How can I tell how many amps my Nissan Leaf 2017 is receiving at a charger?

[SageBrush]

To calculate watts produced or consumed-
volts * amps = watts

To calculate kilowatts produced or consumed-
volts * amps = (watts / 1000)

I know what you are trying to say here but you are better off starting from the balanced equation of
volts*amps/1000 = watts/1000 = kW

But if someone did for whatever reason what to yes the formula would be:
1000 * kW = watts

Start from a balanced equation:
watt = watt
1000* watt = 1000*watt
1000 = k, So
1000*watt = kW

[DaveinOlyWA]

Would I need to install Leaf Spy or something?

What us the maximum amperage I can take fill advantage of? And is there such a thing as an l2 charger too powerful to use? Or does it just automatically step down to what I can handle?

Like ALL electrical appliances, the device will draw only what it needs. This is how a 100 watt incandescent and a 7 watt LED survive on the same plug. LEAF Spy does tell you power, current and voltage ALL the time including when charging. Realize the input is slightly higher than displayed because LEAF spy only shows the sum total of power so you have overhead taking a bit. L2 charging has cooling requirements, etc. So a 6.6 kw input, you would see 6.2 to as much as 6.5 kw

FYI; you will find most public L2's incapable of making your LEAF sweat.

[DaveinOlyWA]

Leaf Spy Lite (free for Android) or Leaf Spy Pro will indeed tell you how many amps are going into the battery via displaying a negative number. Negative number equals amps going into battery, positive equals amps coming out. Remember this is the amps going into the battery. If you are sitting in the car while charging and also running other things like heat or air con, you'll end up with less amps going into the battery.

volts (battery pack volts) * amps = watts
watts \ 1000 = kW (or kWh)

At a L2 6.6kWh charger you should see 15-16 amps going into your battery depending upon other active power loads.
At a DC 50kWh charger you should see a range between 100 - 125 amps going into your battery.

Thanks for making the effort to get units right. It helps a LOT. A few typos though:

1000* watt = kW
Chargers and EVSEs provide power, thus kW.
Over a charging session, power * time = kWh (energy)