Unit Conversion

Convert numbers between two units quickly and precisely

Charge Converter

Unit Conversion

Convert charge units: coulomb, ampere-hour, and milliampere-hour

Electrical charge is measured in coulomb (C), the SI unit. For battery capacities, ampere-hour (Ah) and, especially for smaller devices, milliampere-hour (mAh) are more common, supplemented by millicoulomb (mC) and microcoulomb (µC) for small amounts of charge.

Key conversion factors:

  • 1 ampere-hour (Ah) = 3,600 coulomb (C)
  • 1 milliampere-hour (mAh) = 3.6 coulomb
  • 1 coulomb (C) = 1,000 millicoulomb (mC) = 1,000,000 microcoulomb (µC)

Applications:

  • Battery technology: capacity ratings of smartphones, laptops, and electric vehicles in mAh and Ah
  • Physics: elementary charge and charge amounts of individual particles in coulomb
  • Electrolysis: calculating the amount of charge needed for chemical reactions

The charge converter supports comparing battery capacities and electrochemical calculations.

Frequently asked questions about converting charge

1 ampere-hour (Ah) equals 3,600 coulomb (C), since 1 ampere flows for 1 hour (3,600 seconds): Q = I * t. Battery capacities are usually given in Ah or mAh, while physical charge is given in coulomb.

The milliampere-hour figure (mAh) describes how much charge the battery can store. A 4,000 mAh battery can theoretically supply 4,000 mA (4 A) for one hour, or correspondingly longer at lower current draw.

1 milliampere-hour (mAh) equals 3.6 coulomb. For a 4,000 mAh battery, that's 4,000 * 3.6 = 14,400 coulomb of stored charge.