Free calculator that estimates how many hours of battery life your smartwatch has left. Select your model and the features you are currently using for a realistic battery estimate.
Every smartwatch has a base battery life under mixed daily use. Features such as Always-On Display, GPS, continuous heart rate, SpO2, LTE and music streaming significantly increase power consumption.
This tool starts with the typical full-charge life of your model, reduces it according to the features you enable, then scales the result by your current battery percentage to give a realistic remaining time.
How accurate is the Smartwatch Battery Estimator? It provides a good real-world estimate based on typical power draw of common features. Actual results vary with brightness, temperature and age of the battery.
Does Always-On Display drain a lot of battery? Yes. Always-On Display is one of the biggest battery consumers on most smartwatches and can reduce total runtime by 20–40%.
Why does GPS use so much power? GPS requires constant communication with satellites and is one of the most power-hungry features, especially during long outdoor activities.
Can I use this for Apple Watch, Galaxy Watch and Garmin? Yes. The estimator includes common models from Apple, Samsung, Google, Garmin, Fitbit and Amazfit, plus a generic option.