Step-by-step instructions
- Enter or select Voltage (V).
- Enter or select Capacity (Ah).
- Enter or select Efficiency.
- Enter or select Load (W).
- Tap Calculate.
- Review the result shown directly below the calculator.
Battery Runtime Watts Calculator
Estimate runtime hours = V×Ah×efficiency/load.
How to use the Battery Runtime Watts Calculator
Estimate runtime hours = V×Ah×efficiency/load.
What the inputs mean
- Voltage (V)
- Enter the value requested by this field label.
- Capacity (Ah)
- Enter the full amount, target, goal, or capacity used as the comparison value.
- Efficiency
- Enter the value requested by this field label.
- Load (W)
- Enter the value requested by this field label.
Formula or calculation method
The calculator applies the standard mathematical relationship for the labeled inputs and returns the computed result automatically.
Example
Try entering realistic values for Voltage (V) and Capacity (Ah), then tap Calculate to see how the result changes.
How to understand the result
Use the result as an estimate based on the values you entered. For planning decisions, double-check that the input units and assumptions match your real situation.
Tip: Keep all values in compatible units and use values from the same time period when the calculator compares two amounts.