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Calculate asset depreciation using straight-line, declining balance & SYD methods.
Depreciation Calculator is a free browser-based tool that helps you calculate asset depreciation using straight-line, declining balance & syd methods. It is part of ToolsMonk's business tools collection, so you can finish the job without downloading software, creating an account, or jumping between multiple websites.
This tool is especially useful for workflows such as working out annual depreciation of a business asset, tracking an asset's book value over its life, and planning for asset replacement and tax. Because it runs directly in your browser, you can use it on desktop, tablet, or mobile while keeping the process fast and easy for one-off tasks as well as repeat work.
Depreciation Calculator is designed for people who want a practical, privacy-friendly workflow with instant results inside the larger ToolsMonk library.
Enter the asset cost, salvage value, and useful life
Choose the depreciation method
See the depreciation per period and the declining book value
Use it for accounting and planning
Calculates asset depreciation over its useful life
Supports common methods (e.g. straight-line)
Shows the depreciation per period and book value over time
Useful for accounting and asset planning
Runs in your browser — your figures stay on your device
Free, with no signup
Working out annual depreciation of a business asset
Tracking an asset's book value over its life
Planning for asset replacement and tax
Comparing depreciation methods
Depreciation Calculator is a powerful free online tool available on ToolsMonk that helps you calculate asset depreciation using straight-line, declining balance & syd methods. Whether you're a professional, student, or casual user, our depreciation calculator provides instant, accurate results right in your browser without requiring any software installation or account creation.
As part of our Business Tools collection, this tool is designed with simplicity and power in mind. All processing happens client-side, ensuring your data remains completely private and secure. The tool works seamlessly across all modern browsers on desktop, tablet, and mobile devices.
Depreciation Calculator works out how a business asset loses value over its useful life, showing the depreciation per period and the declining book value — essential for accounting and asset planning.
Depreciation exists to spread an asset's cost across the years it's used rather than expensing it all upfront, which gives a truer picture of profitability and, because depreciation is usually tax-deductible, affects tax too. The simplest and most common approach is straight-line: (cost − salvage value) ÷ useful life, spreading the loss evenly each year.
Salvage value is key — it's the asset's estimated worth at end-of-life, subtracted from the cost because you only depreciate the value actually lost, not necessarily down to zero. Accelerated methods like declining balance front-load the depreciation instead, suiting assets that lose value fastest early on and sometimes offering earlier tax benefits.
Because methods and rules vary by jurisdiction and have compliance implications, treat this as informational and confirm specifics with an accountant. Everything runs in your browser, keeping figures private. Pair it with the Car Depreciation and other ToolsMonk finance/business calculators.
Straight-line ((cost − salvage) ÷ life) is the simplest method and a fine default
Subtract salvage value — you depreciate the value lost, not necessarily down to zero
Depreciation method and rules vary by jurisdiction — confirm compliance with an accountant
Common questions about this tool, its workflow, and what to expect before you use it.
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