Skip to content
Related Articles

Related Articles

How to calculate the Percentage of a column in Pandas ?
  • Last Updated : 28 Jul, 2020

A Percentage is calculated by the mathematical formula of dividing the value by the sum of all the values and then multiplying the sum by 100. This is also applicable in Pandas Dataframes. Here, the pre-defined sum() method of pandas series is used to compute the sum of all the values of a column.

Syntax: Series.sum()

Return: Returns the sum of the values.

Formula: 

df[percent] = (df['column_name'] / df['column_name'].sum()) * 100

Example 1: 



Python3

filter_none

edit
close

play_arrow

link
brightness_4
code

# Import required libraries
import pandas as pd
import numpy as np
   
# Dictionary
df1 = {
     'Name': ['abc', 'bcd', 'cde',
             'def', 'efg', 'fgh',
             'ghi'],
     'Math_score': [52, 87, 49,
                   74, 28, 59,
                   48]}
   
# Create a DataFrame
df1 = pd.DataFrame(df1, 
                   columns = ['Name',
                             'Math_score'])
  
# Calculating Percentage
df1['percent'] = (df1['Math_score'] / 
                  df1['Math_score'].sum()) * 100
  
# Show the dataframe
df1

chevron_right


Output: 
 

Dataframe with percentage

Example 2: 

Python3

filter_none

edit
close

play_arrow

link
brightness_4
code

# Import pandas library
import pandas as pd
   
# Dictionary
df1 = {
     'Name': ['abc', 'bcd', 'cde',
             'def', 'efg', 'fgh',
             'ghi'],
      'Math_score': [52, 87, 49,
                    74, 28, 59,
                    48],
       'Eng_score': [34, 67, 25
                    89, 92, 45,
                    86]
}
   
# Create a DataFrame
df1 = pd.DataFrame(df1, 
                   columns = ['Name',
                   'Math_score','Eng_score'])
  
# Calculate Percentage
df1['Eng_percent'] = (df1['Eng_score'] / 
                      df1['Eng_score'].sum()) * 100
# Show the dataframe
df1

chevron_right


Output: 
 

Dataframe with percentage-2

Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course.

My Personal Notes arrow_drop_up
Recommended Articles
Page :