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Tool Guide May 24, 2026 8 min read
Phone Battery Charging Calculator
Calculate how long your specific phone will take to charge wirelessly. Enter your phone battery size and charger wattage for an instant estimate.
Key Fact
Find your phone battery size in the manufacturer spec sheet, then use the charging calculator for an accurate estimate based on your charger wattage and efficiency.
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Table of Contents
Phone Battery Charging Calculator
Use the Charging Time Calculator to get a personalised estimate for your phone and charger combination.
Common Phone Battery Sizes
| Phone | Battery Size |
| iPhone 16 Pro Max | ~4685 mAh |
| iPhone 16 Pro | ~3577 mAh |
| Galaxy S25 Ultra | ~5000 mAh |
| Galaxy S25 | ~4000 mAh |
| Galaxy Z Fold 6 | ~4400 mAh |
| Pixel 9 Pro XL | ~5060 mAh |
| Pixel 9 | ~4700 mAh |
| OnePlus 13 | ~6000 mAh |
How to Use the Calculator
- Look up your phone battery size in mAh from the manufacturer spec sheet
- Open the Charging Time Calculator
- Set battery size to your phone value
- Set wattage to your charger rated output
- Adjust efficiency (80% for wireless, 92% for wired)
- Optionally set start and end percentage for partial charges
Understanding the Result
The calculator shows:
- Estimated charge time for your inputs
- Effective wattage after efficiency loss
- Full charge comparison across multiple wattages
The comparison chart helps you visualise whether upgrading your charger would make a meaningful difference for your battery size.
Tips for Accurate Estimates
- Use 78-82% efficiency for standard Qi wireless charging
- Use 83-86% efficiency for Qi2 certified chargers
- Use 90-95% efficiency for USB-C PD wired charging
- Add 25-30% to estimated time if you actively use the phone while charging
Related Pages
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Frequently Asked Questions
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Wireless Charging Editorial Teambattery calculatormahphone charging timetool
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