Calculating your first year depreciation is straightforward once you know the Double Declining Balance formula and what each input means. This guide explains the method in plain language, walks through a manual calculation, and gives worked examples you can follow — then you can do it instantly with the Double Declining Balance Calculator.
What is Double Declining Balance?
The Double Declining Balance calculation tells you your first year depreciation from a few simple inputs. The figure you are solving for here is the first year depreciation, expressed in INR.
The Double Declining Balance formula
The core formula is:
First year depreciation = Asset cost (book value) × 2 ÷ Useful lifeHere is what each input means:
- Asset cost (book value) — a money amount. Example: ₹1,00,000.
- Useful life — a value measured in years. Example: 5 years.
How to calculate it step by step
- Write down the asset cost (book value) (for example, ₹1,00,000).
- Write down the useful life (for example, 5 years).
- Apply the formula above to get your first year depreciation.
- Double-check the result with the Double Declining Balance Calculator.
Worked examples
Example 1
| Input / Output | Value |
|---|---|
| Asset cost (book value) | ₹1,00,000 |
| Useful life | 5 years |
| First year depreciation | ₹40,000 |
| Depreciation rate | 40.0% |
| Book value after year 1 | ₹60,000 |
With asset cost (book value) of ₹1,00,000 and useful life of 5 years, the first year depreciation works out to ₹40,000.
Example 2
With asset cost (book value) of ₹2,00,000 and useful life of 5 years, the first year depreciation works out to ₹80,000.
| Result | Value |
|---|---|
| First year depreciation | ₹80,000 |
| Depreciation rate | 40.0% |
| Book value after year 1 | ₹1,20,000 |
Example 3
With asset cost (book value) of ₹50,000 and useful life of 5 years, the first year depreciation works out to ₹20,000.
| Result | Value |
|---|---|
| First year depreciation | ₹20,000 |
| Depreciation rate | 40.0% |
| Book value after year 1 | ₹30,000 |
Tips for an accurate result
- Keep your units consistent — mixing, say, months with years or grams with kilograms is the most common source of error.
- Round only at the very end. Rounding inputs early can shift the final answer noticeably.
- Re-run the numbers whenever an input changes, rather than estimating from an old result.
Prefer not to do the maths by hand? — the Double Declining Balance Calculator does it instantly, for free, with the formula and a worked example built in.
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