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Coulombs to Ampere-hours Converter

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

C

Ampere-hours

1.5

Ah

5400 C = 1.5 Ah

Ah = C ÷ 3600

Coulombs to Ampere-hours: 1 C equals 0.000278 Ah. To convert coulombs to ampere-hours, multiply by 0.000278 (Ah = C ÷ 3600). For example, 10 C = 0.002778 Ah.

How to Convert Coulombs to Ampere-hours

To convert from coulombs to ampere-hours, multiply the value by 0.000278. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

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

Coulombs to Ampere-hours Conversion Chart

Coulombs (C)Ampere-hours (Ah)
0.12.77778e-5
0.256.94444e-5
0.50.000139
10.000278
20.000556
30.000833
50.001389
100.002778
200.005556
250.006944
500.013889
1000.027778
2500.069444
10000.277778

Understanding the Units

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.

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.

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FAQ

How do I convert coulombs to ampere-hours?

Divide the charge in coulombs by 3,600. For example, 5,400 C ÷ 3,600 = 1.5 Ah.

Why divide by 3,600?

One hour contains 3,600 seconds. Since one coulomb equals one ampere-second, dividing by 3,600 converts ampere-seconds to ampere-hours.

When would I convert coulombs to ampere-hours?

This conversion is useful when calculating battery capacity from charge measurements, or when converting physics calculations (in coulombs) to practical battery units.

What is the coulomb in everyday terms?

One coulomb is about the charge in a small camera flash capacitor. A typical smartphone battery holds roughly 10,000-15,000 coulombs (about 3-4 Ah).

How many ampere-hours are in 1 coulomb?

1 C equals 0.000278 Ah.

How do you convert coulombs to ampere-hours?

Multiply the coulomb value by 0.000278. Formula: Ah = C ÷ 3600.

How many ampere-hours are in 5 coulombs?

5 C = 0.001389 Ah.

How do you convert ampere-hours back to coulombs?

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

What is the difference between Coulomb and Ampere-hour?

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