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Accumulated Depreciation Calculator

Calculate accumulated depreciation and book value for any asset using the straight-line or declining balance method. Instant results with a full formula breakdown.

Author: Naeem Ullah
•Last Updated: July 7, 2026•
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Active Calculation FormulaAccumulated Depreciation = [(Cost − Salvage Value) ÷ Useful Life] × Years Elapsed

Adjust Variables

USD
$
assetCost
Min: $1Max: $500k
USD
$
salvageValue
Min: $0Max: $100k
years
usefulLife
Min: 1 yearsMax: 50 years
years
yearsElapsed
Min: 0 yearsMax: 50 years
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Real-Time ResultsUSD
Annual Depreciation$0
Accumulated Depreciation$0
Current Book Value$0
All calculations are compiled with double-precision floating math directly in this browser frame. Perfect precision guaranteed.

Interactive Step-by-Step Calculation Proofs

View how variables resolve algebraically down to peer-reviewed standard outputs.

Why Use This Calculator

Accumulated depreciation is the total amount of an asset's cost that has been expensed since it was placed in service — it's a contra-asset account, meaning it carries a credit balance and reduces the asset's value on the balance sheet rather than standing alone as an asset itself. Subtracting accumulated depreciation from the asset's original cost gives its book value (also called net book value or carrying value). There are two common ways to calculate it: the straight-line method, which expenses an equal amount every year over the asset's useful life — Annual Depreciation = (Cost − Salvage Value) ÷ Useful Life — and the declining balance method (most commonly double-declining balance), which front-loads larger depreciation expenses in the early years by applying a fixed rate to the asset's remaining book value each year. Straight-line is simpler and more common for financial reporting; declining balance is often used for tax purposes because it accelerates deductions. This calculator computes accumulated depreciation, book value, and the annual (or current-year) depreciation expense under either method — use the proportion calculator if you need to further allocate a depreciation expense across multiple cost centers or departments.

Mathematical Formula Explanation

Calculated standard benchmarks are based on direct functional dependencies. The primary calculation logic follows this formula:

Accumulated Depreciation = Annual Depreciation × Years Elapsed

Straight-Line Method spreads the depreciable base evenly across the asset's useful life, so each year's depreciation is identical. Declining Balance Method instead applies a fixed rate to whatever book value remains at the start of each year — a fundamentally different calculation that front-loads larger depreciation amounts in early years and shrinks over time, rather than the flat annual figure straight-line produces. The two modes aren't the same formula in different forms; they're genuinely different accounting methods with different year-by-year results for the same asset.

Worked Examples (Step-by-Step)

These examples show accumulated depreciation for the same asset calculated two ways — straight-line and double-declining balance — to illustrate how differently the two methods distribute the same total depreciable cost.

Case Scenario 1

Example 1: Straight-Line Depreciation on Equipment

“A company buys equipment for $50,000 with an estimated salvage value of $5,000 and a 10-year useful life. How much accumulated depreciation has built up after 4 years?”

Given Inputs
  • ASSETCOST: 50,000
  • SALVAGEVALUE: 5,000
  • USEFULLIFE: 10
  • YEARSELAPSED: 4
Computed Outputs
  • ANNUALDEPRECIATION: 4,500
  • ACCUMULATEDDEPRECIATION: 18,000
  • BOOKVALUE: 32,000
Case Scenario 2

Example 2: Double-Declining Balance on the Same Equipment

“The same $50,000 asset (10-year life, no salvage value) is instead depreciated using the double-declining balance method. What is the accumulated depreciation after 3 years?”

Given Inputs
  • ASSETCOSTDB: 50,000
  • SALVAGEVALUEDB: 0
  • USEFULLIFEDB: 10
  • YEARSELAPSEDDB: 3
  • RATEMULTIPLIER: 2
Computed Outputs
  • ACCUMULATEDDEPRECIATIONDB: 24,400
  • BOOKVALUEDB: 25,600
  • CURRENTYEARDEPRECIATION: 6,400

Frequently Asked Questions (FAQ)

Accumulated depreciation is the total depreciation expense recorded against an asset from the date it was placed in service through the current date. It builds up year over year as an asset ages, and it's reported on the balance sheet as a deduction from the asset's original cost to arrive at its net book value.

No — accumulated depreciation is a contra-asset account. It's reported in the assets section of the balance sheet, but it carries a credit balance and reduces the related asset's gross value rather than adding to total assets. The asset itself (e.g., equipment or a building) is the asset; accumulated depreciation simply offsets it.

Accumulated depreciation normally carries a credit balance, which is unusual for an asset-side account. Each period, the depreciation expense is recorded as a debit (increasing expenses) and accumulated depreciation is recorded as a credit (increasing the contra-asset balance), which together reduce the asset's net book value without changing its original recorded cost.

Under the straight-line method: (1) Find annual depreciation: Annual Depreciation = (Cost − Salvage Value) ÷ Useful Life. (2) Multiply by the number of years the asset has been in service: Accumulated Depreciation = Annual Depreciation × Years Elapsed. For a $50,000 asset with $5,000 salvage value and a 10-year life, after 4 years: Annual Depreciation = ($50,000 − $5,000) ÷ 10 = $4,500; Accumulated Depreciation = $4,500 × 4 = $18,000.

The straight-line depreciation formula is: Annual Depreciation = (Asset Cost − Salvage Value) ÷ Useful Life. It spreads the depreciable base (cost minus salvage value) evenly across every year of the asset's useful life, producing the same depreciation expense each year — unlike accelerated methods such as declining balance.

The declining balance method applies a fixed depreciation rate to the asset's remaining book value each year, rather than to its original cost — so depreciation is largest in the early years and shrinks over time. Double-declining balance uses twice the straight-line rate (200%). This accelerates expense recognition, which is common for tax reporting, while straight-line's even expense pattern is more common for financial statements.

Accumulated depreciation is listed directly beneath the related fixed asset (property, plant, and equipment) on the balance sheet, shown as a negative or deducted amount: Net Book Value = Gross Asset Cost − Accumulated Depreciation. It does not appear on the income statement — the income statement instead shows the period's depreciation expense, which is the amount added to accumulated depreciation that period.

Depreciation expense is the amount recognized in a single accounting period (e.g., one year) on the income statement. Accumulated depreciation is the running total of all depreciation expense recognized since the asset was acquired, reported on the balance sheet. Each period's depreciation expense is added to accumulated depreciation.

No — accumulated depreciation is capped at the asset's depreciable base (cost minus salvage value). Once an asset is fully depreciated, its book value equals its salvage value (or zero, if no salvage value was assigned) and no further depreciation is recorded, even if the asset remains in use.

Sources & Methodology

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