Wireless Charging Time Calculator

Estimate charging time based on battery capacity, charger wattage, and efficiency — with heat warnings and charger recommendations.

Ad · calculator-top

Quick Select

Battery Capacity

Found in your device specs

mAh

Charger Wattage

The wattage your charger delivers to your device

Charging Efficiency

Wireless: 75–85%. Typical default: 80%

80%

Charging Range

Start at

20%

End at

100%

Estimated Time

16 min

20% → 100% (80% of battery)

Effective Power

12.0W

15W × 80% efficiency

Full Charge Time

20 min

0% → 100%

Charging Speed

Fast

Recommendation: Good. A 15W Qi2 charger is the sweet spot for most Android phones.

Efficiency Score

83%

Good

~2.6W lost to heat at 15W

Rated

15W

Effective

12.4W

Lost

2.6W

Heat Score

Cool

Cool expected

Optimal charging conditions.

Speed Comparison

1 hr

7.5W

40 min

10W

30 min

15W

20 min

25W

12 min

50W

6 min

Ad · calculator-sidebar

Estimates assume constant current charging. Actual times may vary due to temperature, background processes, and charger quality. Charging slows above 80% to protect battery health.

Not sure if your device supports wireless charging?