Does my data get uploaded anywhere?
No. Everything runs locally in your browser and nothing is sent to a server.
Is this free to use?
Yes. It is completely free, with no account, no signup, and no usage limits.
Does it work on a phone?
Yes. The page runs in any modern mobile browser, on iPhone and Android alike, with no app to install.
Is 5,000 mAh the same as 5,000 mA?
No, and this is the single most common confusion in battery specs. mA is current, a rate of flow. mAh is charge, an amount, equal to a current of 1 mA sustained for one hour. A 5,000 mAh battery can deliver 5,000 mA for one hour, or 500 mA for ten hours.
How many amps is 500 mA?
0.5 A. That is the standard USB 2.0 port budget, which is why a device that wants more has to negotiate for it. USB 3.0 raises it to 900 mA (0.9 A), and USB-C PD can go to 5 A.
What does the kA rating on a breaker mean?
It is the interrupting rating, the maximum fault current the breaker can safely break. A 10 kA rating is 10,000 A, which is far above the breaker's trip current (perhaps 16 A) and describes what happens during a short circuit rather than in normal use.
How do I get watts from amps?
You need the voltage as well: watts equal volts times amps, for DC or for AC at unity power factor. So 0.5 A at 5 V is 2.5 W. This page converts current units only, so bring the voltage yourself.
Why do sub-microamp values print as 5.000000e-7?
The display switches to exponential notation below one millionth of the base unit, which for current is the ampere. So 0.5 microamps, which is 0.0000005 A, is printed as 5.000000e-7 A. The value is exact, only the formatting changes.