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Milliamps to Amps (mA to A) Conversion Guide 2025 Updated

Ampace - 2025-04-26

What Is an Ampere?
What Is a Milliampere?
How to Convert mA to A
How to Convert A to mA
What’s the Difference Between Ah and Wh?
Ampace Portable Power Station Explained

Nowadays, electrical appliances are part of daily life, but do you understand the units of electricity? Milliamps (mA) and amps (A) are units of current. Understanding their concepts and conversion methods can help you calculate and save energy, leading to significant savings in money and time, especially when choosing energy-efficient appliances. In this guide, Ampace will explain the essentials of converting amps to milliamps.

What Is an Ampere?

An ampere (A), or amp, is the standard unit of electric current in the International System of Units (SI). It measures the rate at which electric charge flows through a circuit. Think of it as the volume of water flowing through a pipe—the higher the amperage, the greater the current.

What Is a Milliampere?

A milliampere (mA) is one-thousandth of an ampere (1 mA = 0.001 A). It’s used to measure smaller currents, such as those in portable devices, sensors, or battery-powered systems. The prefix “milli” denotes a factor of 1/1000, making milliamps ideal for precision measurements without dealing with tiny decimal values.

How Many Milliamps are in an Amp

One ampere (A) is equal to 1000 milliamps (mA). This 1:1000 ratio is the key to converting between these units. For instance, a device using 1 A of current is drawing 1000 mA, while a current of 250 mA equals 0.25 A.

How to Convert mA to A

Converting milliamps (mA) to amps (A) is simple because 1 ampere equals 1000 milliamps. To convert, divide the milliamp value by 1000. For example, if a device draws 4500 mA, divide 4500 by 1000 to get 4.5 A.

How to Convert A to mA

Converting amps (A) to milliamps (mA) is equally straightforward. Since 1 A equals 1000 mA, multiply the amp value by 1000. For instance, if a circuit uses 3.2 A, multiply 3.2 by 1000 to get 3200 mA.

Milliamps (mA)	Amps (A)
100 mA	0.1 A
200 mA	0.2 A
500 mA	0.5 A
1000 mA	1.0 A
1500 mA	1.5 A
2000 mA	2.0 A
3000 mA	3.0 A
5000 mA	5.0 A

What’s the Difference Between Ah and Wh?

You may have come across Ah (amp-hours) and Wh (watt-hours) as units. Wh represents the energy stored in a battery, indicating its total power output, while Ah measures the battery’s charge capacity, often used to describe its runtime. The two are linked through voltage (V) with the formula:

Ah = Wh ÷ V

Wh = Watt-hours (energy)
V = Volts (voltage)
Ah = Amp-hours (capacity)

For example, the Ampace Andes 1500 battery offers 1462 Wh of energy capacity. We usually express the battery capacity of a product in Wh or kWh, so you can understand the battery's lifespan based on the wattage used per hour. Here are conversion examples to Ah:

At 12V (common for car batteries):
Ah = 1462 Wh ÷ 12 V ≈ 121.83 Ah
At 3.7V (common for lithium batteries, like in phones):
Ah = 1462 Wh ÷ 3.7 V ≈ 395.14 Ah

These conversions help you understand battery performance and choose the right equipment for better energy efficiency.

Ampace Portable Power Station Explained

Ah and Wh are units for measuring battery capacity. If you need to choose a portable power station, please pay attention to these values. Ampace focuses on advanced lithium-ion battery business, offering portable power stations, solar generators, and portable solar panels, providing high-capacity energy solutions. These products ensure the needs of outdoor exploration, emergency backup and sustainable energy.

Ampace Andes 1500 : with its 1462Wh capacity and 2400W output (Surge 3600W), is perfect for high-power demands, such as powering household appliances during outages or supporting off-grid living.

Ampace Andes 600 Pro : strikes a balance between power and portability, offering a 584Wh LiFePO4 hybrid battery and 600W output (Surge 1800W), ideal for camping, outdoor adventures, and emergency backup.

Ampace Andes 300 : weighing just 3.72kg (8.2 lbs) with a 266Wh capacity and 300W output, is designed for lightweight portability, making it great for charging phones and laptops during camping or short power outages.