Index Number Calculator

Rebase a series to an index (base period = 100) to compare growth of values on different scales.

Also known as index calculator, base 100 index, rebasing index.

Enter values

Result

Latest index

124

Index (base = 100)

Rebase a series to an index (base period = 100) to compare growth of values on different scales.

Also known as: index calculator, base 100 index, rebasing index.

Enter values, base period (position).
The result updates instantly as you type — press Calculate (or Enter) at any time.
Review the breakdown shown under the main result.
Use Copy result or Share to save the answer or send a link with your inputs.

Index = value ÷ base value × 100

Using the values pre-filled in the calculator above:

the calculator returns: