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THE FEUTEX TOOLKIT

Power Bank Energy Estimate

Estimate delivered energy and full device charges from battery capacities and nominal voltages.

Home workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaDelivered Wh = mAh × nominal V ÷ 1000 × efficiency

How to use this tool

  1. Load the example or enter your own values in the labeled fields.
  2. Run the tool and review the result and assumptions.
  3. Copy or download the result for your workflow.

Try this example

{"bank": 20000, "bankV": 3.7, "device": 5000, "deviceV": 3.7, "efficiency": 80}

Accuracy and scope

Nameplate estimate only; charging protocol, temperature and battery condition affect delivery.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.