Depreciation Calculator
Calculate asset depreciation using straight-line, double declining balance, sum of years digits, and units of production methods.
Full year-by-year schedule.
What Is Depreciation? Depreciation is the systematic allocation of an asset’s cost over its useful life. It reflects the decline in value of a physical asset (machinery, vehicles, equipment, buildings) due to use, wear, and obsolescence.
Four Standard Methods
1. Straight-Line (SL) Annual Depreciation = (Cost − Salvage Value) / Useful Life The same amount is expensed each year. Simple, predictable. Most common for buildings and office equipment.
2. Double Declining Balance (DDB) Rate = 2 / Useful Life Year N depreciation = Book Value at Start of Year × Rate Book value cannot fall below salvage value. Accelerated method: higher expense in early years. Common for assets that lose value quickly (vehicles, computers, machinery).
3. Sum of Years Digits (SYD) SYD = Life × (Life + 1) / 2 Year N Depreciation = ((Life − N + 1) / SYD) × (Cost − Salvage Value) Also accelerated; front-loads expense but more gradually than DDB.
4. Units of Production (UOP) Depreciation per Unit = (Cost − Salvage Value) / Total Estimated Units Annual Depreciation = Units Used in Year × Depreciation per Unit Ties depreciation directly to actual use; ideal for manufacturing equipment and vehicles with known mileage.
Key Terms
- Cost: original purchase price of the asset
- Salvage Value: estimated value at end of useful life (scrap value)
- Depreciable Base: Cost − Salvage Value
- Book Value: Cost − Accumulated Depreciation to date
Tax vs Financial Accounting For tax purposes, many jurisdictions use MACRS (Modified Accelerated Cost Recovery System) in the US, which allows even more accelerated depreciation. For financial reporting (GAAP/IFRS), straight-line is most common. This calculator uses accounting depreciation, not tax depreciation.
IRS MACRS useful-life reference (common assets):
| Asset | Useful Life |
|---|---|
| Computers and peripherals | 5 years |
| Vehicles (non-luxury) | 5 years |
| Office furniture | 7 years |
| Heavy machinery and most production equipment | 7 years |
| Residential rental property | 27.5 years |
| Commercial real estate | 39 years |
These are the lives MACRS assigns by class. For GAAP financial reporting you can pick any reasonable life. The IRS table is just a starting point most US small businesses use because it matches what they’ll claim on the tax return anyway.
Choosing a Method Use accelerated methods when:
- The asset generates more revenue/value early in its life
- You want to reduce taxable income in early years Use straight-line when:
- The asset generates equal benefit each year
- Simplicity is preferred
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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