Battery Life Calculator – Estimate Your Battery Life Quickly and Accurately

Have you ever wondered how long your device will last on a full charge? Whether it’s your smartphone, tablet, or DIY electronics project, knowing your battery life is essential for planning usage and avoiding unexpected shutdowns. Our Battery Life Calculator makes this simple and precise.

How It Works

Our calculator estimates battery life based on four key factors:

1. Battery Capacity (mAh) – The amount of energy your battery can store, usually indicated on the battery label.

2. Device Consumption (mA) – The current your device draws during operation, which you can find in device specifications.

3. Battery Voltage (V) – Most Li-ion batteries operate at 3.7V, but you can adjust if your battery differs.

4. Battery Efficiency (%) – Accounts for energy losses during discharge, typically between 85-95%.

The formula used is:

Battery Life (hours) = (Capacity × Voltage × Efficiency) / Device Power Consumption

The calculator then converts this into hours and even estimates days based on 8 hours of daily usage.

Features

• Accurate Estimates: Takes voltage and efficiency into account for realistic results.

• Easy to Use: Simple input fields for battery specs and device consumption.

• Detailed Results: Shows battery life in hours, fractional hours, and estimated days (8h/day).

• Reset Option: Quickly clear inputs to calculate for a different device or battery.

How to Use

1. Enter your battery’s capacity (mAh).

2. Enter your device’s consumption (mA).

3. Adjust voltage if it’s not 3.7V.

4. Set battery efficiency (default is 90%).

5. Click Calculate to see your estimated battery life.

6. Use Reset to clear values and start again.

Why It’s Useful

• Smartphone Users: Know how long your phone will last during heavy usage or travel.

• DIY Electronics Projects: Ensure your microcontroller or IoT device runs reliably without surprise shutdowns.

• Battery Management: Plan charging cycles to maximize battery lifespan.

Try our Battery Life Calculator today and never be caught with a dead battery again!