Depreciation Calculator

Written by Great Medico

Updated September 25, 2026 •3 min read

Share Print Save

A financial result is only as useful as the inputs behind it. Depreciation Calculator estimates straight-line depreciation and the remaining book value of an asset from cost, salvage value, useful life, and years elapsed, so you can test the scenario with numbers that match your own situation.

What this calculator does

Depreciation Calculator estimates straight-line depreciation and the remaining book value of an asset from cost, salvage value, useful life, and years elapsed. The visible form contains Depreciation method, Asset cost, Salvage value, Useful life, Years elapsed, Declining-balance rate. These are the inputs that define this calculator’s scope. If a value, rule, or adjustment is not represented by a working field, it should not be assumed to be included in the result.

How to use it

Enter Depreciation method, Asset cost, Salvage value, Useful life, Years elapsed, then complete the remaining displayed fields: Declining-balance rate. Enter percentage or rate fields on the scale shown by the form rather than converting them to decimals yourself. Keep monetary inputs in the same currency, or use the currency selector when one is provided. Keep time and payment-frequency assumptions consistent with the labels on the page. Before calculating, recheck Depreciation method and the other values that materially affect the result. For a clean comparison, hold the other inputs constant while changing one assumption at a time so you can see what is driving the result.

How the calculation works

Straight-line annual depreciation = (asset cost − salvage value) ÷ useful life. Accumulated depreciation is annual depreciation × years elapsed, capped at the depreciable base; book value = asset cost − accumulated depreciation. This is the calculation method that should anchor any manual check of the output. If a displayed field does not affect the current calculation, that limitation is stated below rather than silently treating the field as part of the formula.

Example

With the displayed example values (Depreciation method = straight_line, Asset cost = 100,000, Salvage value = 10,000, and Useful life = 10) and the remaining defaults unchanged, the current calculator returns $64,000.00 for estimated book / actual cash value. Replacing those defaults with your own values recalculates the same relationship; change one input at a time if you want to see which assumption is driving the difference.

How to interpret the result

The result shows accounting value under one simple schedule. It does not estimate resale value or economic obsolescence. Compare results produced from the same definitions and time period. A mathematically larger or smaller number is not automatically better unless the financial context makes that direction meaningful.

Limitations and notes

Tax depreciation, accelerated methods, half-year conventions, impairment, revaluation, disposals, and jurisdiction-specific rules can differ. The current calculation path does not use the visible declining-balance rate. Where the calculator depends on estimates, rates, accounting classifications, or future behavior, test more than one plausible scenario before making a decision.