Ampere-Hours to Milliampere-Hours Converter
Convert Ah to mAh instantly for batteries, power banks, and solar systems
Conversion Result
1 Ah = 1,000 mAh
Popular Battery Capacity Conversions
| Ampere-Hours (Ah) | Milliampere-Hours (mAh) | Typical Device |
|---|---|---|
| 0.001 Ah | 1 mAh | Tiny wearable sensors |
| 0.5 Ah | 500 mAh | Bluetooth headphones |
| 1 Ah | 1,000 mAh | Small portable charger |
| 2 Ah | 2,000 mAh | Smartphone battery |
| 3 Ah | 3,000 mAh | Power bank standard |
| 5 Ah | 5,000 mAh | Large smartphone |
| 10 Ah | 10,000 mAh | Tablet battery |
| 12 Ah | 12,000 mAh | Motorcycle battery |
| 20 Ah | 20,000 mAh | High-capacity power bank |
| 50 Ah | 50,000 mAh | Deep cycle battery |
| 100 Ah | 100,000 mAh | Marine battery |
| 200 Ah | 200,000 mAh | RV/Solar storage |
Conversion Formula & Steps
The conversion formula:
mAh = Ah × 1,000
Since 1 Ah equals 1,000 mAh, multiply any Ah value by 1,000 to get mAh
1
Identify your Ah value: Check your battery specification label or product manual for the ampere-hour rating
2
Multiply by 1,000: Take your Ah value and multiply it by 1,000 to convert to milliampere-hours
3
Verify the result: Double-check your calculation to ensure accuracy for battery selection or comparison
Quick Example: A 2.5 Ah battery converts to mAh as follows: 2.5 × 1,000 = 2,500 mAh. This means a 2.5 Ah battery and a 2,500 mAh battery have identical capacity.
Visual Capacity Comparison
Smartphone
3 Ah
= 3,000 mAh
Power Bank
20 Ah
= 20,000 mAh
Car Battery
60 Ah
= 60,000 mAh
Solar Battery
200 Ah
= 200,000 mAh
Real-World Applications
Mobile Devices
Smartphones and tablets typically list battery capacity in mAh (2,000-6,000 mAh range). Converting to Ah helps compare with larger batteries.
Power Banks
Portable chargers range from 10,000 mAh (10 Ah) to 30,000 mAh (30 Ah). Knowing both units helps calculate charging cycles.
Cordless Equipment
Drills and power equipment use Ah ratings (1.5-5 Ah). Converting to mAh allows comparison with smaller electronics.
Electric Vehicles
EV batteries measure in Ah (50-100+ Ah). Understanding mAh equivalents helps relate to everyday devices.
Camping & RV
Deep cycle batteries (100-200 Ah) power camping setups. Converting to mAh shows how many device charges are possible.
Solar Systems
Solar battery banks measure in Ah (200-400 Ah). Knowing mAh equivalents helps calculate backup capacity for devices.
Extended Conversion Reference
| Ah | mAh | Ah | mAh |
|---|---|---|---|
| 0.001 | 1 | 15 | 15,000 |
| 0.01 | 10 | 20 | 20,000 |
| 0.1 | 100 | 25 | 25,000 |
| 0.5 | 500 | 30 | 30,000 |
| 1 | 1,000 | 50 | 50,000 |
| 1.5 | 1,500 | 75 | 75,000 |
| 2 | 2,000 | 100 | 100,000 |
| 2.5 | 2,500 | 150 | 150,000 |
| 3 | 3,000 | 200 | 200,000 |
| 5 | 5,000 | 250 | 250,000 |
| 7.5 | 7,500 | 300 | 300,000 |
| 10 | 10,000 | 500 | 500,000 |
Frequently Asked Questions
What is the difference between Ah and mAh?
+
Both measure electric charge capacity, but differ in scale. Ah (ampere-hours) represents larger capacities used for car batteries and solar systems, while mAh (milliampere-hours) measures smaller capacities in smartphones and portable devices. One Ah equals exactly 1,000 mAh.
How do I convert 5 Ah to mAh?
+
Multiply 5 by 1,000 to get 5,000 mAh. The calculation is: 5 Ah × 1,000 = 5,000 mAh. This is equivalent to a typical large smartphone battery capacity.
Why do phones use mAh instead of Ah?
+
Mobile devices use mAh because their batteries have relatively small capacities. Expressing 3,000 mAh is clearer than 3 Ah for consumer understanding. Larger batteries like car or marine batteries use Ah because their capacities would create unwieldy mAh numbers (a 100 Ah battery would be 100,000 mAh).
Can I directly compare batteries using Ah and mAh?
+
Yes, after conversion. A 2 Ah battery equals 2,000 mAh, so you can directly compare it to a 2,500 mAh battery. The 2,500 mAh battery has greater capacity. Always convert to the same unit before comparing.
How many times can a 20 Ah power bank charge my 3,000 mAh phone?
+
First convert: 20 Ah = 20,000 mAh. Theoretically 20,000 ÷ 3,000 = 6.67 charges. However, accounting for conversion efficiency losses (typically 20-30%), expect 4-5 full charges in real-world conditions.
Does higher Ah or mAh always mean better battery?
+
Not always. While higher capacity means longer runtime, other factors matter: voltage, discharge rate, chemistry type, and physical size. A 5 Ah lithium battery may outperform a 7 Ah lead-acid battery in weight and efficiency despite lower capacity.
What is a good power bank capacity in Ah?
+
For daily use, 10-20 Ah (10,000-20,000 mAh) provides 2-4 smartphone charges and remains portable. For travel or camping, 20-30 Ah (20,000-30,000 mAh) offers extended power. Beyond 30 Ah becomes heavy and better suited for stationary applications.
How does temperature affect Ah and mAh ratings?
+
Cold temperatures reduce effective capacity while heat can damage batteries. A 5 Ah battery might only deliver 3.5-4 Ah in freezing conditions. Manufacturers typically rate capacity at 25°C (77°F). Extreme temperatures decrease both performance and lifespan.
References
- International Electrotechnical Commission (IEC). “IEC 60050 – International Electrotechnical Vocabulary.” https://www.electropedia.org/
- Battery University. “BU-402: What Is C-rate?” Cadex Electronics Inc. https://batteryuniversity.com/
- National Institute of Standards and Technology (NIST). “Guide for the Use of the International System of Units (SI).” NIST Special Publication 811. https://www.nist.gov/pml/special-publication-811
- IEEE Standards Association. “IEEE Standard for Electrical and Electronics Terms.” IEEE Std 100-2000.