To convert faradays to milliamp-hours, multiply by 26,801.48114. That factor is the whole relationship: both units measure the total quantity of electricity, including battery capacity, so the conversion is a proportion with no offset and no substance-specific constant.
One faraday is the charge on a mole of electrons, the constant that sets how much metal an electroplating bath deposits per amp-hour. The milliamp-hour is how every phone, laptop and power-bank battery is rated. One mAh is 3.6 coulombs, because an hour is 3,600 seconds.
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. Two tables follow: rounded steps for quick lookup, and a set of real reference quantities converted into milliamp-hours, which is usually more useful than the bare number.
The formula
faradays- The amount you are converting, in faradays
26,801.4811444- The exact number of milliamp-hours in one faraday
milliamp-hours- The converted result
How it works, step by step
- Enter the value in faradays.
- It is multiplied by 26,801.4811444, the exact factor between the two units.
- The answer is shown in milliamp-hours, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
Phone battery, 4000 mAh: 0.149 F in milliamp-hours
At 0.149 F (phone battery, 4000 mah), the same quantity in milliamp-hours is 0.149 × 26,801.5 = 3993.42 mAh. One faraday is 26,801.5 milliamp-hours, so the numbers grow as expected.
Laptop battery, 60 Wh at 11.1 V: 0.202 F in milliamp-hours
Laptop battery, 60 Wh at 11.1 V comes to about 0.202 F. Multiplying by the factor: 0.202 × 26,801.5 = 5413.9 mAh. Dividing the answer back by 26,801.5 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
How to read your score
Frequently asked questions
How many milliamp-hours are in one faraday?
Exactly 26,801.4811444. 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 faradays to milliamp-hours?
milliamp-hours = faradays × 26,801.4811444. Reversed, faradays = milliamp-hours ÷ 26,801.4811444, which is the same as multiplying by 3.73113707638e-05.
Which is the bigger unit, the faraday or the milliamp-hour?
The faraday. One faraday equals 26,801.5 milliamp-hours.
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 faraday?
One faraday is the charge on a mole of electrons, the constant that sets how much metal an electroplating bath deposits per amp-hour.
What is a milliamp-hour?
The milliamp-hour is how every phone, laptop and power-bank battery is rated. One mAh is 3.6 coulombs, because an hour is 3,600 seconds.
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.
Is there a quick way to do F to mAh in my head?
Plenty of people do this in their head: multiply by 27,000 instead of using the exact factor 26,801.48114. At 100 that shortcut gives 2,700,000 milliamp-hours, off by 19851.885556 milliamp-hours or about 0.74%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Faradays to milliamp-hours reference tables
| Faradays | Milliamp-Hours |
|---|---|
| 0.5 F | 13,400.7 mAh |
| 1 F | 26,801.5 mAh |
| 2 F | 53,603 mAh |
| 3 F | 80,404.4 mAh |
| 5 F | 134,007 mAh |
| 10 F | 268,015 mAh |
| 20 F | 536,030 mAh |
| 25 F | 670,037 mAh |
| 50 F | 1.34007e+06 mAh |
| 75 F | 2.01011e+06 mAh |
| 100 F | 2.68015e+06 mAh |
| 250 F | 6.70037e+06 mAh |
| 500 F | 1.34007e+07 mAh |
| 1000 F | 2.68015e+07 mAh |
| 5000 F | 1.34007e+08 mAh |
Exact factor: 1 faraday = 26,801.4811444 milliamp-hours.
| Quantity | F | mAh |
|---|---|---|
| AA alkaline cell | 0.09328 F | 2500 mAh |
| Phone battery, 4000 mAh | 0.1492 F | 4000 mAh |
| Laptop battery, 60 Wh at 11.1 V | 0.2017 F | 5405 mAh |
| Car battery, 60 Ah | 2.239 F | 6e+04 mAh |
| Camera flash capacitor | 5.182e-07 F | 0.01389 mAh |
| Lightning strike | 0.0001555 F | 4.167 mAh |
Published reference values, converted with the same factor this page uses.