Health & Fitness

Max HR / Target Heart Rate Zones Calculator

Health & Fitness

Max HR / Target Heart Rate Zones Calculator

Live answer137-161 bpmEstimated max HR 185 bpm; heart-rate reserve 120 bpm; Karvonen zone 60-80%.

Age (years)Resting heart rate (bpm)Zone low (%)Zone high (%)

Live result137-161 bpmEstimated max HR 185 bpm; heart-rate reserve 120 bpm; Karvonen zone 60-80%.

Formula used

Estimated max HR = 220 − age. Heart-rate reserve = max HR − resting HR. Target low = reserve × low % + resting HR. Target high = reserve × high % + resting HR.

This is the method behind the answer, so the result can be checked rather than simply trusted.

Live math canvas

Your numbers, formula and explanation together

Max HR / Target Heart Rate Zones Calculator: 137-161 bpm. Estimated max HR 185 bpm; heart-rate reserve 120 bpm; Karvonen zone 60-80%.

Formula applied

The exact method behind this answer

CalculationTime keeps the method visible so the number can be checked instead of blindly trusted.

Estimated max HR = 220 − age. Heart-rate reserve = max HR − resting HR. Target low = reserve × low % + resting HR. Target high = reserve × high % + resting HR.

Apply the formulaEstimated max HR = 220 − age. Heart-rate reserve = max HR − resting HR. Target low = reserve × low % + resting HR. Target high = reserve × high % + resting HR.137-161 bpmEstimated max HR 185 bpm; heart-rate reserve 120 bpm; Karvonen zone 60-80%.

Your live breakdown

Current inputs in the calculation

These values come from the controls above and update when the calculator changes.

Age: 35 years
Resting heart rate: 65 bpm
Zone low: 60 %
Zone high: 80 %

Resulting answer

137-161 bpm

Estimated max HR 185 bpm; heart-rate reserve 120 bpm; Karvonen zone 60-80%.

Answer: 137-161 bpm
Live support: Estimated max HR 185 bpm; heart-rate reserve 120 bpm; Karvonen zone 60-80%.

Assumptions used

What this answer assumes

The visible assumptions define the boundary of this calculation.

Maximum heart rate formulas are approximate.
Medical conditions, medication and fitness level can change safe training intensity.
Stop exercise and seek help for chest pain, fainting or severe symptoms.

Master’s Tip

How to use the result well

Master’s Tip: heart-rate reserve usually gives a more personal zone than simply taking a percent of max heart rate.

Printable record

What belongs in the saved calculation

Save the inputs, result, formula, assumptions, page URL and date together so the calculation can be reviewed later.

Age: 35 years
Resting heart rate: 65 bpm
Zone low: 60 %
Zone high: 80 %

Visual grid

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Max HR / Target Heart Rate Zones is not just a final answer. It is a step on a line: before and after, input and output, assumption and result.

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InputFormulaResult

137-161 bpm

CalculationTime keeps the path visible: the input, the method and the final number belong together.

137-161 bpmEstimated max HR 185 bpm; heart-rate reserve 120 bpm; Karvonen zone 60-80%.

Inputs

Age: 35 years
Resting heart rate: 65 bpm
Zone low: 60 %
Zone high: 80 %

Method

Estimated max HR = 220 − age. Heart-rate reserve = max HR − resting HR. Target low = reserve × low % + resting HR. Target high = reserve × high % + resting HR.

At age 35, estimated max HR is 185 bpm. With resting HR 65, a 60-80% reserve zone is about 137-161 bpm.

Assumptions

Maximum heart rate formulas are approximate.
Medical conditions, medication and fitness level can change safe training intensity.
Stop exercise and seek help for chest pain, fainting or severe symptoms.

Notes

Use this space on the printed report for client, supplier, classroom, job-location, measurement, quote or approval notes.