Calculadora de Número Índice
Calcule números índice para medir variações relativas de preços ou quantidades ao longo do tempo.
Index Number
125.0000
Index Number vs Current Period Value
Formula
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.
Exemplo Resolvido
A commodity priced at $125 today vs. $100 in the base year.
- 01Index = (125 / 100) * 100 = 125
- 02Change from base = ((125/100) - 1) * 100 = 25%
- 03The price is 25% above the base period.
Perguntas Frequentes
What is the Consumer Price Index (CPI)?
CPI is a weighted index that measures the average price change of a basket of consumer goods over time. It uses a base year (index = 100) and tracks how prices evolve, serving as the primary measure of inflation.
What is the difference between a simple and weighted index?
A simple index uses a single item or unweighted average. A weighted index (like CPI) assigns weights based on relative importance or expenditure shares, giving a more accurate composite picture.
How do I change the base year?
To rebase an index from old base B1 to new base B2: New Index = (Old Index / Index at B2) * 100. This rescales all values so the new base period equals 100.
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