Multiply BTC/kB by 100,000 = sats/Byte
Divide sats/Byte by 100,000 = BTC/kB
B = Byte
kB = kilo-Byte (which in Bitcoins = 1,000 Bytes)
easiest for fast confirm is set Electrum to "Dynamic Fees" (Tools -> Preferences -> Fees) and move fee slider all the way to the right.
If calculating manually (Not recommended as it can be easy to make a mistake and pay too low fee) then goto
www.bitcoinfees.21.co and check for recommended fee. Multiply sats/byte fee by transaction size (click preview in Electrum)... that is the total fee to use.