NPS calculator is a tool to calculate Net promoter score of any business/service.

Net Promoter Score helps understand customer satisfaction of any kind of business. It all starts by asking only one question to the customer which is "On a scale from 0 to 10, how likely are you to recommend this product/company to a friend or colleague?".

So, all the ratings as answers are accumulated from the customer and NPS is calculated by applying the formula:

  NPS = % Promoters - % Demoters

%Promoters: The percentage of customers who has given rating above 8.

%Demoters: The percentage of customers who has given rating below 7.

To calculate NPS, I have used a simple package from python which is numpy and a well known concept of Numpy arrays which is 'Masking'.

It hardly took 6-7 lines of code to calculate NPS. Below are the steps for calculating the same.

* Importing numpy library #Please install numpy if it is not installed.

* Loading ratings data from a text file.

* Calculating total number of customers.

* Calculating Promoters and Demoters percentages.

* Finally, putting everything in NPS formula.

Some insights which can be drawn from the NPS.

* If the NPS is below 30, then the business is not doing well and the services/products by the company are very poor.

* If the NPS is 50, then the business is doing good.

* If the NPS is 50+, then the business is doing extremely good and their customer satisfaction is very high.

Here is the link for the streamlit application which was developed to calculate NPS.

https://nps-calculator.onrender.com/

All you need to provide a text file with only ratings as shown in the sample.txt file.