Battery Runtime Calculator
Estimate runtime from stored energy, load power, and efficiency.
Wh and W each 0.000001–1000000000; efficiency 0–100%. Constant load power only. No converter efficiency inferred; excludes Peukert effect, temperature, aging, voltage cutoff and changing loads. Not a guaranteed runtime.
t(h) = E(Wh) ÷ P(W) ÷ η(%) × 100
Result
A QUICK WALKTHROUGH
How to use this tool
- Choose the mode and enter the values.
- Read the formula and limitations before interpreting the result.
Formula and limits
Wh and W each 0.000001–1000000000; efficiency 0–100%. Constant load power only. No converter efficiency inferred; excludes Peukert effect, temperature, aging, voltage cutoff and changing loads. Not a guaranteed runtime. t(h) = E(Wh) ÷ P(W) ÷ η(%) × 100
GOOD TO KNOW
Common questions
Does this evaluate a real component or circuit?
No. This is a nominal calculation from the inputs, not component selection or a safety assessment.