To Calculate Straight Line Depreciation, Use the Following Formula:
$$\text { Annual Depreciation } = \frac { \text { Total Depreciation } } { \text { Estimated Useful Life (Years) } }$$

To calculate straight line depreciation, use the following formula:
? $$\text { Annual Depreciation } = \frac { \text { Total Depreciation } } { \text { Estimated Useful Life (Years) } }$$ ?