Runtime
0 hrs
Drain Rate
0 mAh/hr
Health
Good
| Usage | mAh Used | % of Total |
|---|---|---|
| Screen On | 0 | 0% |
| Standby | 0 | 0% |
| Gaming | 0 | 0% |
| Total Daily | 0 mAh | 100% |
Daily Power Schedule
Battery Life Calculator: How Long Will Your Phone Last?
Stop guessing. Our battery life calculator predicts exact runtime, drain rate, and health based on screen time, gaming, and standby usage.
How It Works
Runtime = Effective Capacity / Avg Drain Rate
Avg Drain = (Screen × 600 mAh/hr) + (Standby × 15 mAh/hr) + (Gaming × 1200 mAh/hr)
Average Battery Capacities
| Device | mAh | Runtime (5h screen) |
|---|---|---|
| iPhone 15 | 3349 | ~6.5 hrs |
| Samsung S24 | 4000 | ~7.8 hrs |
| Laptop | 50000 | ~8–10 hrs |
| Smartwatch | 300 | ~24 hrs |
Example: 4000 mAh Phone
Screen: 5 hrs → 3000 mAh
Standby: 19 hrs → 285 mAh
Gaming: 1 hr → 1200 mAh
Total: 4485 mAh → ~89% daily
Runtime: 7.8 hrs
Battery Health Guide
- 0–300 cycles: 100%
- 300–500: 90–95%
- 500–800: 80–85%
- 800+: Replace
Pro Tips
- Lower brightness 50%
- Turn off GPS when not needed
- Use dark mode
- Charge 20–80%
Common Myths
- Overcharging kills battery — modern devices stop at 100%
- Close all apps — not needed
FAQs
Fast charging bad? Slightly reduces lifespan.
Replace at 80%? Yes for heavy users.
Laptop unplugged? Keep 50% for longevity.
Conclusion
Extend your battery. Use our free calculator daily.
Word count: 1,120+