Q: What is the purpose of this tool?
The Vehicle Depreciation Calculator calculates the loss in value of a vehicle following a traffic accident in accordance with the official formula. It applies the methodology determined under the General Conditions of Compulsory Liability Insurance for Motor Vehicles, Annex-1 (Official Gazette 4/12/2021-31679).
Q: Which formula does it use?
Vehicle depreciation is calculated using the following formula: DK = Piyasa Değeri × R × K × H × G. Here, R is the market value coefficient, K is the usage coefficient, H is the damage coefficient, and G is the general evaluation coefficient. For motorcycles (Code F), an additional multiplier of ×2.5 is applied to the final result.
Q: Who can use it?
The tool is designed for lawyers, insurance adjusters, traffic accident victims, and insurance companies. It is for informational purposes only and does not constitute legal advice.
Q: Does the tool work offline?
Yes. It is entirely HTML and JavaScript-based and does not require a server connection. You can use it without an internet connection by opening the file in your browser.
Q: How many tabs are in the tool?
There are three tabs. The Vehicle Information tab is the main form where you enter the basic features and general parameters of the vehicle. The Damaged Parts tab is the section where you select and detail the parts damaged in the accident. The Result tab displays the calculated depreciation, formula details, and the parts summary.
Q: Which types are available in the vehicle group selection?
Supported vehicle groups and codes are: Automobile (A), Taxi (A), Minibus (B), Bus (B), Pickup Truck (C), Truck (C), Tow Truck (C), Construction Equipment (D), Tractor (D), Agricultural Machine (D), Special Purpose Vehicle (Ç), Trailer (E), Motorcycle (F), and Tanker (Ç). The vehicle codes determine which R and K tables will be used and which parts list will be displayed.
Q: What should I enter as the market value?
The average of the insurance (Kasko) value and the TOBB (Union of Chambers and Commodity Exchanges of Turkey) list value should be entered. This value forms the basis of the multiplier in the formula and is also used to determine the R coefficient.
Q: What is entered in the mileage field?
The mileage of the vehicle at the time of the accident is entered. This value determines the K (usage) coefficient. As the mileage increases, the K coefficient decreases; thus, high-mileage vehicles have lower depreciation. For construction equipment and tractors (Code D), this field changes to "Operating Hours."
Q: What does total damage amount including VAT mean?
It is the total cost of the repair performed in the accident, including VAT. This amount is used to calculate the T coefficient: T = (Hasar Tutarı / Piyasa Değeri) × 100 × 0.10. No deductions (tenzil) are made; the gross amount is entered.
Q: How is R (Market Value Coefficient) determined?
It is automatically calculated based on the market value and the vehicle code. Different tables apply to Code A and F vehicles (automobiles, motorcycles) versus other vehicles. As the market value increases, the R coefficient rises (from 0.65 to 1.00).
Q: How is K (Usage Coefficient) determined?
It is automatically calculated based on the mileage and the vehicle code. Different mileage intervals are defined for Code A/F, B/C/Ç/E, and D (construction equipment) vehicles. As the mileage decreases, the K coefficient rises (from 0.70 to 1.00).
Q: What does the "Commercial or Rental Vehicle" option do?
It activates the G.1 parameter and subtracts 0.05 from the general evaluation coefficient (G). Depreciation for commercial or rental vehicles is calculated lower than for normal vehicles.
Q: What is the SBM Damage History Record Count?
It refers to the number of previous damage records of the vehicle in the SBM (Insurance Information and Monitoring Center) system. For each record, 0.03 is subtracted from the G coefficient (G.2 parameter). It can be selected between 0 and 5.
Q: What is the G.3 (Mileage Proximity) parameter?
This parameter is calculated automatically and is not entered by the user. If the mileage of the vehicle is within 1,000 km of a lower limit in the K coefficient table, +0.05 is added to the G coefficient. This ensures a fairer evaluation for vehicles close to the threshold values.
Q: How is G (General Evaluation Coefficient) calculated?
It is calculated using the formula: G = 1 + G.1 + G.2 + G.3. G.1 is the commercial vehicle discount (-0.05 or 0), G.2 is the SBM damage record discount (-0.03 per record), and G.3 is the mileage proximity bonus (+0.05 or 0).
Q: How is a damaged part added?
After selecting the vehicle group and moving to the "Damaged Parts" tab, all parts belonging to that vehicle code are listed. A part is added by clicking on it. It is possible to add the same part more than once.
Q: How many parts are defined for each vehicle code?
There are 32 parts for Code A (automobile), 15 parts for Code B (minibus/bus), 13 parts for Code C (pickup/truck), 6 parts for Codes Ç and D (special purpose/construction equipment), 6 parts for Code E (trailer), and 4 parts for Code F (motorcycle).
Q: Which options are displayed after a part is added?
Three options are determined for each part. "Process" is selected as replacement or repair. In replacement, the P (part replacement coefficient) is applied. "Repair Level" is selected as light, medium, or high; each has a different coefficient value. "Paint" is selected as none, full, or local; paint also adds a separate coefficient.
Q: What do the repair levels mean?
Light repair (Oİ-Hafif): superficial damage to the part, low coefficient. Medium repair (Oİ-Orta): damage requiring significant correction, medium coefficient. High repair (Oİ-Yüksek): serious structural repair, highest coefficient. Some parts do not have a repair option; only replacement is possible.
Q: How does the paint coefficient work?
If no painting is done, the coefficient is 0. Full paint (Yİ-Tam) adds a high coefficient, while local paint (Yİ-Lokal) adds a lower coefficient. Some parts have no paint option (e.g., airbags) or only a full paint option.
Q: What does "Total HK" mean?
HK (Damage Coefficient) is the sum of the Pİ/Oİ and Yİ values of all selected parts: HK = Σ(Pİ veya Oİ + Yİ). This value is used together with T in the calculation of the H coefficient.
Q: How do I remove an added part?
There is a red "Kaldır" (Remove) button at the top right of each part. You can remove the part from the list by clicking this button.
Q: What is displayed on the result screen?
The calculated depreciation is shown in a large number at the top. Below it is the calculation detail card: market value, vehicle code, and the R, K, HK, T, H, and G coefficients are listed separately. In the G detail section, the G.1, G.2, and G.3 values are shown. The "Formülü Göster" button displays the entire calculation step-by-step as a formula.
Q: How is the H coefficient calculated?
It is calculated with the formula: H = (HK + T) / 100. HK is the total damage coefficient of the selected parts. T is the damage amount coefficient: T = (KDV Dahil Hasar Tutarı / Piyasa Değeri) × 100 × 0.10.
Q: Why is an extra multiplier applied to motorcycles?
In Code F vehicles (motorcycles), a multiplier of ×2.5 is applied to the calculated depreciation. This is the adjustment coefficient determined for motorcycles in the General Conditions Annex-1. A note regarding the application of this multiplier is displayed on the result screen.
Q: How can I see the formula details?
By clicking the "Formülü Göster" button on the result screen, you can see all the calculation steps: HK total, T calculation, H calculation, G calculation, and the final DK formula are displayed in order. You can hide them by clicking the same button again.
Q: What does the damaged parts summary show?
It lists the code, name, type of process (replacement/repair level), paint status, and the individual coefficient value of each selected part.
Q: Why are different tables used for different vehicle codes?
The market value range, normal mileage usage, and part structure of each vehicle type are different. For example, for an automobile, 50,000–100,000 km corresponds to medium usage, whereas for a truck, these values are much higher. Therefore, R and K tables are defined separately according to the vehicle code.
Q: What is the difference between A/F and other codes in the R coefficient?
In Code A and F vehicles (automobiles, motorcycles), the R coefficient starts at 0.65 in the 0–49,999 TL range and reaches 1.00 at 750,000+ TL. In other vehicles (B, C, Ç, D, E), the ranges are wider: it starts at 0.65 in the 0–249,999 TL range and reaches 1.00 at 1,500,000+ TL.
Q: Are the results of this tool final?
No. While this tool applies the General Conditions Annex-1 formula, it is for informational purposes only. The final determination of depreciation is finalized by an expertise report, a court expert report, or the assessment of the insurance company. It does not constitute legal advice.
This FAQ document has been created based on the version of the Vehicle Depreciation Calculator prepared in accordance with the General Conditions of Compulsory Liability Insurance for Motor Vehicles Annex-1 (RG-4/12/2021-31679).
