Operating costs are expenses associated with maintaining and running a business on a daily basis. They include costs like administration, maintenance, repairs and wages. Operating costs are classified as fixed, variable or semi-variable. Fixed costs remain constant regardless of the level of production or sales like depreciation. Variable costs change in relation to activity like materials. Semi-variable costs have both fixed and variable elements like insurance. Operating costing is used to calculate the costs of providing services and is applied by organizations like transport, utilities and hospitals. It involves classifying and collecting costs to determine a cost per unit of service.