# Depreciation Calculator

> Calculate the depreciation of an asset over its useful life using Straight-Line or Double-Declining Balance methods.

Page: https://askcalculators.com/calculator/depreciation-calculator/
Definition: https://askcalculators.com/calculator/depreciation-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/depreciation-calculator/schema.json
Version: 7.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/depreciation-calculator/?assetCost=25000&salvageValue=5000&usefulLife=5&method=straight

## Inputs
- assetCost: Asset Cost; type=number; optional; default=25000
- salvageValue: Salvage Value; type=number; optional; default=5000
- usefulLife: Useful Life (Years); type=number; optional; default=5
- method: Method; type=select; optional; default=straight

## Outputs
- result: Result; format=text; primary

## Formula
Straight-line: (cost − salvage) ÷ life; declining balance: current book value × rate; sum-of-years-digits: depreciable basis × remaining life ÷ life-year sum.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.