THE CLEVER NETWORKCleverDocuAVAILABLE NOWwww.cleverdocu.deCleverStudiIN DEVELOPMENTwww.cleverstudi.de
Translate pageChoose language
Back to all calculators

Technology & digital

Charging time calculator

Charging time calculator: mAh measures charge, Wh measures energy.

Your result

Complete the fields and calculate.

Calculation method and formula

Energy to charge [Wh] × Share to charge [%] ÷ 100 ÷ (Charging power [W] × Charging efficiency [%] ÷ 100)

Understand the inputs

Energy to charge
Unit: Wh. Minimum 0.01. Use a measured value or your own assumption.
Share to charge
Unit: %. Minimum 0.01. Maximum 100. Use a measured value or your own assumption.
Charging power
Unit: W. Minimum 0.01. Use a measured value or your own assumption.
Charging 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.

Energy to charge
60 Wh
Share to charge
80 %
Charging power
30 W
Charging efficiency
85 %
Example result1.88 hours

Idealised charging time; charging electronics and tapering near full can extend real time.

Model revision: October 17, 2026 · How CleverCalc works

FAQ

Frequently asked questions

How does Charging time calculator work?+

Energy to charge [Wh] × Share to charge [%] ÷ 100 ÷ (Charging power [W] × Charging 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.

Toolbox

Related calculators

Technology & digital

Download time calculator

Open

Technology & digital

Upload time calculator

Open

Technology & digital

Mbps ↔ MB/s converter

Open

Technology & digital

Streaming data usage calculator

Open
Related document on CleverDocuFree document templates and practical PDF tools – directly in your browser with no sign-up.