Cardio
Resting Heart Rate Calculator
How your resting heart rate compares with others your age and sex, and the reading that would rate Good.
Result
Between the 25th percentile and the median for your age and sex. It is inside the 60–100 bpm normal adult range.
Where you sit in the reference data
Resting heart rate tiers for men aged 20-39; lower is fitter.
U.S. reference data for men aged 20-39
| Athlete | 52 or less | |
| Excellent | 53–55 bpm | |
| Good | 56–61 bpm | |
| Above Average | 62–69 bpm | You |
| Average | 70–76 bpm | |
| Below Average | 77–84 bpm | |
| Poor | 85+ bpm |
Questions people usually ask
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?
It isn't: resting heart rate alone can't estimate a heart or cardiovascular age. The calculator compares your reading with U.S. resting-pulse percentiles for your age and sex (NHANES 1999-2008; seven tiers, Athlete to Poor), shows the reading that would rate Good, and checks it against the 60–100 bpm normal adult range.
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.
The formula, worked through
- Formula Resting Heart Rate Formula and Percentile Chart
Resting heart rate rating: your seated pulse against U.S. NHANES percentiles for age and sex, from Athlete (lowest 5%) to Poor (above the 90th percentile).
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Background on the Resting Heart Rate Calculator
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Articles
- 11 min read Heart-Rate Zones: Methods Compared
Heart-rate zone methods compared: Karvonen, %HRmax, %HRR, lactate threshold — accuracy by training age, error bands, and which one for which goal.
- 7 min read HRV Deload Trigger: A 7-Day Decline from Baseline 56 to Mean 50
HRV trend 55, 57, 52, 48, 46, 47, 45 against baseline 56 (SD 4.2). Rolling deviation -10.7%, five days below SWC, deload recommendation: yes. The math.
- 8 min read Sleep Debt, HRV, and Sleep Calculator: Cross-Checking Recovery Signals
Same week, three engines: sleep debt, HRV trend, sleep-calculator wake time. Where the signals agree, where they conflict, and which one to trust.
By goal
Use it from an agent or code
Any agent can run this calculator by URL: put the inputs in the query string and get JSON back, with the inputs that used defaults and a line to cite (add format=md for markdown). MCP clients reach it through https://aifithub.io/mcp.
https://aifithub.io/api/run/resting-heart-rate-calculator?rhr=62&age=35&sex=male
In code, import the same module; it runs where you import it, with no request or key.
import { compute } from "https://aifithub.io/engines/resting-heart-rate-calculator.js";Input and output contract, TypeScript types and the guide for agents.