One millicoulomb is exactly 2.777777778e-07 amp-hours, so converting millicoulombs to amp-hours is a single multiplication. Enter any figure and the result appears as you type — the arithmetic runs in your browser, so nothing is sent anywhere.
One milli coulomb is one thousandth of a coulomb (1e-3 coulombs). Amp-hours rate car, leisure and solar batteries. A 100 Ah battery can in principle deliver one amp for a hundred hours.
Milliamp-hours are charge, not energy. Two batteries both rated 3,000 mAh store different amounts of energy if their voltages differ, which is why power banks advertise mAh at cell voltage and deliver less at USB voltage. Below the calculator there is a step table for the values people look up most, and a second table putting real the total quantity of electricity, including battery capacity figures into amp-hours so the number you get has something to be compared against.
The formula
millicoulombs- The amount you are converting, in millicoulombs
2.77777777778e-07- The exact number of amp-hours in one millicoulomb
amp-hours- The converted result
How it works, step by step
- Enter the value in millicoulombs.
- It is multiplied by 2.77777777778e-07, the exact factor between the two units.
- The answer is shown in amp-hours, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
Camera flash capacitor: 50 mC in amp-hours
Camera flash capacitor comes to about 50 mC. Multiplying by the factor: 50 × 2.77778e-07 = 1.38889e-05 Ah. Dividing the answer back by 2.77778e-07 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
Lightning strike: 1.5e+04 mC in amp-hours
Take lightning strike, roughly 1.5e+04 mC. The conversion is a single multiplication — 1.5e+04 × 2.77778e-07 — giving 0.00416667 Ah. Because the relationship is proportional, doubling the input doubles the answer to 0.00833333 Ah.
How to read your score
Frequently asked questions
How many amp-hours are in one millicoulomb?
Exactly 2.77777777778e-07. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.
What is the formula to convert millicoulombs to amp-hours?
amp-hours = millicoulombs × 2.77777777778e-07. Reversed, millicoulombs = amp-hours ÷ 2.77777777778e-07, which is the same as multiplying by 3,600,000.
Which is the bigger unit, the millicoulomb or the amp-hour?
The amp-hour. One millicoulomb is only 2.77778e-07 of a amp-hour, so it takes 3.6e+06 millicoulombs to make one amp-hour.
What does this quantity actually measure?
Both units measure the total quantity of electricity, including battery capacity. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.
What is a millicoulomb?
One milli coulomb is one thousandth of a coulomb (1e-3 coulombs).
What is a amp-hour?
Amp-hours rate car, leisure and solar batteries. A 100 Ah battery can in principle deliver one amp for a hundred hours.
Why does my answer differ from another converter?
Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.
Millicoulombs to amp-hours reference tables
| Millicoulombs | Amp-Hours |
|---|---|
| 0.5 mC | 1.38889e-07 Ah |
| 1 mC | 2.77778e-07 Ah |
| 2 mC | 5.55556e-07 Ah |
| 3 mC | 8.33333e-07 Ah |
| 5 mC | 1.38889e-06 Ah |
| 10 mC | 2.77778e-06 Ah |
| 20 mC | 5.55556e-06 Ah |
| 25 mC | 6.94444e-06 Ah |
| 50 mC | 1.38889e-05 Ah |
| 75 mC | 2.08333e-05 Ah |
| 100 mC | 2.77778e-05 Ah |
| 250 mC | 6.94444e-05 Ah |
| 500 mC | 0.000138889 Ah |
| 1000 mC | 0.000277778 Ah |
| 5000 mC | 0.00138889 Ah |
Exact factor: 1 millicoulomb = 2.77777777778e-07 amp-hours.
| Quantity | mC | Ah |
|---|---|---|
| AA alkaline cell | 9e+06 mC | 2.5 Ah |
| Phone battery, 4000 mAh | 1.44e+07 mC | 4 Ah |
| Laptop battery, 60 Wh at 11.1 V | 1.946e+07 mC | 5.405 Ah |
| Car battery, 60 Ah | 2.16e+08 mC | 60 Ah |
| Camera flash capacitor | 50 mC | 1.389e-05 Ah |
| Lightning strike | 1.5e+04 mC | 0.004167 Ah |
Published reference values, converted with the same factor this page uses.