Depreciation Calculator
A depreciation calculator estimates how much value an asset loses over time. It can be used for equipment, vehicles, machinery, furniture, and other business or personal assets that decrease in value as they are used or age.
What Is Depreciation?
Depreciation is the process of allocating the cost of a tangible asset over its useful life. An asset's value may decrease because of usage, wear and tear, age, or technological changes.
Straight-Line Depreciation Formula
The straight-line method spreads depreciation evenly over the asset's useful life:
Annual Depreciation = (Cost β Salvage Value) Γ· Useful Life
where Cost is the original purchase price, Salvage Value is the estimated value at the end of its useful life, and Useful Life is the expected number of years the asset will be used.
Example of Straight-Line Depreciation
Suppose a machine costs $10,000, has an estimated salvage value of $2,000, and has a useful life of 5 years.
Annual Depreciation = (10,000 β 2,000) Γ· 5
Annual Depreciation = $1,600
The machine would therefore have a depreciation expense of $1,600 per year using the straight-line method.
Book Value
Book value is the asset's original cost minus accumulated depreciation:
Book Value = Cost β Accumulated Depreciation
After 3 years in the example above:
Accumulated Depreciation = 3 Γ $1,600 = $4,800
Book Value = $10,000 β $4,800 = $5,200
Declining Balance Depreciation
The declining balance method applies a fixed depreciation rate to the asset's book value rather than its original cost. This results in higher depreciation in the earlier years and lower depreciation later.
A simplified formula is:
Depreciation = Beginning Book Value Γ Depreciation Rate
Double Declining Balance Method
The double declining balance method uses twice the straight-line depreciation rate:
Rate = 2 Γ· Useful Life
Annual depreciation is then based on the asset's beginning book value, subject to applicable accounting rules and limits.
Depreciation Methods
| Method | How It Works |
|---|---|
| Straight-line | Equal depreciation expense each period. |
| Declining balance | Higher depreciation in earlier periods. |
| Double declining balance | Accelerated depreciation using twice the straight-line rate. |
Depreciation Example
| Input | Value |
|---|---|
| Asset cost | $10,000 |
| Salvage value | $2,000 |
| Useful life | 5 years |
| Annual straight-line depreciation | $1,600 |
Why Calculate Depreciation?
Depreciation calculations help estimate an asset's book value and allocate its cost across the periods in which it is used. Businesses may also use depreciation when preparing financial statements and tax calculations, although tax depreciation rules can differ from accounting methods.
Common Mistakes to Avoid
Do not confuse depreciation with the actual market value of an asset. Accounting depreciation is a method of allocating cost and may not match the price the asset could be sold for.
Also make sure the useful life and salvage value are appropriate for the depreciation method being used.
Quick Summary
A depreciation calculator estimates the loss or allocation of an asset's value over time. Under the straight-line method, annual depreciation is calculated as (Cost β Salvage Value) Γ· Useful Life. Other methods, such as declining balance and double declining balance, recognize more depreciation during earlier periods.