Book value is a measure of the current worth of a company that doesn’t factor in future growth. It is a figure of what the company is worth if they sold all of its assets and paid its debts.

Written-down value is the value of an asset after accounting for depreciation or amortization. It is also called book value or net book value.

To calculate the depreciation value using the straight-line basis, or straight-line method (SLN), Excel uses a built-in function, SLN, which takes the arguments: cost, salvage, and life.

Depreciated cost is the original cost of a fixed asset less accumulated depreciation; this is the net book value of the asset.