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Calcimator

Fitness Tracker Accuracy Calculator

Estimate step-counting and heart-rate measurement accuracy based on sensor quality, wear fit, activity type, and skin tone.

Inputs

Results

Step accuracy (%)

96.82

Heart rate accuracy (%)

94

Step MAPE (%)3.18
Estimated step error318
HR MAPE (%)6
HR error (bpm)4.3
Overall accuracy score95.13
Steps Reported10,159
Steps Reported Mid9,841
Hr Reported Estimate74.2
How to Use This Calculator
  1. Set the accelerometer/PPG sampling rate (Hz) matching your wearable's specification.
  2. Select your activity type (walking, running, cycling, elliptical, or weight training).
  3. Rate wrist fit tightness (1–10) and your Fitzpatrick skin type — both affect optical sensor accuracy.
  4. Choose the number of sensor LEDs and enter your reference step count and actual heart rate.
  5. Review estimated step accuracy (%), HR accuracy (%), and error values to benchmark your device.
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