Auto Calculator Rosson

The Rosson method is a simple way to estimate how much your car will depreciate each year. This calculator helps you project your vehicle's value over time using this method.

What is the Rosson Method?

The Rosson method is a simplified approach to calculating vehicle depreciation. It assumes that vehicles depreciate at a constant rate each year, regardless of mileage or condition. This method is often used for quick estimates when more detailed information isn't available.

Note: The Rosson method provides an estimate, not an exact value. Actual depreciation may vary based on market conditions, vehicle condition, and other factors.

How to Use This Calculator

Enter the purchase price of your vehicle in the "Initial Value" field.
Enter the expected salvage value (what you expect to get if you sell the car) in the "Salvage Value" field.
Enter the number of years you expect to own the vehicle in the "Years" field.
Click "Calculate" to see your annual depreciation rate and projected values.

Rosson Formula

The Rosson method calculates annual depreciation using this simple formula:

Annual Depreciation Rate = (Initial Value - Salvage Value) / Years

Projected Value After N Years = Initial Value - (Annual Depreciation Rate × N)

Where:

Initial Value = Purchase price of the vehicle
Salvage Value = Expected value when you sell the vehicle
Years = Number of years you plan to own the vehicle

Worked Example

Let's say you buy a car for $25,000 and expect to sell it for $10,000 after 5 years. Here's how the calculation works:

Annual Depreciation Rate = ($25,000 - $10,000) / 5 = $3,000 per year

After 3 years: $25,000 - ($3,000 × 3) = $16,000

After 5 years: $25,000 - ($3,000 × 5) = $10,000

This shows your car would depreciate by $3,000 each year, reaching your expected salvage value after 5 years.

FAQ

Is the Rosson method accurate?: The Rosson method provides a rough estimate. Actual depreciation may vary based on market conditions, vehicle condition, and other factors.
Can I use this for any type of vehicle?: Yes, the Rosson method can be applied to any vehicle, but it's most useful for estimating depreciation of similar vehicles in the same market.
What if I sell the car before the expected years?: The calculator shows projected values, but you can use the formula to calculate the value at any point in time.
Does this account for inflation?: No, the Rosson method doesn't account for inflation. For more precise estimates, consider using a depreciation calculator that includes inflation factors.
Can I use this for commercial vehicles?: The Rosson method can be adapted for commercial vehicles, but you may need to adjust the salvage value and depreciation rates based on industry standards.