How the Calculator Works

Many users assume that a smartphone’s battery life depends solely on its battery capacity. In reality, autonomy is a complex equation where the display type (OLED or IPS), current screen brightness, and other parameters play a significant role. Our calculator takes these factors into account, providing a forecast for seven different usage scenarios, ranging from watching YouTube videos to extreme loads in heavy games like Genshin Impact. TomHost helps you determine with a relatively high degree of accuracy how much real-world runtime remains for your specific device, considering your selected settings and current battery percentage.

Why Estimate Battery Life

The calculator is useful for both everyday users and those working in the field. Tourists and hunters with rugged smartphones will see the actual offline battery life without access to power outlets. Tablet owners will understand if their charge is sufficient for a long flight or a full workday. If you are planning to buy a new phone, you can compare how many hours of active use different device categories provide. The tool also helps evaluate the impact of settings; for example, by lowering brightness or enabling Dark Mode, you can add several hours to your runtime. All calculations are adapted to modern realities, accounting for Wi-Fi and mobile networks, different screen types, and the actual energy consumption of apps.