One faraday is exactly 96,485.33212 coulombs, so converting faradays to coulombs 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 faraday is the charge on a mole of electrons, the constant that sets how much metal an electroplating bath deposits per amp-hour. The coulomb is the SI unit of electric charge: one ampere flowing for one second.
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 coulombs so the number you get has something to be compared against.
The formula
faradays- The amount you are converting, in faradays
96,485.33212- The exact number of coulombs in one faraday
coulombs- The converted result
How it works, step by step
- Enter the value in faradays.
- It is multiplied by 96,485.33212, the exact factor between the two units.
- The answer is shown in coulombs, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
Lightning strike: 0.000155 F in coulombs
Take lightning strike, roughly 0.000155 F. The conversion is a single multiplication — 0.000155 × 96,485.3 — giving 14.9552 C. Because the relationship is proportional, doubling the input doubles the answer to 29.9105 C.
Laptop battery, 60 Wh at 11.1 V: 0.202 F in coulombs
Take laptop battery, 60 wh at 11.1 v, roughly 0.202 F. The conversion is a single multiplication — 0.202 × 96,485.3 — giving 19,490 C. Because the relationship is proportional, doubling the input doubles the answer to 38,980.1 C.
How to read your score
Frequently asked questions
How many coulombs are in one faraday?
Exactly 96,485.33212. 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 coulombs?
coulombs = faradays × 96,485.33212. Reversed, faradays = coulombs ÷ 96,485.33212, which is the same as multiplying by 1.03642696566e-05.
Which is the bigger unit, the faraday or the coulomb?
The faraday. One faraday equals 96,485.3 coulombs.
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 coulomb?
The coulomb is the SI unit of electric charge: one ampere flowing for one second.
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 C in my head?
Plenty of people do this in their head: multiply by 100,000 instead of using the exact factor 96,485.33212. At 100 that shortcut gives 10,000,000 coulombs, off by 351466.788000 coulombs or about 3.64%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Faradays to coulombs reference tables
| Faradays | Coulombs |
|---|---|
| 0.5 F | 48,242.7 C |
| 1 F | 96,485.3 C |
| 2 F | 192,971 C |
| 3 F | 289,456 C |
| 5 F | 482,427 C |
| 10 F | 964,853 C |
| 20 F | 1.92971e+06 C |
| 25 F | 2.41213e+06 C |
| 50 F | 4.82427e+06 C |
| 75 F | 7.2364e+06 C |
| 100 F | 9.64853e+06 C |
| 250 F | 2.41213e+07 C |
| 500 F | 4.82427e+07 C |
| 1000 F | 9.64853e+07 C |
| 5000 F | 4.82427e+08 C |
Exact factor: 1 faraday = 96,485.33212 coulombs.
| Quantity | F | C |
|---|---|---|
| AA alkaline cell | 0.09328 F | 9000 C |
| Phone battery, 4000 mAh | 0.1492 F | 1.44e+04 C |
| Laptop battery, 60 Wh at 11.1 V | 0.2017 F | 1.946e+04 C |
| Car battery, 60 Ah | 2.239 F | 2.16e+05 C |
| Camera flash capacitor | 5.182e-07 F | 0.05 C |
| Lightning strike | 0.0001555 F | 15 C |
Published reference values, converted with the same factor this page uses.