basic

Smartphone Battery Charge Time Calculator

Charge time = (capacity × % needed) / (charger W / voltage).

Estimates smartphone or device charging time from battery capacity (mAh), charger wattage, current charge level, and charging efficiency.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

T_hr = (mAh × ΔSoC) / (W / V × 1000 × η)

In depth

Estimates smartphone or device charging time from battery capacity (mAh), charger wattage, current charge level, and charging efficiency.