Note: appliances with cooling or heating will only be on a percentage of the time, probably 50%. so you can halve the cost or the time.
VA is not Watts(W).

W=Volts(V)*Amps(A).

VA=rmsVolts*rmsAmps / PF=W / PF, where PF is power factor. PF=VA/W. When measuring my computer, PF was 0.68. see article.

120V x number of Amps of appliance = WATTS (W)

So if you have a 7A coffee pot, it would be 120Vx7A=840W, or 900W (7.5A) for a toaster for example.

A Dell Dimension 4600 computer (250W PSU), monitor and ink jet printer, which is on 1/3 of the day, comes out to $49/mo. all of it consumes ~285VA (~2.49A). The monitor and the printer are on all the time, even in sleep mode.

feed it into your calculator one of 2 ways:

$permonth = (W x HoursOn x 31days x $0.0736perkWH)/1000
or
$permonth = (VA/PF x HoursOn x 31days x $0.0736perkWH)/1000 = (VA/0.68 x HoursOn x 31days x $0.0736perkWH)/1000
or
$permonth = (Volts x Amps x HoursOn x 31days x $0.0736perkWH)/1000

see article on the equation.

most plug-in appliances run on 120V (120VAC). clothes dryers & stoves: check your circuit breaker & multiply by 220V. your washer & fridge probably run on 120V 15-20A (check your breaker or back of fridge).

remember, this is worst-case cost.

found the equation on the PUD web site (cool!).

There is also the P3 International P4460 Electricity Usage Monitor (called the Kill-A-Watt meter) for $40