Battery life Calculator
Enter value and click on calculate. Result will be displayed.
BLT = Capacity of battery / Consumption of the device x 0.70
What is a Battery Life Calculator?
A Battery Life Calculator is a tool that estimates how long a battery will last based on its capacity (Ah or mAh), device power consumption (W or A), and efficiency factors. It helps determine the expected runtime of batteries used in electronics, electric vehicles, solar systems, and backup power applications.
Why Use a Battery Life Calculator?
- Optimizes Battery Usage – Helps manage battery life for portable devices.
- Prevents Unexpected Shutdowns – Ensures devices don't run out of power unexpectedly.
- Useful for Multiple Applications – Works for smartphones, laptops, power tools, EVs, and off-grid power systems.
- Supports Different Battery Types – Calculates lifespan for alkaline, lithium-ion, lead-acid, NiMH, etc.
When is a Battery Life Calculator Used?
- For Smartphones & Laptops – Estimates how long a device will run before needing a recharge.
- For Electric Vehicles (EVs) – Helps predict driving range based on battery size.
- For Solar & Off-Grid Systems – Determines battery backup duration.
- For Power Tools & RC Devices – Ensures batteries last for the required operation time.
- For UPS & Backup Power – Helps size batteries for critical power supply needs.
Did this Calculator help you?

Thanks for the feedback
Search for Calculator
Explore thousands of free calculators trusted by millions worldwide.