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Laptop Battery Health

Calculate Laptop Battery Health instantly with the exact formula and a worked example.

Laptop Battery Health

Current full charge capacitymWh
Design capacitymWh
Runtime on a new batteryh
Battery health
84%
Calculate Laptop Battery Health instantly with the exact formula and a worked example.
Wear
16%
Expected runtime now
6.72h
Rating
Good condition

More about: Laptop Battery Health

What it calculates

The “Laptop Battery Health” calculator computes Battery health in % from 3 parameters: current full charge capacity (mWh), design capacity (mWh), runtime on a new battery (h).

A handy everyday calculator for daily tasks.

Example calculation

With parameters Current full charge capacity = 42,000 mWh, Design capacity = 50,000 mWh, Runtime on a new battery = 8 h the result is 84 %.

How to use

  1. Enter current full charge capacity, design capacity and runtime on a new battery — each field above is adjustable with a slider.
  2. Battery health (%) is calculated automatically as you type.
  3. Check the worked example below to see the formula applied to real numbers.
  4. Copy the result or bookmark this calculator.

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FAQ

How is Laptop Battery Health calculated?
The Laptop Battery Health calculator computes Battery health (in %) from current full charge capacity, design capacity, runtime on a new battery. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Laptop Battery Health calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.

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