Target Heart Rate Calculator

Last updated: April 2026

Age

yrs

Method

Target heart rate summary

190 bpm

Estimated maximum heart rate

MethodBasic

General fitness target

Zone 2-3: 114-152 bpm

Heart rate zones

Zone	Intensity	Target BPM	Use
Very light	50-60%	95-114 bpm	Warm-up / recovery
Light / fat burn	60-70%	114-133 bpm	Easy cardio / base fitness
Moderate / aerobic	70-80%	133-152 bpm	Endurance training
Hard / threshold	80-90%	152-171 bpm	Performance training
Maximum	90-100%	171-190 bpm	Short intense efforts

Medical limitation note

Heart rate zones are estimates for exercise planning. Medication, stress, caffeine, sleep, temperature, and fitness level can all change heart rate response.

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What is target heart rate?

Target heart rate is a training range based on exercise intensity. It helps estimate how hard you are working during cardio exercise.

How is maximum heart rate calculated?

Estimated maximum heart rate is calculated as maximum heart rate = 220 - age.

What are heart rate zones?

Heart rate zones split exercise intensity into five ranges, from easy recovery work to short maximum efforts.

Basic method vs Karvonen method

The basic method uses a percentage of maximum heart rate. Karvonen uses heart rate reserve and resting heart rate, so it is usually more personalised.

Which heart rate zone should I use?

Zone 1 is for warm-up and recovery, Zone 2 for easy cardio, Zone 3 for aerobic endurance, Zone 4 for hard threshold training, and Zone 5 for short maximum effort.

Limitations

Heart rate estimates are approximate and can be affected by medication, stress, caffeine, sleep, temperature, and fitness level.

About this calculator

The Target Heart Rate Calculator estimates exercise heart-rate zones using either a basic maximum-heart-rate percentage method or the Karvonen heart-rate-reserve method. It helps structure training intensity, but heart-rate targets are not a substitute for clinical advice. Use this expanded guide when you need more than a quick result. It explains the assumptions behind the Target Heart Rate Calculator, the records to gather, and the decisions the estimate can support. It is especially useful for people estimating exercise heart-rate zones for walking, running, cycling, cardio classes, or general fitness training. The strongest use of the page is scenario comparison: change one input at a time, compare the output, and keep a note of which assumption changed.

Target heart rate zone method

The calculator estimates maximum heart rate as 220 minus age. Basic mode multiplies that value by each zone percentage. Karvonen mode subtracts resting heart rate to get heart-rate reserve, multiplies reserve by intensity, then adds resting heart rate back. The calculator result depends on the quality of the inputs and on the rule set or formula selected in the calculator above. For practical use, treat the output as a structured estimate: start with the core inputs, review the main outputs, then test the decision points that matter most to your situation. Key decisions include whether to use basic or Karvonen method, which zone matches the session goal, when heart-rate data should be treated cautiously.

maximum heart rate = 220 - age
basic zone bpm = maximum heart rate x intensity
Karvonen zone bpm = resting heart rate + (maximum heart rate - resting heart rate) x intensity
better estimate = accurate inputs + correct rule set + realistic assumptions
scenario difference = revised result - original result

How to use the target heart rate calculator

Enter age.
Choose basic or Karvonen method.
Enter resting heart rate if using Karvonen.
Review the zone ranges from very light to maximum.
Use perceived effort and symptoms alongside heart rate.
Gather the main inputs first: age, resting heart rate, method.
Check supporting records such as resting heart rate measurement and wearable data before relying on a final number.
Enter one realistic scenario first, using conservative assumptions where the future is uncertain.
Review the main outputs: maximum heart rate, heart-rate reserve, zone minimum bpm.
Run at least one alternative scenario so you can see which input changes the answer most.
Compare the result with NHS physical activity guidance and clinical advice where health risks apply or the relevant contract, bill, statement, or professional document.
Keep the calculation date and assumptions with your notes so you can revisit the estimate when rates, rules, or circumstances change.

Worked example

Basic zone estimate

Input: Age 30 and basic method

Calculation: Maximum heart rate = 220 - 30 = 190; moderate zone uses 70% to 80%.

Result: Moderate zone is about 133 to 152 bpm.

Karvonen scenario

Input: Age 30, resting heart rate 60, moderate zone 70% to 80%.

Calculation: Reserve is 130; zone = 60 + reserve x intensity.

Result: The moderate zone is about 151 to 164 bpm.

Invalid resting heart rate scenario

Input: Age 70 and resting heart rate 160.

Calculation: Estimated maximum is 150, so resting heart rate is not lower than max.

Result: The calculator rejects the Karvonen input.

Basic versus Karvonen

The basic method is simple and only needs age. Karvonen includes resting heart rate, so it can better reflect individual baseline fitness, but it still depends on an estimated maximum heart rate.

What to check before relying on the result

A useful Target Heart Rate Calculator result starts with the same evidence you would use if you were checking the answer manually. The calculator can organise the arithmetic, but it cannot know whether a payslip is final, a bill is estimated, a quote excludes fees, or a personal circumstance has changed since the last statement.

Before making a decision, compare the calculator result with the source document that controls the real outcome. For this topic, that usually means checking NHS physical activity guidance and clinical advice where health risks apply. If there is a difference between the calculator and an official statement, contract, assessment, or professional advice, treat the official document as the stronger source.

resting heart rate measurement: Use this as supporting evidence for the calculation. If it is out of date, estimated, or based on a different period, the calculator output may look precise while still being wrong for the decision.
wearable data: Use this as supporting evidence for the calculation. If it is out of date, estimated, or based on a different period, the calculator output may look precise while still being wrong for the decision.
training log: Use this as supporting evidence for the calculation. If it is out of date, estimated, or based on a different period, the calculator output may look precise while still being wrong for the decision.
symptom notes: Use this as supporting evidence for the calculation. If it is out of date, estimated, or based on a different period, the calculator output may look precise while still being wrong for the decision.

Inputs that usually change the answer

The most important input is not always the largest number on the form. Sometimes a date, threshold, percentage, eligibility flag, or timing assumption changes the result more than the headline amount. This is why scenario testing is more useful than a single calculation.

Input	Why it matters	What to double-check
age	It feeds directly into the estimate or changes which rule is applied.	Check the period, units, eligibility, and whether the figure is final or estimated.
resting heart rate	It feeds directly into the estimate or changes which rule is applied.	Check the period, units, eligibility, and whether the figure is final or estimated.
method	It feeds directly into the estimate or changes which rule is applied.	Check the period, units, eligibility, and whether the figure is final or estimated.
zone intensity	It feeds directly into the estimate or changes which rule is applied.	Check the period, units, eligibility, and whether the figure is final or estimated.
training goal	It feeds directly into the estimate or changes which rule is applied.	Check the period, units, eligibility, and whether the figure is final or estimated.

How to interpret the output

The output should be read as a decision aid, not just a number. For Target Heart Rate Calculator, the useful question is often what the result means for timing, affordability, eligibility, comparison, or next steps.

maximum heart rate: Use this output alongside the other results rather than in isolation. A monthly amount, percentage, date, or payback figure can look acceptable until fees, timing, evidence, or eligibility conditions are added.
heart-rate reserve: Use this output alongside the other results rather than in isolation. A monthly amount, percentage, date, or payback figure can look acceptable until fees, timing, evidence, or eligibility conditions are added.
zone minimum bpm: Use this output alongside the other results rather than in isolation. A monthly amount, percentage, date, or payback figure can look acceptable until fees, timing, evidence, or eligibility conditions are added.
zone maximum bpm: Use this output alongside the other results rather than in isolation. A monthly amount, percentage, date, or payback figure can look acceptable until fees, timing, evidence, or eligibility conditions are added.

Scenarios worth comparing

A single estimate is a snapshot. A better approach is to save a base case, then adjust one assumption at a time. This shows whether the result is stable or whether a small change in timing, rate, usage, income, or cost creates a very different answer.

Scenario	Change one assumption	What the comparison shows
Base case	Use the best current evidence.	Shows the result you would expect if nothing important changes.
Conservative case	Use lower income, higher cost, slower growth, or less favourable timing.	Shows whether the decision still works with less optimistic assumptions.
Improved case	Use the realistic upside, such as lower cost, better rate, higher usage, or stronger evidence.	Shows the potential benefit without treating it as guaranteed.

Common mistakes and edge cases

Most errors come from using the right formula with the wrong assumption. Dates can be counted differently, rates can change, official thresholds can move, and real bills or contracts often include conditions that a simple calculator cannot infer automatically.

Maximum heart rate is estimated.: Check this point before using the estimate for a payment, claim, purchase, application, employment decision, or health-related decision.
Medications can alter heart response.: Check this point before using the estimate for a payment, claim, purchase, application, employment decision, or health-related decision.
Resting heart rate should be measured consistently.: Check this point before using the estimate for a payment, claim, purchase, application, employment decision, or health-related decision.
Symptoms matter more than staying in a zone.: Check this point before using the estimate for a payment, claim, purchase, application, employment decision, or health-related decision.

Next steps after calculating

Once you have a result, write down the key assumptions and compare them with NHS physical activity guidance and clinical advice where health risks apply. If the number affects a deadline, tax return, benefit claim, employment issue, medical question, finance agreement, or major purchase, use the calculator as preparation for a more formal check.

For lower-stakes use, the next step may simply be comparing two or three scenarios. For higher-stakes use, the next step should be checking the official guidance, speaking to the relevant organisation, or getting qualified advice before acting.

Heart-rate zone edge cases

Resting heart rate must be lower than estimated maximum heart rate for Karvonen mode.
Some medications and health conditions alter heart-rate response.
The 220 minus age estimate can be inaccurate for individuals.
Maximum heart rate is estimated.
Medications can alter heart response.
Resting heart rate should be measured consistently.
Symptoms matter more than staying in a zone.

Limitations

This calculator is general fitness information only and is not medical advice. This is general fitness information only and is not medical advice. The calculator is designed to support understanding and planning, but it cannot verify documents, predict future rule changes, or account for every exception. Use it as an estimate and check the official source before acting where the result matters.

Seek clinical advice before exercise if you have heart symptoms or relevant medical conditions.
Use perceived exertion and safety signals, not heart rate alone.
A lab-measured maximum heart rate is more specific than an age estimate.
Check NHS physical activity guidance and clinical advice where health risks apply for current rules, rates, definitions, and eligibility where relevant.
Do not rely on a single scenario where income, costs, dates, rates, usage, or health circumstances may change.
Keep records of the inputs used so that the estimate can be reviewed later.

Frequently asked questions

Which method should I use?

Basic is simpler; Karvonen is often more individual if you know a reliable resting heart rate.

Why are my watch zones different?

Wearables may use different formulas, thresholds, or measured data.

Should I train in the maximum zone?

High-intensity work should be used carefully and may be unsuitable for some people.

Is 220 minus age accurate?

It is a common estimate, but individuals can be meaningfully above or below it.

What is heart-rate reserve?

It is estimated maximum heart rate minus resting heart rate.

Should I stop if I feel unwell?

Yes. Symptoms such as chest pain, dizziness, or unusual breathlessness should be taken seriously.

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What does this mean?

This calculator is designed to help you understand the likely number before you make a decision or start an application.

Your result should be checked against official UK guidance, especially if your circumstances include dependants, exemptions, prior leave, or a complex immigration history.

Treat the figure as a planning tool rather than legal advice. Where the answer affects an application deadline or major payment, speak to an authorised adviser.

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