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Library to create Fan Charts as introduced by the Bank of England in 1996.

Project description


PyPI version PyPI license


The fanchart library provides functionality to create fan charts in Python.

The term fan chart was coined by the Bank of England in 1996. Since then, the BoE has used these charts to illustrate its forecasts for inflation.

The BoE introduced the fan charts aiming to communicate a more accurate representation of their forecast for medium term inflation. In particular, the charts have two key objectives:

  • To convey the uncertainty in their forecasts. This is, to focus attention on the forecast distribution, rather than only on small changes to the central projection.
  • To promote discussion of the risks to the economic outlook, and thus contribute to a wider debate about economic policy. Fan charts help to make it clear that monetary policy is about making decisions instead of knowing the exact rate of inflation in two years time.

For more details on the history of fan charts visit Fan Charts

Quick Start

This library provides two main functions

  • The fan function illustrates the distribution of all the forecasts available; and it has the option to display the historical values for reference.

  • The fan_single function illustrates the pdf/cdf of one forecast distribution

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