The N-score („nombre de classement“) describes the overall performance of the observatory chronometer and determines its ranking in the respective year of competition. Further, it serves as a universal comparison-value across different years. The lower the N-score the better.

Enter the exact values (E, C, S, R, P) found on the „Bulletin de March“ to calculate the N-score in accordance with the rules of competition ("Règlement") valid at that time.