One ampere is exactly 1,000,000,000 nanoamps, so converting amperes to nanoamps 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.
The ampere is the SI base unit of electric current, defined since 2019 by fixing the elementary charge at 1.602176634 x 10^-19 coulombs. One nano ampere is one billionth of a ampere (1e-9 amperes).
Two tables follow: rounded steps for quick lookup, and a set of real reference quantities converted into nanoamps, which is usually more useful than the bare number.
The formula
amperes- The amount you are converting, in amperes
1,000,000,000- The exact number of nanoamps in one ampere
nanoamps- The converted result
How it works, step by step
- Enter the value in amperes.
- It is multiplied by 1,000,000,000, the exact factor between the two units.
- The answer is shown in nanoamps, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
MIG welder at full output: 250 A in nanoamps
At 250 A (mig welder at full output), the same quantity in nanoamps is 250 × 1e+09 = 2.5e+11 nA. One ampere is 1e+09 nanoamps, so the numbers grow as expected.
Car starter motor: 300 A in nanoamps
At 300 A (car starter motor), the same quantity in nanoamps is 300 × 1e+09 = 3e+11 nA. One ampere is 1e+09 nanoamps, so the numbers grow as expected.
How to read your score
Frequently asked questions
How many nanoamps are in one ampere?
Exactly 1,000,000,000. 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 amperes to nanoamps?
nanoamps = amperes × 1,000,000,000. Reversed, amperes = nanoamps ÷ 1,000,000,000, which is the same as multiplying by 1e-09.
Which is the bigger unit, the ampere or the nanoamp?
The ampere. One ampere equals 1e+09 nanoamps.
What does this quantity actually measure?
Both units measure how much charge flows past a point each second. 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 ampere?
The ampere is the SI base unit of electric current, defined since 2019 by fixing the elementary charge at 1.602176634 x 10^-19 coulombs.
What is a nanoamp?
One nano ampere is one billionth of a ampere (1e-9 amperes).
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.
Amperes to nanoamps reference tables
| Amperes | Nanoamps |
|---|---|
| 0.5 A | 5e+08 nA |
| 1 A | 1e+09 nA |
| 2 A | 2e+09 nA |
| 3 A | 3e+09 nA |
| 5 A | 5e+09 nA |
| 10 A | 1e+10 nA |
| 20 A | 2e+10 nA |
| 25 A | 2.5e+10 nA |
| 50 A | 5e+10 nA |
| 75 A | 7.5e+10 nA |
| 100 A | 1e+11 nA |
| 250 A | 2.5e+11 nA |
| 500 A | 5e+11 nA |
| 1000 A | 1e+12 nA |
| 5000 A | 5e+12 nA |
Exact factor: 1 ampere = 1,000,000,000 nanoamps.
| Quantity | A | nA |
|---|---|---|
| LED indicator | 0.02 A | 2e+07 nA |
| Phone fast charger | 3 A | 3e+09 nA |
| Domestic ring-main fuse (UK) | 32 A | 3.2e+10 nA |
| Car starter motor | 300 A | 3e+11 nA |
| MIG welder at full output | 250 A | 2.5e+11 nA |
| Microcontroller sleep mode | 5e-06 A | 5000 nA |
Published reference values, converted with the same factor this page uses.