Battery Runtime
HOME & PROJECTS
Battery Runtime
Estimate runtime from energy capacity and a constant power draw.
UNDERSTAND YOUR RESULT
How it works
Estimate runtime from energy capacity and a constant power draw.
THE CALCULATIONruntime = battery Wh × usable fraction / load W
Using this calculator
Enter battery energy (wh), constant load (w), usable energy (%). runtime = battery Wh × usable fraction / load W.
What to keep in mind
A quantity estimate using your measurements, not a structural design, building-code check or purchasing specification. Allow for real shapes, cutting and the product instructions.
Frequently asked questions
Are my entries saved?
No. Calculator inputs remain in the current page and are cleared when you reload or leave. The tools do not upload your entries.
Why are results rounded?
The display is rounded for readability. Calculations use unrounded intermediate values. An estimate should not be interpreted as an exact measurement.