Health Tools

Heart Rate Reserve Calculator

Estimate heart rate reserve from resting heart rate and a direct or age-estimated max heart rate.

Updated April 14, 2026
Free online tool
Planning and research use

Why this page exists

Training numbers get easier to understand when resting heart rate and max heart rate are turned into one reserve value instead of being left as separate measurements. This calculator helps visitors estimate heart rate reserve from maximum heart rate and resting heart rate, with an optional age-based max-heart-rate mode.

Interactive tool

Run the estimate

Enter your numbers and read the result first, then use the sections below to understand what affects the outcome.

Calculator

Heart rate reserve calculator

Estimate heart rate reserve from resting heart rate and either a direct max heart rate or a simple age-based max estimate.

Result

126 bpm

Estimated heart rate reserve based on maximum heart rate minus resting heart rate.

Heart rate reserve126 bpm

Resting heart rate used58 bpm

Max heart rate used184 bpm

Example 60% reserve target134 bpm

184 bpm of max heart rate minus 58 bpm of resting heart rate gives a heart rate reserve near 126 bpm.
A simple 60% heart-rate-reserve training target would land near 134 bpm in this estimate.
Use the result as a broad training reference only, because measured max heart rate and individualized zone testing can differ from simple estimates.

This is a general fitness estimate, not medical advice. Real max heart rate and training targets can vary with testing method, medication, fitness level, and health conditions.

Planning note

Last updated April 14, 2026. Use this tool to compare scenarios and plan ahead, then confirm important details with the lender, employer, insurer, contractor, or other qualified provider involved in the final decision.

How it works

What the calculator is doing

Choose whether you want to enter a known max heart rate or estimate one from age.

Enter resting heart rate and the other value needed for the chosen mode.

The calculator subtracts resting heart rate from max heart rate to estimate heart rate reserve.

Understanding your result

This is a general fitness estimate, not medical advice. Real max heart rate and training targets can vary with testing method, medication, health conditions, and individual physiology.

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Examples

Ways people use this tool

Example scenarios help turn a quick estimate into a more useful comparison or planning step.

Estimate reserve from a known tested max heart rate

If you already know your max heart rate, the calculator turns it into a cleaner reserve number for training reference.

Use age when max heart rate is not known

The age-based mode gives a quick screening estimate when you want a rough reserve figure without formal testing.

Use it with zone and recovery tools

Heart rate reserve often fits naturally beside heart-rate-zone, recovery, and VO2-max estimates.

FAQ

Common questions

How is heart rate reserve calculated here?

The calculator subtracts resting heart rate from max heart rate. In the age-based mode, it uses a simple 220 minus age estimate for max heart rate first.

Why offer a direct-max and age-based mode?

Some people know a measured max heart rate already, while others only want a rough estimate based on age.

Is this a medical or training prescription?

No. It is a general fitness-planning estimate only and should not replace medical guidance or individualized testing.

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Health ToolsUpdated April 11, 2026