QUICK ANSWERStart with the tool that matches your immediate input.
Open Maximum Heart Rate Calculator first when its stated purpose matches the result you need now. Use Target Heart Rate Calculator only when it solves a separate next task.
This guide is for people using general educational wellness and planning tools. Start with Maximum Heart Rate Calculator when your immediate task is to use the Maximum Heart Rate Calculator to calculate a transparent estimate and understand the next step. Move to Target Heart Rate Calculator only when you also need to use the Target Heart Rate Calculator to calculate a transparent estimate and understand the next step.
The goal is not to run two tools automatically. It is to finish the first narrow task, inspect its result, and then decide whether Target Heart Rate Calculator solves a genuinely different next step.
Both tools sit in Health & Wellness, but they handle different inputs or outcomes. Keeping those roles separate reduces repeated work and makes verification easier.