Looking at energy costs, a washing machine uses an average of 0.5 kWh per wash. That is equivalent to about 0.12 euros. The cost of water is around 0.07 euros per wash. So you end up with an average of 0.19 euros per wash. How much you exactly spend per wash depends on a number of factors. Not every washing machine and every laundry program uses the same amount of energy and/or water. In addition, the current energy and water prices also play a role. Finally, what you can also count on are the costs for your detergent and any fabric softener.