Depreciation Calculator guide
Depreciation allocates an asset’s depreciable cost across its useful life. Different methods change the timing of expense but normally not the total depreciable basis.
The preserved calculator includes straight-line, declining-balance, double-declining, sum-of-years-digits, units-of-production, multiple assets, tax impact, replacement analysis, charts, schedules, history, and exports.
How to use the depreciation calculator
- Enter current amounts: Use current, documented values from the same relevant period.
- Enter assumptions: Use realistic rates, percentages, periods, and costs where applicable.
- Review the full result: Review the primary estimate together with its supporting measures.
- Stress-test risk: Model less favorable timing, value, cost, or rate assumptions.
Formula and variables
The estimate applies the entered values and assumptions to the stated formula.
Straight-line depreciation = (asset cost − salvage value) / useful life- Inputs — Entered values
- The amounts, percentages, or periods supplied to the calculator.
- Result — Calculated output
- The estimate produced by applying the formula to the entered values.
Worked example: depreciation calculator
A user enters a representative set of values and assumptions.
- Key inputs
- Amounts, percentages, periods, and costs
- Apply the stated formula.
- Include all relevant entered values and constraints.
- Compare the result with an alternative scenario.
Result: Annual depreciation, accumulated depreciation, ending book value, full schedule, method comparisons, cash-flow impact, and replacement analysis.
Use the estimate as a planning input and verify important decisions with current records or qualified guidance.
Understanding your results
Primary estimate
Annual depreciation, accumulated depreciation, ending book value, full schedule, method comparisons, cash-flow impact, and replacement analysis.
Risk measures
Use supporting payment, leverage, cost, and cash figures together.
Assumptions
- Entered rates and costs remain constant.
- Payments and cash flows occur on schedule.
Limitations
- Taxes, legal terms, accounting treatment, and transaction-specific costs may differ.
- Future values, timing, and rates are uncertain.
Common mistakes
- Reviewing only the headline result.
- Ignoring relevant costs, timing, or supporting measures.
- Using optimistic timing or value assumptions.
- Treating an estimate as a guaranteed outcome.
Practical use cases
Compare scenarios consistently
Change one assumption at a time or enter each alternative using the same basis.
Plan cash requirements
Estimate funds needed before committing.
Planning and decision guide
Stress-test the assumptions
Accounting useful life and salvage value should reflect the applicable reporting policy.
Review the important risks
Tax depreciation rules may differ from book depreciation.
Verify the source values
Do not depreciate below the modeled salvage value.
Frequently asked questions
What is depreciable basis?
Asset cost minus expected salvage value under the basic model.
What is double-declining balance?
An accelerated method that applies twice the straight-line rate to beginning book value, subject to the salvage floor.
Is depreciation a cash expense?
No, but depreciation expense can affect taxable income and financial reporting.
Sources and review
- Publication 946, How To Depreciate Property — Internal Revenue Service. Accessed 2026-07-10.
Reviewed 2026-07-10.