Calculateur d'Indice — Formule

How to Calculate an Index Number

Formula

Index = (Current Value / Base Value) * Base Index

An index number expresses a value relative to a base period. The base period is typically set to 100. An index of 125 means a 25% increase from the base. Index numbers are used for price indices (CPI), stock indices, and economic indicators.

Exemple Résolu

A commodity priced at $125 today vs. $100 in the base year.

  1. Index = (125 / 100) * 100 = 125
  2. Change from base = ((125/100) - 1) * 100 = 25%
  3. The price is 25% above the base period.