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Heart Rate Zone Calculator Pro

Free client-side Karvonen heart rate zone calculator

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Self-Reported Revenue

The creator of Heart Rate Zone Calculator Pro has reported monthly revenues of $0.

This figure was last updated September 6, 2026, and has not been independently verified.

About

To provide a 100% free, lightweight, and client-side web utility that calculates accurate heart rate training zones using the Karvonen formula without tracking user data or requiring sign-ups.

People

Global Tool Box Founder