What is straight-line depreciation?

Straight-line depreciation spreads the cost of an asset evenly over its useful life. Each year the same amount is deducted: (Cost − Salvage Value) ÷ Useful Life.

What is double declining balance depreciation?

Double declining balance (DDB) applies twice the straight-line rate to the beginning book value each year, resulting in higher depreciation in the early years. The rate is 2 ÷ Useful Life.

What is salvage value?

Salvage value (also called residual value) is the estimated worth of an asset at the end of its useful life. Depreciation is only calculated on the depreciable amount: Cost minus Salvage Value.

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Depreciation Calculator

Calculate asset depreciation with straight-line, declining balance (1×, 1.5×, 2× double), or sum-of-years-digits. Get a full year-by-year schedule with book values and CSV export.

Asset Details

Asset Name

Purchase Cost

Salvage Value

Useful Life

yrs

Purchase Date

Depreciation Method

Rate Multiplier

Display Options

Currency

Pro-rata first year (based on purchase date)

Year 1 Depreciation

—

Year 1

Total Depreciation —

SL Equivalent / year —

Accumulated after 5 yrs —

Book value after 5 yrs —

Book Value Over Time

Accumulated Depreciation

Remaining Book Value

Full Schedule

Year	Opening	Depreciation	Accumulated	Closing

How to use

Enter the asset's purchase cost, estimated salvage value at end of life, and its useful life in years.
Pick a method — straight-line for even wear, declining balance for fast-depreciating tech/vehicles, SYD as a middle ground.
Enable pro-rata for mid-year purchases, then export the full schedule as CSV for your accounting software.

FAQ

Straight-line spreads the depreciable amount (Cost − Salvage) evenly over the asset's useful life. Each year the deduction is identical: (Cost − Salvage) ÷ Life. It's the simplest method and preferred when an asset loses value uniformly over time.

DDB applies twice the straight-line rate (2 ÷ Life) to the beginning book value each year. This front-loads depreciation — useful for tech and vehicles. When the DDB amount falls below straight-line on the remaining balance, the calculator switches to SL so the asset reaches salvage value exactly.

If an asset is purchased on 1 July, only 6 months of Year 1 depreciation is claimed that year. The remaining 6 months spills into an extra final period, so the schedule has one more row than the useful life. Total depreciation always equals Cost − Salvage.