About Us
Battery Runtime Calculator is a free web tool that helps you calculate how long your devices will run on battery power.
Why we built this
We created this calculator for DIY enthusiasts, campers, and anyone who needs reliable backup power during blackouts. Instead of complex formulas, we provide simple presets and real-world device consumption data.
What we offer
- ✓ Simple calculator with device and battery presets
- ✓ Support for powerbanks, power stations, and batteries
- ✓ Accurate calculations considering efficiency losses
- ✓ Free to use, no registration required
Questions or suggestions? Visit our contact page.