Enter car ownership and resale data
Use the fields below to measure actual value loss and project the next resale outcome.
Formula used
Actual price drop
Purchase Price - Current Market Value
Price drop percentage
((Purchase Price - Current Market Value) / Purchase Price) × 100
Average monthly drop
Actual Price Drop / Months Owned
Annualized depreciation rate
(1 - (Current Value / Purchase Price)^(12 / Months Owned)) × 100
Net resale value now
(Current Value × Market Factor × Condition Factor) - Repairs - Selling Fees
Projected future resale
max(Floor Value, Current Value × (1 - Annual Depreciation)^(Months / 12) × Future Market Factor × Condition Factor - Repairs - Selling Fees)
How to use this calculator
- Enter the original purchase price and the current market value of the vehicle.
- Add ownership length and mileage change to measure time-based and use-based value erosion.
- Adjust for market softness or strength, condition, expected repairs, and selling fees.
- Include the remaining loan balance to see whether selling now leaves positive or negative equity.
- Set future holding months and a projected depreciation rate to estimate a later resale outcome.
- Press the calculate button to display results above the form, then export them as CSV or PDF.
Example data table
| Purchase Price | Current Value | Months Owned | Miles Driven | Actual Drop | Drop % | Annualized Rate | Projected 12-Mo Resale |
|---|---|---|---|---|---|---|---|
| $35,000 | $26,000 | 24 | 24,500 | $9,000 | 25.71% | 13.80% | $21,122 |
| $48,000 | $36,900 | 30 | 29,000 | $11,100 | 23.13% | 10.01% | $31,910 |
| $22,500 | $16,800 | 18 | 19,200 | $5,700 | 25.33% | 17.55% | $13,974 |
Frequently asked questions
1. What does a car price drop calculator measure?
It measures how much value a vehicle has lost since purchase. It also estimates current resale proceeds, equity after loan payoff, and projected future value loss.
2. Why is annualized depreciation useful?
Annualized depreciation converts total value loss into a yearly rate. That helps compare different cars, ownership periods, and selling scenarios on the same scale.
3. Should I enter trade-in value or private sale value?
Use whichever price reflects your planned exit path. Trade-in values are usually lower, while private sale values can be higher but may involve added time, repairs, and selling costs.
4. What does market adjustment mean?
Market adjustment captures broader pricing pressure outside your car's condition. Supply shortages, fuel prices, seasonal demand, brand strength, and regional buyer preferences can move prices up or down.
5. Why include repairs and selling fees?
Gross market value is not the same as usable proceeds. Repairs, detailing, listing fees, auction charges, or dealer commissions reduce what you actually keep after the sale.
6. What is negative equity?
Negative equity happens when your loan payoff is higher than your net resale value. In that case, selling the vehicle requires extra cash to clear the loan.
7. Can this help decide whether to sell now or later?
Yes. Compare current net proceeds with projected future resale. If additional depreciation outweighs benefits from waiting, selling sooner may protect more value.
8. Does mileage always reduce value at the same rate?
No. Mileage impact changes by brand, vehicle type, maintenance history, and buyer expectations. This tool shows average loss per mile, which is useful for benchmarking, not a universal rule.