Cardio
Assess your cardiovascular fitness from your resting heart rate. Enter your RHR to get a fitness classification, estimated cardiovascular age, and targets for improvement.
Average cardiovascular fitness. Consistent cardio 3–4×/week can shift this up a tier.
Your heart age matches your calendar age.
Where your RHR sits across the 6 cardiovascular fitness tiers.
❤️ Disclaimer: RHR norms are general population averages. Individual results vary based on medications, fitness level, stress, and health conditions. This is not medical advice — consult a healthcare professional for personalized guidance.
Contract, discovery endpoints, and developer notes for agent use.
Always available for agents
Tool contract JSON
https://aifithub.io/contracts/resting-heart-rate-calculator.jsonStable input and output contract for this exact tool.
Human review
People can use the browser page to sense-check outputs and charts, but agents should still execute against the contract and discovery endpoints.
{
"tool": "resting_heart_rate",
"rhr": 62,
"age": 35,
"gender": "male"
} No. Start with /agent-tools.json, then follow the tool's contract URL. The page UI is for human review, not parameter discovery.
Every tool opens in Quick Start first. Advanced Controls keeps the same scenario, reveals more assumptions or diagnostics, and every tool keeps AI integrations inline below the instructions.
Open it when a human wants to sense-check the output, review the chart, or keep exploring related tools after the calculation finishes.
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.
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.
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.
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.
Yes. AI Fit Hub tools are free, no-signup browser tools. Inputs stay in your browser unless you choose to share a URL.
No. These outputs are general fitness estimates — not medical advice. Consult a healthcare professional for heart health guidance.
Related Resources
Every link here is tied directly to Resting Heart Rate Calculator. Use the explanation, formula, examples, and benchmarks to pressure-test the calculator output from first principles.
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