mAh to Amp Calculator
Convert battery capacity from milliampere-hours (mAh) to continuous discharge current in amperes (A) and milliamperes (mA) based on your device's usage time.
mAh to Amp Calculator
How to Use mAh to Amp Calculator
Converting your battery capacity from mAh into continuous running current (amps) is simple when you know your usage time. Follow these steps for an accurate calculation:
- 1Enter battery capacity. Find the capacity rating on your battery's label (e.g., 5000) and enter it into the mAh field.
- 2Enter usage time. Input the estimated hours your device will run or how fast you plan to discharge the battery.
- 3Click Calculate. Press the calculate button to see the continuous current.
- 4Review results. Your final output will display the current flow in both amps (A) and milliamps (mA).
How to Calculate mAh to Amp
To mathematically determine the continuous current draw (amps) from a battery rated in milliampere-hours (mAh), you need to divide the capacity by 1000 to convert to Amp-hours (Ah), and then divide by your specific discharge time.
Conversion Formula
Practical Calculation Example
Let's calculate the continuous current for a power bank with the following parameters:
- Battery capacity: 5000 mAh
- Usage time: 5 hours
Step 1: Convert mAh to Ah
5000 mAh ÷ 1000 = 5 Ah
Step 2: Divide by Time
5 Ah ÷ 5 hours = 1 A
Final Answer
Continuous Current = 1 amp
mAh to Amp Chart
The table below provides quick reference conversions for common battery capacities. Note: These values assume a complete continuous discharge over exactly 1 hour. Actual current will vary proportionally if your runtime is longer or shorter.
| Battery Capacity (mAh) | Capacity (Ah) | Current (A) |
|---|---|---|
| 1000 mAh | 1 Ah | 1 A |
| 2000 mAh | 2 Ah | 2 A |
| 3000 mAh | 3 Ah | 3 A |
| 5000 mAh | 5 Ah | 5 A |
| 8000 mAh | 8 Ah | 8 A |
| 10000 mAh | 10 Ah | 10 A |
| 15000 mAh | 15 Ah | 15 A |
| 20000 mAh | 20 Ah | 20 A |
mAh to Amp Calculator Frequently Asked Questions
You cannot convert mAh (capacity) directly to Amps (current) without knowing the time factor. mAh measures total stored energy, while Amps measure the flow of electricity at a given moment. To find Amps, you must divide the mAh capacity by the number of hours the battery is being discharged.
The formula involves time. First, convert mAh to Ah by dividing by 1000. Then, divide the Ah by the hours of runtime to find the continuous current draw in Amps. For example, if a 3000 mAh battery drains completely in 2 hours, it delivered 1.5 Amps of current (3 Ah divided by 2 hours = 1.5A).
A 10000mAh battery does not equal a fixed number of amps. It contains 10 Amp-hours of capacity. It could output 10 Amps for 1 hour, 1 Amp for 10 hours, or 5 Amps for 2 hours. The actual amperage flowing from the battery depends entirely on the electrical resistance of the device connected to it.
Devices that draw power, like chargers or motors, show Amps to indicate how much current they require or supply instantly. Batteries, which store power, show mAh or Ah to indicate their total energy reservoir. Together, these numbers help calculate how long a specific battery will run a device.
Higher mAh means more total energy capacity, but it does not automatically mean the battery outputs more Amps. A battery's maximum instantaneous output current is determined by its discharge "C-rating," not its mAh capacity. However, larger capacity batteries often have higher max current limits.