Depreciation can be calculated by various methods but the most preferred method is the straight-line method. The calculation of depreciation under this method is as follows:
The determination of the total amount to depreciate can be made from subtracting the salvage value from the cost of the asset.
The amount is divided by the useful life in years of the asset.
The depreciation amount can be further divided by 12 months to determine the cost of depreciation to be charged monthly.