Battery Life Calculator
Runtime from battery capacity and circuit current draw.
Inputs
%
%
%
Results
Runtime (hours)
16.49
Runtime (days)
0.69
Runtime (minutes)989.4
Effective Current (mA)100
Usable Capacity (mAh)1,649
Total Energy (Wh)7.4
Usable Energy (Wh)6.1
Power Draw (mW)370
Power Consumption W0.37
Days To Depletion0.69
How to Use This Calculator
- Enter your battery capacity (mAh), average current draw (mA), and nominal voltage (V).
- Set the duty cycle (%) — the fraction of time the circuit is actively drawing full current.
- Enter self-discharge rate (%/month) and discharge efficiency (%) for your battery chemistry.
- Review runtime in hours and days, effective current draw, and usable capacity.
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