# Is next formula to calculate TX cost in euros correct?

I want to create a transaction in the main-net. Each transaction modifies 4 * 32 bytes of storage. It also creates a event with 3 indexes and 150 bytes of real log.

Note: I arbitrarily take 300 Euros/Eth.

The calculus made follows:

``````Cost in gas calculus:
Cost  TX      :    21000 gas/TX      * 1TX        = 21000
Cost storage  :    20000 gas/32bytes * 4*32 bytes = 80000
Cost   event  :      375 gas/LOG     * 1LOG       =   375
Cost   Topic  :      375 gas/topic   * 3topic     =  1125
Cost  byte/log:        8 gas/byte    * 150 bytes  =  1240
-------
TOTAL    103740 gas
gas to Euro calculus:
103740 (TOTAL) gas * 0.000000032 Eth/gas * 300 Euros/Eth = 0.995904 Eu
``````

The 0.000000032 Eth/gas is taken from the average gas price at http://ethgasstation.info/

The final price, 0.996Eu, looks extremely costly, so I'm thinking there is a mistake in my calculus or something else that scapes to my understanding.

I base my calculus/data in next references: