On average, washing machines tend to use around 0.5 to 1.5 kWh per load, and costs can range anywhere between 15 to 45c per load within this range.
The amount of electricity that a washing machine uses will depend on the model and cycle you use most often. However, in general, front-load washers tend to be more energy-efficient than their top-load counterparts, using less water and needing less energy on spin mode. Newer models are also much more energy-conscious, so do your research to ensure you're making the best long-term investment.