Coulomb to Ampere-hour Converter
Convert coulombs to ampere-hours (C to Ah) instantly with this free online electric-charge converter. Enter any value in the Coulomb field and get the equivalent in Ampere-hour immediately. This converter handles any quantity — from tiny fractions to large numbers — with full precision. No signup, no ads in the widget, and the conversion runs entirely in your browser for instant results.
The conversion factor is exact: 1 C = 0.0002777777778 Ah. To convert coulombs to ampere-hours, multiply your Coulomb value by 0.0002777777778. For example, 10 C = 0.002777777778 Ah. You can also reverse the calculation: 1 Ah = 3600 C.
Quick conversion table
| Coulomb (C) | Ampere-hour (Ah) |
|---|---|
| 1 C | 0.0002777777778 Ah |
| 5 C | 0.001388888889 Ah |
| 10 C | 0.002777777778 Ah |
| 25 C | 0.006944444444 Ah |
| 50 C | 0.01388888889 Ah |
| 100 C | 0.02777777778 Ah |
Use the swap button to reverse the direction, or choose a different unit from the dropdown menus to convert within the electric-charge category.
Formula
Coulomb to Ampere-hour conversion: 1 C = 0.0002777777778 Ah ampere-hours = coulombs × 0.0002777777778 1 Ah = 3600 C coulombs = ampere-hours × 3600
Example
Example: Convert 10 C to Ah: 10 C × 0.0002777777778 = 0.002777777778 Ah So, 10 C is about 0.002777777778 Ah. To convert back, multiply by 3600: 0.002777777778 Ah × 3600 = 10 C.
How to Use
- Enter the value you want to convert in the Coulomb field
- The result in Ampere-hour appears instantly below
- Use the dropdown menus to change units if needed
- Click 'Swap Units' to reverse the conversion direction
- Copy the result or adjust the input for a new conversion
Frequently Asked Questions
How do I convert coulombs to ampere-hours?
Enter the value in Coulomb (C) in the 'From' field. The equivalent in Ampere-hour (Ah) appears instantly in the 'To' field. The converter uses precise conversion factors and updates in real time as you type.
What is the formula to convert C to Ah?
1 C = 0.0002777777778 Ah, so ampere-hours = coulombs × 0.0002777777778. To convert back, 1 Ah = 3600 C. The full formula and a worked example are shown on this page.
How many ampere-hours are in one Coulomb?
1 C = 0.0002777777778 Ah.
Is this Coulomb to Ampere-hour converter free?
Yes, completely free with no signup, no limits, and no ads in the converter widget. You can convert as many values as you need. The tool runs entirely in your browser, so your data never leaves your device.
Can I convert ampere-hours back to coulombs?
Yes. Click the 'Swap Units' button to reverse the direction. You can also use the dropdown menus to select any other electric-charge unit for either field.
How accurate is the C to Ah conversion?
The converter uses high-precision conversion factors (up to 8 decimal places). Results are displayed with up to 6 decimal places, with trailing zeros removed for readability. For scientific or engineering work, always verify with official standards.