Chained percentage index ledger
Reconstruct a cumulative index from a sequence of multiplicative changes.
Your entries stay in this page’s memory and are not submitted to us. Downloads are generated locally. Reloading or leaving the page clears your entries. Do not enter patient information.
Use comma-separated numeric values on each line. The first line accepts 1–1 values and the second accepts 1–30.
The starting values are hypothetical. Results update as you edit. Use aggregate or synthetic inputs only.
Calculation results
- Index after period 1
- 120
- Index after period 2
- 96
- Cumulative percentage change
- -4
How to interpret the output
Each change uses the preceding level as denominator. Missing periods and rebasing require separate handling. Source checked 10 November 2026.
Method reference