Electric Charge Converter

Multiply mAh by 3.6 to get coulombs. A typical smartphone battery rated at 5,000 mAh holds 18,000 coulombs of charge. One coulomb equals one ampere flowing for one second.

A Tesla Model 3 Long Range has about a 75 kWh battery pack at roughly 350V, which is approximately 214 Ah or 770,400 coulombs. For comparison, a standard AA battery holds about 2.5 Ah (9,000 C).

Milliamp hours (mAh) and amp hours (Ah) measure the same thing at different scales - 1 Ah equals 1,000 mAh. Small batteries like phone cells use mAh (3,000-5,000 mAh), while car batteries use Ah (40-100 Ah). Both represent charge over time.

One amp hour equals exactly 3,600 coulombs. This comes from the definition: 1 A × 3,600 seconds (1 hour) = 3,600 C. A microcoulomb (µC) is one millionth of a coulomb, used in electrostatics and sensor applications.

Battery manufacturers use mAh because it directly relates to how long a device will run - a 3,000 mAh battery can supply 300 mA for 10 hours. Coulombs are the SI standard used in physics and engineering calculations but are less intuitive for consumer products.