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Charge Converter

Convert electric charge: coulomb, ampere-hour, faraday.

7 units
6 decimals

1 C = 0.000278 Ah

About the charge converter

Electric charge is the fundamental quantity of electricity, measured in coulombs (C) in SI — one coulomb is the charge transported by a current of one ampere flowing for one second. Battery capacity is usually quoted in ampere-hours (Ah) or milliampere-hours (mAh), which are also units of charge: 1 Ah = 3,600 C. Electrochemists work in faradays (≈96,485 C, the charge of one mole of electrons), and CGS-era physics still references the statcoulomb. Use this tool to translate between scientific, electronic, and battery-industry units of charge.

Frequently asked questions

  • How many coulombs are in 1 ampere-hour?

    Exactly 3,600 coulombs. A 5,000 mAh phone battery therefore stores 5 × 3,600 = 18,000 C of charge.

  • What is a faraday in this context?

    A faraday equals 96,485.33 C, the charge of one mole of elementary charges. Electroplating and electrolysis calculations are typically done in faradays.

  • How is mAh related to energy in watt-hours?

    mAh alone is not energy — you also need voltage. Multiply mAh × nominal voltage ÷ 1,000 to get Wh. A 3,000 mAh, 3.7 V cell stores about 11.1 Wh.

More electricity converters

Linear Charge Density → Surface Charge Density → Volume Charge Density → Current → Linear Current Density → Surface Current Density → Electric Field Strength → Electric Potential →

Complete list of charge units