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Technology & digital

Power bank charge cycles calculator

Power bank charge cycles calculator: mAh measures charge, Wh measures energy.

Your result

Complete the fields and calculate.

Calculation method and formula

(Power bank capacity [mAh] × Power bank cell voltage [V]) ÷ (Device battery capacity [mAh] × Device battery voltage [V]) × Overall efficiency [%] ÷ 100

Understand the inputs

Power bank capacity
Unit: mAh. Minimum 0.01. Use a measured value or your own assumption.
Power bank cell voltage
Unit: V. Minimum 0.01. Use a measured value or your own assumption.
Device battery capacity
Unit: mAh. Minimum 0.01. Use a measured value or your own assumption.
Device battery voltage
Unit: V. Minimum 0.01. Use a measured value or your own assumption.
Overall efficiency
Unit: %. Minimum 1. Maximum 100. Use a measured value or your own assumption.

Assumptions and limitations

mAh measures charge, Wh measures energy. Voltage is therefore needed for energy comparisons. Efficiency, temperature, aging and charging curves can differ from the constant model.

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

Worked example

Illustrative values. Replace them with your own inputs for your calculation.

Power bank capacity
20000 mAh
Power bank cell voltage
3.7 V
Device battery capacity
5000 mAh
Device battery voltage
3.85 V
Overall efficiency
80 %
Example result3.08 full charges

Usable power bank energy: about 59.2 Wh.

Model revision: October 17, 2026 · How CleverCalc works

FAQ

Frequently asked questions

How does Power bank charge cycles calculator work?+

(Power bank capacity [mAh] × Power bank cell voltage [V]) ÷ (Device battery capacity [mAh] × Device battery voltage [V]) × Overall efficiency [%] ÷ 100. mAh measures charge, Wh measures energy. Voltage is therefore needed for energy comparisons. Efficiency, temperature, aging and charging curves can differ from the constant model.

What assumptions should I consider for this result?+

mAh measures charge, Wh measures energy. Voltage is therefore needed for energy comparisons. Efficiency, temperature, aging and charging curves can differ from the constant model. The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

How accurate is the result?+

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation. Prices, measurements and model assumptions determine how well the result represents your situation.

Is this calculator free?+

Yes. Calculations and PDF export work without an account or registration.

What happens to my inputs?+

Calculations run in your browser. Results are saved locally only when you add them to My results; favourites and history are also local. Shared links contain your values. The currency tool requests the selected currencies from its rate provider without sending your amount.

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