How to use

This calculator estimates book depreciation by straight-line or double-declining balance, switching to straight-line when needed so the schedule reaches salvage value by the end of the selected life. Choose a year to inspect its opening, charge and closing book value.

Choose a depreciation method.
Enter cost, salvage value and useful life.
Choose the year to inspect.
Calculate to see opening value, depreciation, accumulated depreciation and closing value.

How it is calculated

Straight-line=(cost−salvage)÷life; DDB starts at 2÷life and is compared with straight-line on the remaining depreciable balance

Example

For cost 10,000, salvage 1,000 and 5-year life under straight-line: depreciable amount is 9,000, annual depreciation 1,800 and year-1 closing book value 8,200.

Important notes

This is a general book-depreciation model. It does not apply tax systems such as MACRS or country/asset-specific rules. Useful life, salvage value and accounting policy vary; this is not tax or financial advice.

Frequently asked questions

Straight-line vs declining balance?

Straight-line spreads depreciation evenly; declining balance front-loads more expense.

Can book value fall below salvage?

No. The model clamps depreciation at salvage value.

Can I use this for a tax return?

Not by itself; use the applicable tax rules or a qualified professional.

Is this calculator free?

Yes. It is free to use and requires no account.

Depreciation Calculator