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Calculator Tools
Battery Calculators

C-Rate Calculator

Battery C-rate from current and capacity, with the charge or discharge time it implies.

Enter values

Results update as you type.

Result

C-rate

0.5 C

Current
50 A
Full discharge time
2 hours
In minutes
120
Assessment
Gentle — best for battery life

About the C-Rate Calculator

Battery C-rate from current and capacity, with the charge or discharge time it implies.

Also known as: c rating battery, discharge rate calculator, battery c rate, charge rate calculator.

How to use this calculator

  1. Enter calculate, capacity.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

C-rate = current ÷ capacity in Ah

Worked example

Using the values pre-filled in the calculator above:

  • Calculate: C-rate
  • Capacity = 100 Ah
  • Current = 50 A

the calculator returns:

  • C-rate: 0.5 C
  • Current: 50 A
  • Full discharge time: 2 hours
  • In minutes: 120