Quick start
- Open the Depreciation Calculator.
- Start with the fields shown on the Depreciation Calculator page and enter values in the same units used by the labels.
- Use the first example, "Straight-line asset: $12,000 cost, $2,000 salvage, 5-year life, age 2", if you want to see a filled-out estimate before entering your own values.
- Calculate, read the formula line, then copy the result only after the amounts, rates, and term look right.
Best uses
These are the situations this tool is meant for. If your task is close to one of these, the examples and notes below can help you choose the right inputs.
- Estimate book value after straight-line depreciation.
- Compare straight-line and declining-balance methods.
- Check accumulated depreciation for a simple asset example.
- Understand depreciation math before reviewing tax or accounting rules.
What this calculator is for
Use this free depreciation calculator to estimate accumulated depreciation, annual depreciation, and book value from cost, salvage value, useful life, age, and method. It is best for estimate book value after straight-line depreciation. and for comparing scenarios before you rely on a number.
Good fit examples: Estimate book value after straight-line depreciation. Compare straight-line and declining-balance methods.
What to enter
Finance estimates are sensitive to small input changes. Check whether a field expects a monthly amount, annual amount, dollar value, or percent before calculating.
- Start with the fields shown on the Depreciation Calculator page and enter values in the same units used by the labels.
- Use annual rates as percentages, such as 6.5 for 6.5%, and keep monthly amounts in monthly fields.
- Try the first example first: $12,000 cost, $2,000 salvage, 5-year life, age 2. Then replace one number at a time so you can see what changed.
Example walkthrough
Try the calculator example: Straight-line asset: $12,000 cost, $2,000 salvage, 5-year life, age 2. The example result is Book value and accumulated depreciation.
- Straight-line asset uses $12,000 cost, $2,000 salvage, 5-year life, age 2, and the result focuses on book value and accumulated depreciation.
- Use declining balance as a quick comparison so the guide is not based on only one scenario.
Formula and steps
In plain language: Straight-line depreciation divides depreciable amount by useful life. Declining balance applies a percentage rate to the remaining book value while respecting salvage value. If the result seems too high or too low, first check whether each field expects a monthly amount, annual amount, dollar value, or percent.
The formula line on the calculator page is there so the number is not a black box. If the estimate is surprising, check the formula line and the inputs before using the answer in a budget, comparison, or planning note.
How to read the answer
Start with the headline result. Then read the supporting lines to see what made the number larger or smaller, such as rate, term, principal, tax, fees, or contributions.
- Read the large answer first, because it is the main result the calculator is built around.
- Then read the supporting lines. They explain what drove the result, such as payment, interest, total cost, savings gap, return, or time.
- In plain language: Straight-line depreciation divides depreciable amount by useful life. Declining balance applies a percentage rate to the remaining book value while respecting salvage value. If the result seems too high or too low, first check whether each field expects a monthly amount, annual amount, dollar value, or percent.
Common mistakes to avoid
Most bad finance estimates come from mixing rates, terms, monthly amounts, and annual amounts. The other common mistake is using a planning estimate as if it were a final quote.
- Do not mix monthly and annual amounts.
- Do not copy an answer before checking the rate and term.
- This is simplified book-value math. It does not determine tax depreciation, MACRS class life, accounting policy, partial-year conventions, recapture, or compliance. Real finance decisions can also depend on fees, timing, local rules, credit details, and provider-specific terms.
What to try next
A related calculator can help check the same money question from another angle before you rely on one result.
- Try average return calculator next to compare the same question from another angle.
Sources and estimate notes
This guide links to public financial, consumer, statistical, or tax references where they are useful for understanding the calculator context.
Source links improve transparency, but they do not turn a quick calculator into professional advice or a final loan, tax, payroll, or investment answer.
Examples from the calculator
Book value and accumulated depreciation
Declining-balance estimate
First-year estimate
FAQ in plain language
When should I use the Depreciation Calculator?
Use it for early planning and side-by-side comparisons, especially for tasks like these: Estimate book value after straight-line depreciation. Compare straight-line and declining-balance methods. Treat the answer as a planning estimate, not a final quote.
What is the Depreciation Calculator doing with my numbers?
In plain language: Straight-line depreciation divides depreciable amount by useful life. Declining balance applies a percentage rate to the remaining book value while respecting salvage value. If the result seems too high or too low, first check whether each field expects a monthly amount, annual amount, dollar value, or percent.
What does this estimate leave out?
This is simplified book-value math. It does not determine tax depreciation, MACRS class life, accounting policy, partial-year conventions, recapture, or compliance. Real finance decisions can also depend on fees, timing, local rules, credit details, and provider-specific terms.
Related tools
- Average Return Calculator Estimate cumulative return, simple average annual return, and CAGR.
- Business Loan Calculator Estimate business loan payment, interest, fees, and cash received.
- Finance Calculator Project a general balance from starting amount, monthly change, rate, and time.
Privacy and copying results
Recent answers stay visible only while you work in the current browser tab. They are not sent to a server.
Use Copy answer when you want to paste the expression and result into notes, homework, a message, or another document. Check the units and assumptions before copying.