2026-09-16 9 min

Training Heart Rate Calculator

Training target heart rate via the Karvonen formula from age, resting pulse and intensity.

Calculator

Age years

Resting HR bpm

Intensity %

Results update live as you type

Status:148 bpm target70% intensityScore 82/100

Training Heart Rate Calculator Results

Score82

Training target148 bpm target

Intensity70% intensity

Max HR184 bpm max

Reserve119 bpm reserve

KindTraining target

Training target 148 bpm at 70% of reserve (max 184, resting 65).

Training target Breakdown

Measure	Value	Context
Training target	148 bpm	70% of reserve
Max	184 bpm	208 - 0.7 x age
Reserve	119 bpm	max - resting
Intensity	70 %	of reserve
Zone 2 ref	136-148 bpm	60-70% band
Max ref	184 bpm	ceiling

Recommendations

▸Warm up 10 minutes before holding 148 bpm.
▸Let the first 5 minutes settle — cardiac lag overshoots early.
▸Slow ~5 beats on hot or high-caffeine days.
▸Talk-test monthly: target effort matches if short sentences still work.
▸Training target 148 bpm at 70% of reserve (max 184, resting 65).

Results

Optimal

Target Score

82/100

Computation rating

Training target

148 bpm target

Beats per minute

Intensity

70% intensity

Of reserve

Max HR

184 bpm max

Estimate

Reserve

119 bpm reserve

Usable beats

Kind

Training target

Target type

Zone math is exact Karvonen arithmetic; max-HR formulas estimate within ~10 beats — field-test for precision.

Visualizations

Target gauges (bpm)

148 bpmTarget

183.5 bpmMax

118.5 bpmReserve

Target vs 220 scale

Target67%

Headroom33%

Zone Score

Score82/100

Formula

The Karvonen equation personalizes intensity with your resting pulse.

Target = (max - resting) x intensity + resting

Alternative Form

Max = 208 - 0.7 x age

Variables

Symbol	Name	Unit	Description
M	Max	bpm	Tanaka estimate
R	Resting	bpm	Morning pulse
I	Intensity	%	Share of reserve
HRR	Reserve	bpm	M - R
T	Target	bpm	HRR x I + R

Explanation

Seventy percent of a 119-beat reserve plus 65 resting equals a 148 bpm target.

Derivation

Karvonen, Kentala & Mustala (1957).

Step-by-Step Calculation

Follow each step to understand how the result is calculated from your inputs.

Step 1

Estimate max from age.

Max = 208 - 0.7 x age

Age:35

Intermediate: 208 - 24.5

Result: 184 bpm max

Step 2

Subtract resting pulse.

Reserve = 184 - 65

Resting:65 bpm

Intermediate: 184 - 65

Result: 119 bpm reserve

Step 3

Take the intensity share.

Share = reserve x %

Intensity:70%

Intermediate: 119 x share

Result: 83 bpm share

Step 4

Add resting back.

Target = share + resting

Share:83

Resting:65

Intermediate: 83 + 65

Result: 148 bpm target

Step 5

Sanity-check the zone.

70% sits atop Zone 2

Target:148 bpm

Intermediate: zone lookup

Result: Zone 2/3 boundary

Step 6

Confirm the target.

Complete targets score 82

Target:148 bpm

Intermediate: completeness

Result: Target score = 82/100

Final Answer

82/100

Worked Examples

See how the calculator works with different scenarios.

Scenario

Age 35, resting 65, 70%.

Inputs

Age:35

Resting:65

Calculation

Reserve 119; 119 x 0.7 + 65 = 148

Result

148 bpm target

Interpretation

Top of Zone 2 — the classic base pace.

Understanding Your Result

Your Result: Target Score: 82/100

Typical range: Zone 1 50-60%, Zone 2 60-70%, Zone 3 70-80%, Zone 4 80-90%, Zone 5 90-100% of heart-rate reserve.

What This Means

The output converts age (and resting pulse) into max HR, reserve and five Karvonen zones with a 0-100 zone score.

Why It Matters

Zones turn vague effort into exact beats per minute, so easy days stay easy and hard days land where adaptation lives.

Professional Interpretation

Coaches prescribe ~80% of cardio in Zones 1-2 and ~20% in Zones 4-5, retesting max yearly as it drifts down.

Karvonen beats percent-of-max

Including resting HR personalizes zones: two 35-year-olds with resting 50 vs 80 get different Zone 2 windows.

Formulas estimate, tests confirm

A ramp test or verified peak beats any equation by ~10 beats for zone boundaries.

Recommendations

•Spend 80% of cardio in Zones 1-2
•Cap Zone 5 at one session weekly
•Slow hot-day targets 5-10 beats
•Retest max yearly

Educational Content

Introduction

This calculator turns age and pulse into a complete heart-rate zone map.

Concept Explanation

Reserve-based zones scale intensity to your personal beat range instead of population averages.

Applications

▸Zone-based training

▸Fat-loss cardio

▸Base building

▸Interval prescription

▸Fitness testing

▸Recovery monitoring

Benefits

•Exact Karvonen zones
•Five-zone table
•Beat-level targets
•Hot-day adjustments
•0-100 zone score

Limitations

•Max is estimated
•Medications shift HR
•Monitors lag intervals
•Heat and caffeine skew
•Single-day snapshot

Best Practices

•Measure resting three mornings
•Use a chest strap for intervals
•Re Nau test max yearly
•Judge zones by breathing too
•Log zones per session

Common Misconceptions

Myth: 220 minus age is exact.

Truth: It misses by ~10 beats routinely. Tanaka is better, and a tested peak beats both.

Myth: Fat-burning zone melts most fat.

Truth: It burns the highest fat share of the fewest calories. Total deficit rules fat loss.

Myth: Higher zone always means fitter.

Truth: Base fitness comes from easy Zone 2 hours; Zone 5 without base just exhausts.

Practical Tips

•Take resting pulse before coffee
•Average three mornings, not one
•Breathe through nose as a Zone 2 check
•Slow 5-10 bpm on hot days
•Tighten straps for intervals
•Talk-test every zone monthly

Common Mistakes

Using 220-age blindly

Switch to Tanaka and, better, a tested peak; 10-beat errors misplace every zone.

Living in Zone 3

Moderate-grey training fatigues without building base or top end. Polarize: easy or hard.

Chasing wrist numbers on intervals

Optical lag invents zone compliance. Feel plus strap beats wrist on repeats.

Ignoring drift

Holding early pace as HR climbs cooks hot sessions. Cap by HR, not pace, when hot.

Zone 5 without base

Sprinting on a 20-minute base invites injury. Build 8-12 Zone 2 weeks first.

Never retesting

Max falls ~1 beat yearly; stale zones creep upward in real effort.

Assumptions

This calculator makes the following assumptions to provide estimates:

Healthy adult: Math assumes no cardiac conditions or rate-altering medication.

Seated resting baseline: Resting HR is a calm morning reading, not post-coffee.

Tanaka max estimate: Max comes from 208 - 0.7 x age unless you enter a tested value.

Steady-state context: Zones describe sustained efforts; sprint spikes overshoot briefly.

Sea-level temperate: Heat, altitude and dehydration all shift real zones upward.

Limitations

Be aware of these limitations when using this calculator:

Max estimated: ~10-beat error band around every formula boundary.

Device error: Wrist optics err 5+ beats; intervals need chest straps.

Daily variance: Sleep, stress and caffeine swing zones 3-7 beats day to day.

Medication blind: Beta blockers and stimulants invalidate standard zones.

No fitness input: Two identical ages can have very different thresholds.

Frequently Asked Questions

Answers to common questions about this calculator.

What is maximum heart rate?

The fastest your heart can beat, estimated as 208 - 0.7 x age (Tanaka). True max varies about 10 beats around any formula.

How accurate is 220 minus age?

Within roughly 10-12 beats for most people, but it overestimates the young and underestimates older athletes. Tanaka (208 - 0.7 x age) fits research data better.

How do I measure resting heart rate?

Sit quietly five minutes, ideally just after waking, and count beats for 60 seconds — or wear a tracker overnight and take the lowest reading.

What is a good resting heart rate?

60-100 is medically normal; trained adults often sit 40-60. A rising trend over weeks matters more than any single number.

What is heart-rate reserve (HRR)?

Max minus resting heart rate — your usable beats. Karvonen zones built on HRR personalize far better than raw percentages of max.

Karvonen vs percent-of-max: which zones?

Karvonen (HRR-based) for trained people with known resting HR; simple percent-of-max works for beginners without a baseline.

Why is Zone 2 so popular?

Zone 2 (60-70%) builds mitochondrial base with minimal fatigue, so athletes stack hours of it. Most adults should spend 80% of cardio here.

Does the fat-burning zone burn more fat?

A higher percentage of fat, but fewer total calories. Total deficit decides fat loss — higher zones burn more of everything per minute.

How do I train Zone 5 safely?

After a Zone 2 base and medical clearance if at risk: 2-4 minute intervals with equal rest, once weekly maximum.

Why does my heart rate drift upward?

Cardiac drift: dehydration and heat raise HR 5-15 beats at constant pace. Drink on schedule and slow hot-day targets accordingly.

Does caffeine change my zones?

Caffeine adds roughly 3-7 beats at the same effort. Rate efforts by breathing and feel on high-caffeine days.

Are wrist monitors accurate enough?

Within ~5 beats for steady efforts; they lag badly on intervals. Use a chest strap when zones must be exact.

How often should I retest?

Max yearly (it falls ~1 beat/year), resting monthly from morning averages, zones whenever fitness shifts a gear.

Do medications affect heart rate?

Beta blockers, some antidepressants and decongestants all shift HR. Zone math assumes unmedicated physiology — ask your doctor.

Related Calculators

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Related Guides

Deepen your understanding with these educational resources.

Getting Started with Strength Training

Progressive overload, volume landmarks and recovery basics.

Cardio Training Essentials

Zones, VO2 max and weekly aerobic volume that actually moves fitness.

Nutrition for Active People

Protein, calories and hydration to support training and recovery.

Understanding Recovery

Sleep, rest days and deloads that turn training into adaptation.

Glossary

Technical terms used in mortgage calculations explained in plain language.

Maximum heart rate: Fastest achievable pulse; estimated 208 - 0.7 x age.
Resting heart rate: Morning seated pulse; fitness and fatigue barometer.
Heart-rate reserve: Max minus resting: the usable beat range for Karvonen zones.
Karvonen formula: Target = (max - resting) x intensity + resting.
Training zones: Five intensity bands from recovery (Z1) to maximal (Z5).
Zone 2: 60-70% of reserve; the aerobic-base builder.
Lactate threshold: Top of Zone 4; the fastest sustainable ~hour effort.
Aerobic base: Low-intensity capacity built mostly in Zones 1-2.
Fat-burning zone: Upper Zone 1 to Zone 2; high fat share, modest total burn.
Cardiac drift: Upward HR creep from heat and dehydration at fixed pace.
1-min HRR: Beats recovered one minute post-exercise; 12+ is normal.
Tanaka equation: Max HR = 208 - 0.7 x age; best general estimate.

Authoritative References

Trusted sources and standards referenced by this calculator.

American Heart Association — Fitness resources ACSM — Exercise guidance and resources CDC — Physical activity guidelines NIH — Exercise and health information WHO — Physical activity fact sheets AtlasCalcs — Health resources

Applicable Standards

ACSM Guidelines for Exercise Testing and PrescriptionAHA target heart-rate recommendationsTanaka et al. age-predicted max HR equation (2001)

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Page Information

Last Updated:

2026-09-16

Version:

2.0.0

References:

License:

Free to use for educational and professional purposes.