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Choose what your account keeps in step on every device where you are signed in.

  • My tools

    Always synced: the tools on your board, their order and size.

  • The windows open on your start page, including what you typed in them.

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  • Keeps your pipeline and saved recipes on all your devices. Your files are never synced – only the steps and settings.

Turning something off removes it from your account straight away. Your devices keep their own copy.

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Your choice is stored in this browser only. Notifications never show personal content such as a message or a number. They work while a Synsi tab is open; closed tabs get none.

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Heart Rate Zone Calculator

Estimate five training heart-rate zones from age-predicted maximum heart rate.

My tools →
years

Estimated maximum heart rate

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Age-based heart-rate estimates can differ from your individual maximum.

Runs in your browser – your data never leaves your device Also available via our free API

How to use the Heart Rate Zone Calculator

  1. 1 Enter the requested details.
  2. 2 Review the estimate and the limitations shown with it.

How the estimate works

Maximum heart rate is estimated with the Tanaka equation (208 − 0.7 × age). Zones are shown as five 10-percentage-point ranges from 50% to 100% of that estimate. Age-based formulas can differ substantially from an individual’s measured response. Source: Tanaka et al., Journal of the American College of Cardiology.

How to use this calculator

Enter the requested values and review the result alongside the limits of the estimate.

Important limitations

This result is for general information. Individual circumstances can change what is appropriate; consult a qualified professional when making health decisions.

Frequently asked questions

How does this calculator work?

Maximum heart rate is estimated with the Tanaka equation (208 − 0.7 × age). Zones are shown as five 10-percentage-point ranges from 50% to 100% of that estimate. Age-based formulas can differ substantially from an individual’s measured response. Source: [Tanaka et al., Journal of the American College of Cardiology](https://pubmed.ncbi.nlm.nih.gov/11153730/).

Is this a diagnosis or personalized advice?

No. This is an informational estimate and does not replace professional advice.

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