How is depreciation calculated - Straight Line

How is depreciation calculated when using a depreciation method of Straight Line?

Capital Assets

Informational

1. Remaining Depreciation principal = Current book value - Estimated salvage value
2. Remaining periods of depreciation = (Useful life * 12) - Periods taken
3. Per period amount of depreciation = Remaining depreciation principal from step 1 / Remaining periods of depreciation from step 2
4. Total depreciation = Number of periods depreciation will be taken for * Per period amount of depreciation from from step 3

Refer to Master Article - How is depreciation calculated for calculations for other depreciation methods/bases