Powerbank charge estimate
Compare stored energy in a powerbank and a device battery. Milliamp-hour labels alone cannot be compared reliably when the battery voltages differ.
Your inputs
Start with the example values, then replace them with your own. For tables, keep the vertical bar separators and use a dot for decimals.
Battery labels, voltage and conversion losses vary. This estimate is not electrical safety advice. Follow the device manufacturer’s charging instructions.
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Result and workspace
Use the start button to open your result or activity.
How it works
Charge equivalents = (bank mAh × bank V × efficiency / 100) / (device mAh × device V).
Worked example
These sample results use the original example inputs in the form. They do not change when you edit your inputs; your own result appears in the workspace.
- Available energy: 27.75 Wh
- Device battery energy: 15.4 Wh
- Charge equivalents: 1.8019
Read the result carefully
Results depend on the values and assumptions shown above. Change one input at a time to see its effect. A blank or unavailable result means the data does not support a calculation; it is not zero.