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Ampere-hours to Coulombs Converter

Convert ampere-hour to coulomb instantly. 1 Ah = 3600 C, worked steps and a full reference table.

Formula
C = Ah × 3600

How to use it

  • Type the value in ampere-hour — the result updates as you type.
  • Use Swap to flip the direction, or change either dropdown to convert between any two units.
  • Click the result to copy it. The URL updates too, so you can bookmark or share the exact conversion.

Examples

1 Ah3600 C
5 Ah18000 C
10 Ah36000 C
100 Ah360000 C

One ampere-hour equals 3600 coulombs (C). To convert ampere-hours to coulombs, multiply by 3600; to go back the other way, multiply by 0.00027777778 instead.

The converter above does it as you type and shows the working underneath, so you can check the arithmetic rather than take the number on trust.

What ampere-hours and coulombs actually measure

Ampere-hour (Ah) — An amp-hour is one amp sustained for an hour — 3,600 coulombs. Car and deep-cycle battery capacity.

Coulomb (C) — The coulomb is the SI unit of charge — one amp flowing for one second. Physics and electrical theory.

Ampere-hours to Coulombs conversion table

The most common values, worked out in advance. Anything not listed can be typed straight into the converter.

AhC
1 Ah3600 C
2 Ah7200 C
5 Ah18000 C
10 Ah36000 C
25 Ah90000 C
50 Ah180000 C
100 Ah360000 C

How to convert ampere-hours to coulombs by hand

Multiply the number of ampere-hours by 3600.

For example, 25 Ah × 3600 = 90000 C.

Going the other way, divide by 3600 — or multiply by 0.00027777778, which is the same thing and easier to do in your head.

Everything runs in your browser

There is no server involved in the calculation. The numbers you type never leave your device, nothing is logged, and the page keeps working with no connection once it has loaded. That is not a marketing line — it is simply how the tool is built, because a calculation like this has no reason to touch a network.

Questions people ask

How many C are in 1 Ah?

1 Ah equals exactly 3600 C. Multiply any value in ampere-hour by 3600 to get coulomb.

Is anything uploaded to a server?

No. The whole calculation happens in your browser. Nothing is sent anywhere, and the page keeps working offline once loaded.

Runs entirely in your browser. Nothing you type is uploaded, logged or shared.

Last updated 18 August 2026