Round Number up to 2 decimal places in Python

Rounding up numbers is the most common use case in any programming language that a developer has to deal with.

If you are new to Python Programming and looking for ways to convert a float value with 2 decimal precision, below are various ways to achieve it.

Option 1: using built-in round() function

Syntax:

round(number[, ndigits])

Example:

number = 99.981234
rounded_number = round(number, 2)
print(rounded_number)

Output:

99.98

Documentation:

Built-in round() function: https://docs.python.org/2/library/functions.html#round



Note: The behavior of round() for floats can be surprising: for example, round(2.675, 2) gives 2.67 instead of the expected 2.68. This is not a bug: it’s a result of the fact that most decimal fractions can’t be represented exactly as a float.

Read: Floating Point Arithmetic: Issues and Limitations

Option 2: using String formatting

Example:

number = 23.10124
formatted_number = "{:.2f}".format(number)
print(formatted_number)

Output:

22.10

Read more:

https://docs.python.org/3/library/stdtypes.html#str.format

Option 3: using f-string (Python 3.6+)

Example:

number = 13.1234
formatted_number = f"{number:.2f}"
print(formatted_number)

Output:

13.12

Read More:
https://docs.python.org/3/reference/lexical_analysis.html#f-strings

Option 4: using decimal module

Example:

from decimal import Decimal

number = Decimal('11.1234')
rounded_number = round(number, 2)
print(rounded_number)

Output:

11.12

Read More:
https://docs.python.org/3/library/decimal.html

Option 5: using numpy module

Example:

import numpy as np

number = 299.1415
rounded_number = np.round(number, 2)
print(rounded_number)

Output:

299.14

Read More:
https://numpy.org

Option 6: using math module

Example:

import math

number = 19.18192243
rounded_number = math.floor(number * 100) / 100
print(rounded_number) 

Output:

19.18

Read More:
https://docs.python.org/3.8/library/math.html

I have added the links to the official documentation for each example so you can visit and get more details.

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