All integers that can be represented by floating point numbers have an exact representation. So you can safely use int on the result. Inexact representations occur only if you are trying to represent a rational number with a denominator that is not a power of two.
That this works is not trivial at all! It's a property of the IEEE floating point representation that int∘floor = ⌊⋅⌋ if the magnitude of the numbers in question is small enough, but different representations are possible where int(floor(2.3)) might be 1.
To quote from Wikipedia,
Answer from Philipp on Stack OverflowAny integer with absolute value less than or equal to 224 can be exactly represented in the single precision format, and any integer with absolute value less than or equal to 253 can be exactly represented in the double precision format.
Top answer 1 of 9
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All integers that can be represented by floating point numbers have an exact representation. So you can safely use int on the result. Inexact representations occur only if you are trying to represent a rational number with a denominator that is not a power of two.
That this works is not trivial at all! It's a property of the IEEE floating point representation that int∘floor = ⌊⋅⌋ if the magnitude of the numbers in question is small enough, but different representations are possible where int(floor(2.3)) might be 1.
To quote from Wikipedia,
Any integer with absolute value less than or equal to 224 can be exactly represented in the single precision format, and any integer with absolute value less than or equal to 253 can be exactly represented in the double precision format.
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Use int(your non integer number) will nail it.
print int(2.3) # "2"
print int(math.sqrt(5)) # "2"
GeeksforGeeks
geeksforgeeks.org › python › how-to-convert-float-to-int-in-python
How to convert Float to Int in Python? - GeeksforGeeks
May 10, 2025 - Let's explore different methods of doing it in Python: To convert a float value to int we make use of the built-in int() function, this function trims the values after the decimal point and returns only the integer/whole number part.
Float and int function
float() and int() are mainly use to convert strings to numbers. They actually create a number from the strings. int() is also often use to create an integer number from a float number. A classic example is when you ask the user for a number. The input function always returns a string of character. To perform calculation you need a number (int or float). So you must create a number from that string. As in: string_number = input("Enter temperature in °F (integer): ") temp_far = int(string_number) temp_cel = (temp_far-32) * (5/9) # the result here is a float print("Temperature in celsius (float)", temp_cel) temp_cel_int = int(temp_cel) # creates an integer number from the float print("Temperature in Celsius (integer)", temp_cel_int) Using float on strings from math import radians angle_string = input("Enter a precise angle in degrees with decimal: ") angle_float = float(angle_string) radians_float = radians(angle_float) print("That angle in degrees is",radians_float,"in radians") More on reddit.com
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March 25, 2023How to convert float to int in program
All of the if & elifs are not necessary if stars < 1: print(movie," *") elif stars > 5: print(movie," *****") else: print(movie, "*" * stars) More on reddit.com
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September 18, 2023floating point - Python float to int conversion - Stack Overflow
Basically, I'm converting a float to an int, but I don't always have the expected value. Here's the code I'm executing: x = 2.51 print("--------- 251.0") y = 251.0 print(y) print(int(y)) print( More on stackoverflow.com
Converting large int value to float and back to int messes up the value?
There's a long-winded and very technical explanation about how floats and ints are implemented and why this happens for those numbers, but the reason why it must happen for some numbers is pretty simple: Python ints are unbounded, which means there are infinitely many ints you can have in Python. Python floats are 64-bit numbers, which means there are only 2^64 of them. Since there aren't infinitely many floats, you can't make int -> float -> int work for all numbers. The technical explanation is that ints are stored as a list of digits (essentially), so it can be as long as you want, but floats are basically a fraction, stored as a triple of numbers (s,p,q) each of a fixed-size and the numeric value of the float is (-1)^s*q*2^p. If this doesn't make sense, read up on "double-precision floating point" https://en.wikipedia.org/wiki/Double-precision_floating-point_format . The consequence of this is that floats can store very small and very large numbers, but there's a lot of gaps in between, and if your int falls in one of those gaps then when you turn it into a float with float() it picks the "nearest" one instead, so when you turn it back to an int you get the wrong value. More on reddit.com
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February 22, 2024How To Convert Integer To Float In Python
Python Top 200 Code Snippets – Part 14 – How to Convert ...
00:36
Float to Int: Convert Numbers Easily! #shorts - YouTube
00:23
Float to Int Conversion: Simple Guide for Beginners #shorts - YouTube
How to convert the integer to float in Python - YouTube
Medium
medium.com › @ryan_forrester_ › converting-floats-to-integers-in-python-a-complete-guide-9ec8c994327d
Converting Floats to Integers in Python: A Complete Guide | by ryan | Medium
November 4, 2024 - Args: readings: List of float readings resolution: Sensor resolution (minimum meaningful change) Returns: List of processed integer readings """ processed = [] for reading in readings: # First round to the sensor's resolution rounded = round(reading / resolution) * resolution # Then convert to integer if needed processed.append(int(rounded)) return processed # Example with temperature readings temperature_readings = [ 22.4, 22.6, 22.3, 22.7, 22.5, # Regular readings 22.51, 22.49, # Close readings float('nan'), # Error reading 23.0 # Exact reading ] # Process with different resolutions resolutions = [0.5, 1.0] for res in resolutions: print(f"\nProcessing with resolution: {res}°C") try: processed = process_sensor_readings(temperature_readings, res) print(f"Original: {temperature_readings}") print(f"Processed: {processed}") except Exception as e: print(f"Error: {e}")
Manifoldapp
cuny.manifoldapp.org › read › how-to-code-in-python-3 › section › 517db09e-e5a2-4b02-bd3d-d5406a3b40a8
How To Convert Data Types | How To Code in Python 3 | Manifold @CUNY
By using the float() function, we can convert integers to floats. Python also has a built-in function to convert floats to integers: int().
Python Guides
pythonguides.com › convert-float-to-int-python
How to Convert Float to Int in Python?
March 20, 2025 - Let us learn how to convert float to int in Python using various methods with examples. ... The most simple way to convert a float to an integer in Python is by using the built-in int() function.
Scaler
scaler.com › home › topics › convert float to int in python
Program to Convert Float to Int Python - Scaler Topics
August 22, 2023 - We can convert a float value to an int using Type conversion in Python. Type Conversion is an explicit way of changing an operand to a certain type. Python comes with a few in-built methods to achieve this. Displaying a floating value as a number or a percentage is a frequent application for converting a float to an integer.
FavTutor
favtutor.com › blogs › float-to-int-python
Python Program to Convert Float to Int | FavTutor
February 22, 2022 - Learn how to convert float to integer in python using math.floor(), int() and NumPy library.
DEV Community
dev.to › mathewchan › python-syntax-learning-1-convert-float-to-int-1587
Python syntax learning 1: Convert float to int - DEV Community
June 3, 2022 - int() is the most flexible way to convert float object to integer, but will suffer from data lose, same as meth.trunc(). math.floor() and math.celi() can minimize data lose in the conversion if use properly.
365 Data Science
365datascience.com › blog › tutorials › python tutorials › how to convert float to int in python
How to Convert Float to Int in Python – 365 Data Science
April 21, 2023 - However, you should use this technique with caution, as all floating-point numbers are rounded down to the nearest integer by default: ... Instead of using casting to convert float to int, we can apply round() to a value or variable and it automatically rounds up or down the number: >>> round(1.1) 1 >>> round(1.9) 2 >>> round(1.5) # values in center are rounded up 2 · This is useful for mathematical operations as you would not want to obtain the incorrect answer just because of rounding errors. You can control which way Python rounds your floating points.
Reddit
reddit.com › r/learnpython › float and int function
r/learnpython on Reddit: Float and int function
March 25, 2023 -
Hello, please can someone explain to me when to use the float and int functions?
I mean should I use float when I am strictly dealing with decimal numbers, or when I want to convert whole numbers to decimal numbers?
pythonlearner
Top answer 1 of 4
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float() and int() are mainly use to convert strings to numbers. They actually create a number from the strings. int() is also often use to create an integer number from a float number. A classic example is when you ask the user for a number. The input function always returns a string of character. To perform calculation you need a number (int or float). So you must create a number from that string. As in: string_number = input("Enter temperature in °F (integer): ") temp_far = int(string_number) temp_cel = (temp_far-32) * (5/9) # the result here is a float print("Temperature in celsius (float)", temp_cel) temp_cel_int = int(temp_cel) # creates an integer number from the float print("Temperature in Celsius (integer)", temp_cel_int) Using float on strings from math import radians angle_string = input("Enter a precise angle in degrees with decimal: ") angle_float = float(angle_string) radians_float = radians(angle_float) print("That angle in degrees is",radians_float,"in radians")
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For string conversion, use the one appropriate to the string you're trying to convert. If you care about exact equality, don't use floats. Use integers, or maybe the Decimal class. If you want to know if floats are equal ish, keep in mind that the ish is always there. Use something like math.isclose to make such checks. There is rarely (almost never?) any need to explicitly convert integers to floats (unless you're doing something with numpy or similar). Integers will be automatically treated as floats during division (NOTE: different in some other languages), multiplication, etc. If you want to convert a float to integer, you can do that via int(2.3), but keep in mind how it rounds. There are other rounding functions that may or may not be more helpful (math.ceil, math.floor, round).
Flexiple
flexiple.com › python › float-to-int-python
How to convert Float to int in Python? | Flexiple Tutorials | Python - Flexiple
March 11, 2022 - Apart from all this, when it comes to the efficiency of calculations, integer values are always preferred. This method of converting float to int in Python uses the int() method to convert float to int.
Altcademy
altcademy.com › blog › how-to-convert-float-to-int-in-python
How to convert float to int in Python - Altcademy.com
September 7, 2023 - In this code, round(x) rounds the float x to the nearest whole number (4 in this case), and then int() converts that rounded float to an integer. It's like if you're 3.99 steps up a staircase, rounding would say you're closer to the 4th step ...
Reddit
reddit.com › r/learnpython › how to convert float to int in program
r/learnpython on Reddit: How to convert float to int in program
September 18, 2023 -
I created this program and was wondering that if someone were to input a decimal (ex: 1.5) for a rating, it would round down to 1 and show the correct number of starts. here's my code.
movie = input("Enter a movie: ")
stars = int(input("Rate between 1 and 5: "))
if stars == 1:
print(movie," *")
elif stars == 2:
print(movie," **")
elif stars == 3:
print(movie," ***")
elif stars == 4:
print(movie," ****")
elif stars == 5:
print(movie," *****")
if stars < 1:
print(movie," *")
elif stars > 5:
print(movie," *****")
Python Tutorial
pythontutorial.net › home › advanced python › python float to int
How To Convert a Float to an Int in Python
February 20, 2021 - In this tutorial, you'll learn how to convert a float to an integer using the truncation, floor, ceiling functions.
Javatpoint
javatpoint.com › how-to-convert-float-to-int-in-python
How to Convert float to int in Python - Javatpoint
How to Convert float to int in Python with python, tutorial, tkinter, button, overview, entry, checkbutton, canvas, frame, environment set-up, first python program, operators, etc.
Delft Stack
delftstack.com › home › howto › python › convert floating point number to integer in python
How to Convert Floating-Point Number to an Integer in Python | Delft Stack
February 2, 2024 - The int() function accepts an argument representing a number and converts it to an integer. This argument can be a string, a float value, or an integer itself.
DataCamp
datacamp.com › tutorial › python-data-type-conversion
Python Data Type Conversion: A Guide With Examples | DataCamp
February 16, 2025 - It is commonly used when the automatic (implicit) conversion provided by Python doesn’t meet your requirements. ... Note: While explicit conversions are highly useful, they can lead to information loss. For instance, converting a floating-point number to an integer will discard its fractional part.
Stack Overflow
stackoverflow.com › questions › 6569528 › python-float-to-int-conversion
floating point - Python float to int conversion - Stack Overflow
Basically, I'm converting a float to an int, but I don't always have the expected value. Here's the code I'm executing: x = 2.51 print("--------- 251.0") y = 251.0 print(y) print(int(y)) print(...
Pyschool
pyschool.ai › home › curriculum › convert float to integer
Convert Float to Integer Python Practice Lesson | PySchool.ai
January 2, 2026 - Convert a floating-point number to an integer by truncating the fractional part. ... Given a single floating-point number, return its integer conversion using Python's default behavior: drop the fractional part (truncate toward zero).
GeeksforGeeks
geeksforgeeks.org › python › convert-floats-to-integers-in-a-pandas-dataframe
Convert Floats to Integers in a Pandas DataFrame - GeeksforGeeks
July 15, 2025 - Below are the ways by which we can convert floats to integers in a Pandas DataFrame: Using DataFrame.astype() method · Using DataFrame.apply() method · First of all, we will create a DataFrame · Python3 ·