What is a resting heart rate?

Your resting heart rate (RHR) is the number of times your heart beats per minute when you're at rest. It's best measured in the morning before getting out of bed.

What is a normal resting heart rate?

For most adults, a normal RHR is 60–100 bpm. Athletes often have RHRs of 40–60 bpm due to more efficient cardiac output from regular training.

Why does a lower RHR indicate better fitness?

A well-trained heart pumps more blood per beat, so it needs fewer beats per minute to circulate blood. Lower RHR generally reflects stronger cardiovascular efficiency.

How is cardiovascular age estimated?

Cardio age adds or subtracts years from your actual age based on your fitness classification. An Athlete classification subtracts 6 years; a Poor classification adds 5 years.

Is this tool free and private to use?

Yes. AI Fit Hub tools are free, no-signup browser tools. Inputs stay in your browser unless you choose to share a URL.

Do these tools replace medical guidance?

No. These outputs are general fitness estimates — not medical advice. Consult a healthcare professional for heart health guidance.

Methodology: Resting Heart Rate Calculator

Scope

Classifies resting heart rate, estimates relative cardio-fitness age, and suggests a training target to improve RHR.

Formula

Classification lookup by sex and age band. Cardio-age estimate maps RHR to the age where that RHR is the median.

Coefficients

Parameter	Value	Note
Athlete (M, 30s)	`49–55 bpm`
Excellent (M, 30s)	`56–61 bpm`
Average (M, 30s)	`66–69 bpm`
Poor (M, 30s)	`82+ bpm`

Data sources

Cooper Institute fitness norms — Resting Heart Rate. — Source of the age- and sex-banded RHR percentile tables.
Nauman J, Janszky I, Vatten LJ, Wisloff U. Temporal changes in resting heart rate and deaths from ischemic heart disease. JAMA. 2011;306(23):2579-2587. — PMID 22187277. Population-level link between RHR change and ischemic heart disease mortality.

Assumptions

Reading is taken upon waking, before caffeine or activity.

Approximation range

Population norms carry ~4–6 bpm standard deviation within each age band.

Limitations

Beta-blockers and other meds shift RHR independently of fitness.
Atrial fibrillation and other arrhythmias invalidate any RHR classification.

Reproducibility

Male, 35, RHR 58: classification 'Excellent'.

Change log

2026-04-24: methodology page first published.

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Worked example

Computed by the same engine bundle served at /engines/resting-heart-rate-calculator.js. Re-runnable: the values below are the literal output of compute(engineInput).

Input

tool: resting_heart_rate
rhr: 62
age: 35
sex: male

Output

classification: Average
cardioAge: 35
targetRHR: 59
rhrReduction: 3
cardioAgeLabel: Your heart age matches your calendar age
fitnessMessage: Average cardiovascular fitness. Consistent cardio 3–4×/week can shift this up a tier.

FAQ

What is a resting heart rate?: Your resting heart rate (RHR) is the number of times your heart beats per minute when you're at rest. It's best measured in the morning before getting out of bed.
What is a normal resting heart rate?: For most adults, a normal RHR is 60–100 bpm. Athletes often have RHRs of 40–60 bpm due to more efficient cardiac output from regular training.
Why does a lower RHR indicate better fitness?: A well-trained heart pumps more blood per beat, so it needs fewer beats per minute to circulate blood. Lower RHR generally reflects stronger cardiovascular efficiency.
How is cardiovascular age estimated?: Cardio age adds or subtracts years from your actual age based on your fitness classification. An Athlete classification subtracts 6 years; a Poor classification adds 5 years.
Is this tool free and private to use?: Yes. AI Fit Hub tools are free, no-signup browser tools. Inputs stay in your browser unless you choose to share a URL.
Do these tools replace medical guidance?: No. These outputs are general fitness estimates — not medical advice. Consult a healthcare professional for heart health guidance.