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  • How to calculate AC unit electric consumption?

and maybe how to force it to stay in a certain range?
p=ui, p is power u is voltage, i is current in amps
an 80 watts lamp would accumulate an i=p/u=80/220 thats less than 0.5 amps current.
You mean current value right?
Otherwise wattage would be p.t which is for example 80wattsx1hour thats 80 watt an hour.
I'm not sure what you mean by keeping it in a range, every electric unit has it's own power, theorically to decrease i, you could use higher voltage but it is not safe. What do you want precisely?
It should be written on the AC. There are 4 ratings you should keep in mind. The Peak Heating/Cooling and the Regular Heating/Cooling.

Modt of the times they are represented in amps. A small AC that consumes 4 amps may need 7 amps to first start.

That's why most ACs don't run on a 5 amp ishtirak because the breaker trips.

Watts= VoltageƗAmps

You can check your mains voltage using a cheap voltmeter and theoretically calculate how many watts you're using.

If you are really picky about it, you may want to invest in a good quality multimeter that can handle 20+ amps of current. You can hook it up to the AC outlet and monitor exactly how much it is using.
Don't use a series ammeter otherwise you risk frying.
Maybe the Ring shaped multimeter.