Battery health percentage calculator
Calculate full-charge capacity as a percentage of design capacity.
Calculate full-charge capacity as a percentage of design capacity.
Estimated result
Use the calculator
Enter design capacity, full charge capacity. The calculation runs locally in this browser and returns estimated battery health percentage.
Read the estimate carefully
Use the result as a comparison point for similar sessions, not as a hidden sensor reading or a hardware diagnosis.
- Capacity values must come from a trustworthy device or diagnostic source.
- One reading does not establish a long-term trend.