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Calcimator

Smartwatch Battery Life Calculator

Estimate smartwatch battery duration based on battery capacity, display settings, GPS usage, heart rate monitoring, and connectivity features.

Inputs

Results

Battery life (days)

2.7

Workout mode (hours)

10.6

Battery life (hours)63.8
Avg power draw (mW)18.1
GPS-only mode (hours)12
Charges per year137
How to Use This Calculator
  1. Enter your smartwatch battery capacity (mAh) — check the manufacturer spec sheet or teardown data.
  2. Select display type (AMOLED, LCD, or MIP/transflective) and set brightness and screen-on time.
  3. Enter daily GPS usage (min/day), heart rate monitoring mode, and whether cellular LTE is enabled.
  4. Set your average daily notification count to account for Bluetooth and vibration motor draw.
  5. Review battery life in days and hours, average power draw (mW), and workout-mode duration.
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