Coulombs to Ampere-Hours Conversion (C to Ah)

Coulombs to Ampere-Hours Converter

Enter the electric charge in coulombs below to convert it to ampere-hours.

Result in Ampere-Hours:

1 C = 0.000278 Ah

How to Convert Coulombs to Ampere-Hours

To convert a measurement in coulombs to a measurement in ampere-hours, divide the electric charge by the following conversion ratio: 3,600 coulombs/ampere-hour.

Since one ampere-hour is equal to 3,600 coulombs, you can use this simple formula to convert:

ampere-hours = coulombs ÷ 3,600

The electric charge in ampere-hours is equal to the electric charge in coulombs divided by 3,600.

For example, here's how to convert 5,000 coulombs to ampere-hours using the formula above.

ampere-hours = (5,000 C ÷ 3,600) = 1.388889 Ah

Coulombs and ampere-hours are both units used to measure electric charge. Keep reading to learn more about each unit of measure.

What Is a Coulomb?

One coulomb is the electric charge equal to one ampere of current over one second.^[1]

The coulomb can be expressed as Q_C = I_A × t_s

The charge in coulombs is equal to the current in amperes times the time in seconds.

The coulomb is the SI derived unit for electric charge in the metric system. Coulombs can be abbreviated as C; for example, 1 coulomb can be written as 1 C.

Learn more about coulombs.

What Is an Ampere-Hour?

One ampere-hour is the electric charge equal to the charge conveyed by a current of one ampere for one hour. One ampere-hour is equal to 3,600 coulombs.

The ampere-hour is a non-SI metric unit for electric charge. An ampere-hour is sometimes also referred to as an amp-hour. Ampere-hours are usually abbreviated as Ah, although the formally adopted expression is A·h. The abbreviation A h is also sometimes used. For example, 1 ampere-hour can be written as 1 Ah, 1 A·h, or 1 A h.

In formal expressions, the centered dot (·) or space is used to separate units used to indicate multiplication in an expression and to avoid conflicting prefixes being misinterpreted as a unit symbol.^[1]

Learn more about ampere-hours.

Coulomb to Ampere-Hour Conversion Table

Table showing various coulomb measurements converted to ampere-hours.
Coulombs	Ampere-hours
1 C	0.000278 Ah
2 C	0.000556 Ah
3 C	0.000833 Ah
4 C	0.001111 Ah
5 C	0.001389 Ah
6 C	0.001667 Ah
7 C	0.001944 Ah
8 C	0.002222 Ah
9 C	0.0025 Ah
10 C	0.002778 Ah
20 C	0.005556 Ah
30 C	0.008333 Ah
40 C	0.011111 Ah
50 C	0.013889 Ah
60 C	0.016667 Ah
70 C	0.019444 Ah
80 C	0.022222 Ah
90 C	0.025 Ah
100 C	0.027778 Ah
200 C	0.055556 Ah
300 C	0.083333 Ah
400 C	0.111111 Ah
500 C	0.138889 Ah
600 C	0.166667 Ah
700 C	0.194444 Ah
800 C	0.222222 Ah
900 C	0.25 Ah
1,000 C	0.277778 Ah
2,000 C	0.555556 Ah
3,000 C	0.833333 Ah
4,000 C	1.1111 Ah
5,000 C	1.3889 Ah
6,000 C	1.6667 Ah
7,000 C	1.9444 Ah
8,000 C	2.2222 Ah
9,000 C	2.5 Ah
10,000 C	2.7778 Ah

Table showing various coulomb measurements converted to ampere-hours.

Coulombs

Ampere-hours

1 C

0.000278 Ah

2 C

0.000556 Ah

3 C

0.000833 Ah

4 C

0.001111 Ah

5 C

0.001389 Ah

6 C

0.001667 Ah

7 C

0.001944 Ah

8 C

0.002222 Ah

9 C

0.0025 Ah

10 C

0.002778 Ah

20 C

0.005556 Ah

30 C

0.008333 Ah

40 C

0.011111 Ah

50 C

0.013889 Ah

60 C

0.016667 Ah

70 C

0.019444 Ah

80 C

0.022222 Ah

90 C

0.025 Ah

100 C

0.027778 Ah

200 C

0.055556 Ah

300 C

0.083333 Ah

400 C

0.111111 Ah

500 C

0.138889 Ah

600 C

0.166667 Ah

700 C

0.194444 Ah

800 C

0.222222 Ah

900 C

0.25 Ah

1,000 C

0.277778 Ah

2,000 C

0.555556 Ah

3,000 C

0.833333 Ah

4,000 C

1.1111 Ah

5,000 C

1.3889 Ah

6,000 C

1.6667 Ah

7,000 C

1.9444 Ah

8,000 C

2.2222 Ah

9,000 C

2.5 Ah

10,000 C

2.7778 Ah

References

International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf