How do cellphones calculate heart rate?

How do you calculate a heart rate? How do you calculate a heart rate

  • Answer:

    Check your pulse at the wrist and count how many heartbeats there are in 15 seconds, then multiply by 4. That gives your heartrate

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Check your pulse at the wrist and count how many heartbeats there are in 15 seconds, then multiply by 4. That gives your heartrate

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