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Ampere-hours to Coulombs Converter

Convert ampere-hours to coulombs and coulombs to ampere-hours instantly. Bidirectional charge converter with formula and common values.

Ah

Coulombs

9,000

C

2.5 Ah = 9,000 C

C = Ah × 3600

Ampere-hours to Coulombs: 1 Ah equals 3600 C. To convert ampere-hours to coulombs, multiply by 3600 (C = Ah × 3600). For example, 10 Ah = 36000 C.

How to Convert Ampere-hours to Coulombs

To convert from ampere-hours to coulombs, multiply the value by 3600. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Ampere-hours to Coulombs: C = Ah × 3600
  • Coulombs to Ampere-hours: Ah = C ÷ 3600

Ampere-hours to Coulombs Conversion Chart

Ampere-hours (Ah)Coulombs (C)
0.1360
0.25900
0.51800
13600
27200
310800
518000
1036000
2072000
2590000
50180000
100360000
250900000
10003600000

Understanding the Units

What is an Ampere-hour?

An ampere-hour equals exactly 3,600 coulombs — a current of one ampere flowing for one hour. It is the standard battery-capacity rating.

Common contexts: battery capacity, power tools, EV.

What is a Coulomb?

The coulomb is the SI derived unit of electric charge, equal to the charge transported by one ampere in one second (1 C = 1 A·s).

Named after Charles-Augustin de Coulomb (1736–1806), French physicist who quantified the electric force law.

Common contexts: electrostatics, chemistry.

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FAQ

How many coulombs are in one ampere-hour?

One ampere-hour equals 3,600 coulombs. This comes from 1 A × 3,600 seconds (one hour).

How do I convert ampere-hours to coulombs?

Multiply the charge in ampere-hours by 3,600. For example, 2.5 Ah × 3,600 = 9,000 C.

Why are ampere-hours used instead of coulombs?

Ampere-hours are more practical for battery capacity. A 2.5 Ah battery can deliver 2.5 amperes for one hour, which is easier to understand than 9,000 coulombs.

What is the relationship between Ah and Wh?

Watt-hours equal ampere-hours multiplied by voltage (Wh = Ah × V). A 3.7 V battery rated at 2.5 Ah stores 9.25 Wh of energy.

Is an ampere-hour an SI unit?

No. The ampere-hour is a practical unit accepted for use with SI. The official SI unit of charge is the coulomb.

How many coulombs are in 1 ampere-hour?

1 Ah equals 3600 C.

How do you convert ampere-hours to coulombs?

Multiply the ampere-hour value by 3600. Formula: C = Ah × 3600.

How many coulombs are in 5 ampere-hours?

5 Ah = 18000 C.

How do you convert coulombs back to ampere-hours?

Use the inverse formula: Ah = C ÷ 3600. For example, 1 C = 0.000278 Ah.

What is the difference between Ampere-hour and Coulomb?

An ampere-hour equals exactly 3,600 coulombs — a current of one ampere flowing for one hour. It is the standard battery-capacity rating. The coulomb is the SI derived unit of electric charge, equal to the charge transported by one ampere in one second (1 C = 1 A·s).