method gap move while age stays in the same neighborhood.

Zone ladder

Easy through near-max bands (about 50% to 100%) stay fixed as percent intensities while both formulas print BPM ranges. Tap an active zone to highlight it in the twin without losing the full ladder context.

HRmax is an estimate

This board uses the classic 220 − age estimate. Real maximum heart rate varies widely. Medications, illness, and fitness history matter. Prefer a clinician- or coach-guided measured max when stakes are high.

What the panel actually computes

Two intensity mappings from the same estimated max.

HRmax ≈ 220 − age HRR = HRmax − resting %HRmax_low = HRmax × (low%/100) %HRmax_high = HRmax × (high%/100) Karvonen_low = HRR × (low%/100) + resting Karvonen_high = HRR × (high%/100) + resting method_gap ≈ Karvonen_mid − %HRmax_mid

Where this hands off

After zone literacy, hand off for resting BPM measurement, pace, or energy estimates.

Resting count → BPM: resting pulse calculator
Race / training pace: pace calculator
Activity energy sketch: calories burned
Daily energy needs: TDEE calculator

Worked scenarios

Scenario A: Runner 30. Age 30, RHR 60, aerobic zone. Twin shows %HRmax and Karvonen bands; reserve is 130 BPM with 220 − 30.

Flip active zone to Easy, then Threshold. Ladder and twin update together so intensity jumps are visible.

Scenario B: Beginner. Higher resting BPM shrinks reserve and usually tightens the method gap versus a very fit low-RHR athlete.

Scenario C: Fit / low RHR. Large reserve; Karvonen often sits clearly above %HRmax in mid zones. That gap is the product beat.

Scenario D: Easy day. Recovery-style band for base work when a plan calls for keeping effort conversational.

Common mistakes

Treating 220 − age as a personal lab max.
Using %HRmax and Karvonen interchangeably without checking the gap.
Entering a post-coffee or standing pulse as “resting.”
Chasing near-max zones without medical clearance when risk factors exist.
Using this instead of the resting pulse tool when you only need a quiet BPM.
Ignoring symptoms because a zone “looks fine” on paper.

How to use this panel

Load a preset or enter age and resting BPM.
Pick an active zone chip (easy through near max).
Read the formula twin, HR-reserve peel, and full zone ladder.
Share when you want URL state. Typing does not rewrite the address bar. Confirm training plans with a clinician or qualified coach when needed.

When not to stop at a zone chart

Stop here for estimated BPM bands. Hand off for resting measurement, pace, or energy tools. For chest pain, fainting, or known heart disease, stop and get medical care; do not self-prescribe intensity from a web sketch.

Resting pulse: resting pulse.
Pace: pace.
Calories burned: calories burned.

Frequently asked questions

How does this target heart rate calculator work?

It estimates maximum heart rate as 220 − age, then builds training zones two ways: percent of HRmax, and the Karvonen heart-rate reserve method using your resting BPM. A zone ladder and method-gap peel show how the two formulas differ.

What is the difference between %HRmax and Karvonen?

%HRmax multiplies estimated max HR by an intensity percent. Karvonen uses heart-rate reserve (HRmax − resting HR), multiplies by the same percent, then adds resting HR back. Karvonen usually sits higher when resting HR is lower.

Is 220 minus age accurate?

It is a common classroom estimate with wide individual error. Lab or field-tested max HR is better when available. This page labels 220 − age as an estimate, not a measured max.

Which zone should I use?

Easy and moderate bands suit warm-ups and base work for many people. Harder bands are for structured intervals if your clinician and coach agree. Zones are educational labels, not prescriptions.

How do I get resting heart rate?

Measure after sitting quietly, ideally in the morning before caffeine. The resting pulse calculator can help convert a count window to BPM. Enter that average here.

Is this medical advice?

No. It is fitness literacy only. It is not a diagnosis, stress test, or clearance for exercise. People with heart disease, symptoms, pregnancy, or medications that affect heart rate need clinician guidance before using HR targets.

How is this different from the resting pulse calculator?

Resting pulse converts a quiet count into BPM and an adult band. This page turns age and resting BPM into estimated training zone ranges with two formulas side by side.

Sources

Loading…

%HRmax and Karvonen on one board

Decision framing: “For this age and resting BPM, what BPM band does each formula give for the zone I care about, and how far apart are they?”

Heart-rate reserve peel

Load Fit / low RHR, then flip to Beginner. Watch reserve and the method gap move while age stays in the same neighborhood.

Worked scenarios

Scenario A: Runner 30. Age 30, RHR 60, aerobic zone. Twin shows %HRmax and Karvonen bands; reserve is 130 BPM with 220 − 30.

Flip active zone to Easy, then Threshold. Ladder and twin update together so intensity jumps are visible.

Scenario B: Beginner. Higher resting BPM shrinks reserve and usually tightens the method gap versus a very fit low-RHR athlete.

Scenario C: Fit / low RHR. Large reserve; Karvonen often sits clearly above %HRmax in mid zones. That gap is the product beat.

Scenario D: Easy day. Recovery-style band for base work when a plan calls for keeping effort conversational.

Common mistakes

Treating 220 − age as a personal lab max.
Using %HRmax and Karvonen interchangeably without checking the gap.
Entering a post-coffee or standing pulse as “resting.”
Chasing near-max zones without medical clearance when risk factors exist.
Using this instead of the resting pulse tool when you only need a quiet BPM.
Ignoring symptoms because a zone “looks fine” on paper.

Frequently asked questions

How does this target heart rate calculator work?

What is the difference between %HRmax and Karvonen?

Is 220 minus age accurate?

It is a common classroom estimate with wide individual error. Lab or field-tested max HR is better when available. This page labels 220 − age as an estimate, not a measured max.

Which zone should I use?

Easy and moderate bands suit warm-ups and base work for many people. Harder bands are for structured intervals if your clinician and coach agree. Zones are educational labels, not prescriptions.

How do I get resting heart rate?

Measure after sitting quietly, ideally in the morning before caffeine. The resting pulse calculator can help convert a count window to BPM. Enter that average here.

Is this medical advice?

How is this different from the resting pulse calculator?

Resting pulse converts a quiet count into BPM and an adult band. This page turns age and resting BPM into estimated training zone ranges with two formulas side by side.

%HRmax and Karvonen on one board

Heart-rate reserve peel

Zone ladder

HRmax is an estimate

What the panel actually computes

Where this hands off

Worked scenarios

Common mistakes

How to use this panel

When not to stop at a zone chart

Frequently asked questions

How does this target heart rate calculator work?

What is the difference between %HRmax and Karvonen?

Is 220 minus age accurate?

Which zone should I use?

How do I get resting heart rate?

Is this medical advice?

How is this different from the resting pulse calculator?

Sources

%HRmax and Karvonen on one board

Heart-rate reserve peel

Zone ladder

HRmax is an estimate

What the panel actually computes

Where this hands off

Worked scenarios

Common mistakes

How to use this panel

When not to stop at a zone chart

Frequently asked questions

How does this target heart rate calculator work?

What is the difference between %HRmax and Karvonen?

Is 220 minus age accurate?

Which zone should I use?

How do I get resting heart rate?

Is this medical advice?

How is this different from the resting pulse calculator?

Sources

What this number means

Share your calculation