What's My Collector Car Worth?

The Turbopedia estimate uses interquartile range (IQR) analysis of comparable auction sales matched to the same generation of the selected car. When you enter a 1995 Porsche 911, the system resolves that to the 993 generation (1993–1998) and analyzes all sold results for that generation across Bring a Trailer, RM Sotheby's, Mecum Auctions, Bonhams, Gooding & Company, and other tracked sources. The median sale price becomes the center of the estimate, with the 25th and 75th percentiles defining the typical range.

This approach differs from Hagerty's valuation tool (which uses condition-specific pricing from a curated database with limited free lookups), Kelley Blue Book and NADA Guides (which focus on modern cars and dealer wholesale, not auction transactions), and Classic.com (which paywalls price history beyond the most recent results). Turbopedia's estimate is free, unlimited, and backed by real transaction data — not appraiser opinions or dealer surveys.

Condition is the largest single factor. The Turbopedia estimate applies a simple multiplier — Excellent (1.3×), Good (1.0×), Fair (0.7×), Project (0.4×) — as a starting framework. In practice, the gap between a concours-restored example and a running project can be 5× or more for desirable models. The Classic Car Club of America (CCCA) and other organizations maintain formal grading standards, but auction houses describe condition in their own terms.

Provenance and documentation create value that raw specs cannot capture. Matching numbers (original engine, transmission, body panels), complete service history, celebrity or racing ownership, and low mileage relative to age all push sale prices above the generation median. Conversely, salvage titles, missing documentation, aftermarket modifications, or repainted cars typically sell below the interquartile range.

Market timing and liquidity also matter. Turbopedia tracks unsold lots (reserve-not-met, withdrawn, no bids) alongside successful sales — a data point most competitors exclude. A high unsold rate for a specific model signals that seller expectations may be ahead of buyer demand. Data current as of March 2026.

Auction results reflect real market transactions where a buyer and seller agreed on a price in a competitive, time-limited environment. Dealer asking prices — what you see on Hemmings, ClassicCars.com, or AutoTrader Classics — represent what sellers hope to get, not what cars actually sell for. The spread between asking price and auction hammer price can be 15–30% for mainstream collector cars.

Turbopedia's estimate is based exclusively on auction results because they are the most transparent, verifiable price data in the collector market. Every result comes from a public auction with a documented sale date, auction house, and final price. Note that auction hammer prices do not include buyer's premiums, which vary by house: Bring a Trailer charges 5%, RM Sotheby's 12–15%, Mecum 10%, and Barrett-Jackson 10%.

The Turbopedia estimate is a data-backed orientation tool, not a formal appraisal. For insurance agreed-value policies (Hagerty, Grundy, American Collectors), estate settlements, divorce proceedings, donation valuations, or any legal purpose, you need a certified appraiser who physically inspects the car. The American Society of Appraisers (ASA) and International Society of Appraisers (ISA) maintain directories of qualified automotive appraisers.

Disclaimer: This estimate is based on historical auction results and is not a formal appraisal. Actual values vary based on condition, provenance, documentation, and current market conditions. Turbopedia does not guarantee the accuracy of any estimate. See Terms of Service for full details.