Coulomb to Ampere Hour

Convert coulomb to ampere hour instantly. Type in either field — results update live.

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charge Coulomb Ampere Hour

1 coulomb = 0.00027777777778 ampere hours

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Format

Selected C values converted to Ah using the exact factor from this tool.

Exact conversion factors in both directions, plus a worked example.

1 C = 0.0002777778 Ah

1 Ah = 3600 C

To convert coulomb to ampere hour, multiply by 0.0002777778.

To convert ampere hour to coulomb, multiply by 3600.

Example: convert 10 C to Ah

10 × 0.0002777778 = 0.0027777778 Ah

Short background on the units used in this conversion.

The coulomb (C) is the SI unit of electric charge — one ampere of current for one second (A·s).

Coulombs quantify capacitor charge, electrostatic charge transfer, and total charge moved in a circuit over time.

The ampere-hour (Ah) equals 3,600 coulombs — the standard battery-capacity unit. Milliampere-hours convert as mAh × 3.6 = coulomb.

Ampere-hours label phone batteries, EV packs, and any storage rated by how much current they deliver over time.

How many ampere hours are in one coulomb?

One coulomb equals 0.00027777777778 ampere hours. Multiply your coulombs value by 0.00027777777778 to convert to ampere hours.

What is the conversion formula?

Ah = C × 0.00027777777778

The reverse is C = Ah × 3,600, using the same exact factors as this converter.

Is this Coulomb to Ampere Hour converter private?

Yes. All calculations run locally in your browser. Nothing you type is sent to a server.