VIN check digit calculator

Client

VIN check digit calculator captures users who want the computed ninth symbol without decoding full vehicle history. Paste the frame; read expected check character and field breakdown.

Using the calculator

Paste or type the full VIN. On pass, the ninth symbol matches the weighted sum remainder. On fail, the tool shows the symbol that would validate the other sixteen positions.

Privacy: parsing runs only in your browser. This page does not query DMV, insurance, or manufacturer databases—only the published mod-11 rule for the ninth character.
?

After removing spaces and hyphens, the frame must be exactly 17 characters. Letters I, O, and Q are forbidden everywhere. Position 9 (index 8) is the check symbol: decimal 0–9 or X for remainder ten. Each symbol maps to a numeric value, is multiplied by a fixed weight for its position, products are summed, and sum mod 11 must equal the check symbol’s value (X → 10).

Result

Passes check digit — weighted sum mod 11 is 10; expected X.

  • WMI (positions 1–3): 1HG
  • Attributes (4–8): BH41J
  • Check (9): X
  • Model year code (10): M
  • Plant (11): N
  • Sequential (12–17): 109186

Common use cases

  • Double-check manual retyping before submitting title paperwork internally.
  • Teach mod-11 arithmetic with a working calculator link.

Common mistakes to avoid

  • Calculating check digit on partial 16-character strings

    Run the algorithm on the full 17-character frame including the check position.

FAQ

Which position is the check digit?

The ninth character (index eight) in a 17-character North American-style VIN.

Common search terms

Phrases people search for that match this tool. See the full long-tail keyword index.

  • vin check digit verifier online
  • validate vin number mod 11 free
  • ninth position vin checksum browser
  • iso 3779 vin check digit calculator
  • vehicle identification number check digit locally

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