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🫀Heart Rate Zone Calculator

What is Heart Rate Zones?

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Heart rate training zones define intensity levels for cardio exercise. The Karvonen formula uses heart rate reserve (HRmax − resting HR) to give personalised zones more accurate than simple %HRmax methods.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

How to Heart Rate Zones

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  1. 1HRmax estimate = 220 − age (or use lab test)
  2. 2Heart rate reserve (HRR) = HRmax − Resting HR
  3. 3Zone HR = Resting HR + (HRR × % intensity)
  4. 45 zones: 50–60% / 60–70% / 70–80% / 80–90% / 90–100% HRR

Worked Examples

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Example 1
Given:Age 35 · Resting HR 60 · HRmax 185
Výsledok:Zone 2 (aerobic base): 111–125 bpm

60+(185−60)×0.6 to 0.7

Training zones and benefits

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ZoneIntensityPrimary benefit
Z1 Recovery50–60%Active recovery
Z2 Aerobic base60–70%Fat burning, endurance
Z3 Aerobic70–80%Cardiovascular fitness
Z4 Threshold80–90%Lactate threshold, speed
Z5 VO2max90–100%Maximum aerobic power
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Did you know?

Zone 2 training (comfortable aerobic pace) is where elite endurance athletes spend 70–80% of their training time — building the aerobic base that supports faster work.

Len na informačné účely. Tento nástroj nenahrádza odborné lekárske poradenstvo, diagnózu ani liečbu. Vždy sa poraďte s kvalifikovaným zdravotníckym odborníkom.
Deep Dive

Read the full guide on how to use this calculator effectively

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Reviewed October 2026
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