Power Bank Capacity & Recharge Calculator

Calculate real-world full charges for your phone, tablet, or laptop from a portable battery pack, accounting for 3.7V to 5V voltage step-up efficiency losses.

1. Power Bank Specs

Power Bank Rated Capacity (mAh) Common sizes: 10,000 mAh, 20,000 mAh, 26,800 mAh, 50,000 mAh

Internal Cell Voltage (Volts)

Transfer Efficiency (%) Average efficiency is ~75% to 85%

2. Target Device Specs

Device Preset

Device Battery Capacity (mAh)

Device Voltage (Volts)

Estimated Full Recharges

4.6 Charges

Total Energy: 74 Wh | Effective Output: 59.2 Wh

Total Nominal Wh: 74.0 Wh

Effective Usable Wh: 59.2 Wh

TSA Flight Limit (100Wh): PASSED (Carry-On Approved)