As pointed out by other answers, in python they return floats probably because of historical reasons to prevent overflow problems. However, they return integers in python 3.
>>> import math
>>> type(math.floor(3.1))
<class 'int'>
>>> type(math.ceil(3.1))
<class 'int'>
You can find more information in PEP 3141.
Answer from jcollado on Stack OverflowW3Schools
w3schools.com › python › ref_math_ceil.asp
Python math.ceil() Method
The math.ceil() method rounds a number UP to the nearest integer, if necessary, and returns the result.
Python
docs.python.org › 3 › library › math.html
math — Mathematical functions
2 weeks ago - Return the ceiling of x, the smallest integer greater than or equal to x.
Why do Python's math.ceil() and math.floor() operations return floats instead of integers? - Stack Overflow
Ironically (as floats were used ... by floor/ceil is meaningless in the low digits because of the float representation, well before a 64 bits int would overflow. [This wasn't true in the old days of 32 bits.] ... As pointed out by other answers, in python they return floats probably because of historical reasons to prevent overflow problems. However, they return integers in python 3. >>> import math >>> ... More on stackoverflow.com
what is the difference between using math.ceil and round for rounding the decimal ?
ceil always rounds up. More on reddit.com
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October 10, 2022how to use math.ceil in both python 2 and 3 to get the int number?
You can cast an int to an int, so int(math.ceil()) should return the same on 2 and 3. More on reddit.com
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March 21, 2018Python math.ceil BUG in leetcode
Did the same mistake in one of my onsites 😂. Don’t know how ceil works in python. In java we need to explicitly typecast it to double while calling ceil. 3/6 goes as integer division, math.ceil(3/6) is basically math.ceil(0), so it’s returning 0.0. While Math.ceil(3/(double)6) return 1.0. More on reddit.com
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January 16, 2025Videos
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GeeksforGeeks
geeksforgeeks.org › python › floor-ceil-function-python
floor() and ceil() function Python - GeeksforGeeks
ceil(): Rounds a number up to the nearest integer. Example: ceil() of 3.3 will be 4. Note: Both functions require importing the math module: import math
Published January 16, 2026
STEMpedia
ai.thestempedia.com › home › python functions › math.ceil()
Learn Python math.ceil() Function | Python Programming Tutorial
June 27, 2023 - In Python, the math.ceil() function is used to return the ceiling value of a number, which means it is used to round a number up to the nearest integer that is greater than the number itself.
Top answer 1 of 9
121
As pointed out by other answers, in python they return floats probably because of historical reasons to prevent overflow problems. However, they return integers in python 3.
>>> import math
>>> type(math.floor(3.1))
<class 'int'>
>>> type(math.ceil(3.1))
<class 'int'>
You can find more information in PEP 3141.
2 of 9
108
The range of floating point numbers usually exceeds the range of integers. By returning a floating point value, the functions can return a sensible value for input values that lie outside the representable range of integers.
Consider: If floor() returned an integer, what should floor(1.0e30) return?
Now, while Python's integers are now arbitrary precision, it wasn't always this way. The standard library functions are thin wrappers around the equivalent C library functions.
VisuAlgo
visualgo.net › en › sorting
Sorting (Bubble, Selection, Insertion, Merge, Quick, Counting, Radix) - VisuAlgo
You need to already understand/remember all these: -. Logarithm and Exponentiation, e.g., log2(1024) = 10, 210 = 1024 -. Arithmetic progression, e.g., 1+2+3+4+…+10 = 10*11/2 = 55 -. Geometric progression, e.g., 1+2+4+8+..+1024 = 1*(1-211)/(1-2) = 2047 -. Linear/Quadratic/Cubic function, e.g., f1(x) = x+2, f2(x) = x2+x-1, f3(x) = x3+2x2-x+7 -. Ceiling, Floor, and Absolute function, e.g., ceil(3.1) = 4, floor(3.1) = 3, abs(-7) = 7
TikTok
tiktok.com › discover › how-to-use-math-ceil-in-python
How to Use Math Ceil in Python
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Lodash
lodash.com › docs
Lodash Documentation
_.ceil · _.divide · _.floor · _.max · _.maxBy · _.mean · _.meanBy · _.min · _.minBy · _.multiply · _.round · _.subtract · _.sum · _.sumBy · _.clamp · _.inRange · _.random · _.assign · _.assignIn · _.assignInWith · _.assignWith · _.at · _.create ·
GitHub
github.com › TheAlgorithms › Python › blob › master › maths › ceil.py
Python/maths/ceil.py at master · TheAlgorithms/Python
Return the ceiling of x as an Integral. · :param x: the number · :return: the smallest integer >= x. · >>> import math · >>> all(ceil(n) == math.ceil(n) for n · ... in (1, -1, 0, -0, 1.1, -1.1, 1.0, -1.0, 1_000_000_000)) True ·
Author TheAlgorithms
Scaler
scaler.com › home › topics › python math.ceil() method
Python math.ceil() Method - Scaler Topics
November 29, 2023 - It is equivalent to the Least integer function in mathematics. Ceil in python precisely rounds up floating-point numbers to the nearest integer, which is crucial for maintaining precision in mathematical operations.
GeeksforGeeks
geeksforgeeks.org › python › python-math-ceil-function
math.ceil() function - Python - GeeksforGeeks
November 17, 2025 - Explanation: math.ceil(-13.1) returns -13 because it is the smallest integer greater than or equal to -13.1.
Python documentation
docs.python.org › 3 › reference › datamodel.html
3. Data model — Python 3.14.3 documentation
A built-in function object is a wrapper around a C function. Examples of built-in functions are len() and math.sin() (math is a standard built-in module). The number and type of the arguments are determined by the C function.
Python Guides
pythonguides.com › ceil-function-in-python
How To Use The Ceil() Function In Python?
March 19, 2025 - The ceil function in Python is used to return the smallest integer greater than or equal to a given number. This is particularly useful in scenarios where you need to round up numbers to avoid underestimating values. The function is defined in the math module, so you need to import this module ...
Codecademy
codecademy.com › docs › python:numpy › math methods › .ceil()
Python:NumPy | Math Methods | .ceil() | Codecademy
June 13, 2025 - The .ceil() function returns a NumPy array with the smallest integers greater than or equal to each element in x, returned as floats.
Trymito
trymito.io › excel-to-python › functions › math › CEIL
Excel to Python: CEIL Function - A Complete Guide | Mito
Math · CEIL · Related FunctionsFLOORROUND · The CEIL function in Excel rounds a number up to the nearest integer. This function is crucial in scenarios where precision to the nearest whole number is required, like in inventory management ...
Nim Programming Language
nim-lang.org
Nim Programming Language
import std/math # Basic math. assert 1 + 2 == 3 # Sum assert 4 - 1 == 3 # Subtraction assert 2 * 2 == 4 # Multiplication assert 4 / 2 == 2.0 # Division assert 4 div 2 == 2 # Integer Division assert 2 ^ 3 == 8 # Power assert 4 mod 2 == 0 # Modulo assert (2 xor 4) == 6 # XOR assert (4 shr 2) == 1 # Shift Right assert PI * 2 == TAU # PI and TAU assert sqrt(4.0) == 2.0 # Square Root assert round(3.5) == 4.0 # Round assert isPowerOfTwo(16) # Powers of Two assert floor(2.9) == 2.0 # Floor assert ceil(2.9) == 3.0 # Ceil assert cos(TAU) == 1.0 # Cosine assert gcd(12, 8) == 4 # Greatest common divisor assert trunc(1.75) == 1.0 # Truncate assert floorMod(8, 3) == 2 # Floor Modulo assert floorDiv(8, 3) == 2 # Floor Division assert hypot(4.0, 3.0) == 5.0 # Hypotenuse assert gamma(4.0) == 6.0 # Gamma function assert radToDeg(TAU) == 360.0 # Radians to Degrees assert clamp(1.4, 0.0 ..
Reddit
reddit.com › r/learnpython › how to use math.ceil in both python 2 and 3 to get the int number?
r/learnpython on Reddit: how to use math.ceil in both python 2 and 3 to get the int number?
March 21, 2018 -
in python 2, math.ceil returns float, but I need it returns int, and I also want my code run correctly in python2 and 3. Currently , I define my own ceil function like this
def ceil(float_num):
import sys
if sys.version[0] == '2':
from math import ceil as ceiling
return int(ceiling(float_num))
elif sys.version[0] == '3':
from math import ceil
return ceil(float_num)I am just wondering is there any better solution? just like from __future__ import devision?
CodeChef
codechef.com › roadmap › python-dsa
Python DSA Roadmap – Learn Data Structures & Algorithms
Begin your Python coding journey with this step-by-step DSA roadmap. You'll start by mastering fundamentals like arrays, stacks, and recursion before advancing to trees, graphs, and dynamic programming—all in Python. With over 450 hands-on challenges, this roadmap ensures you reinforce key ...
Note.nkmk.me
note.nkmk.me › home › python
Round Up/Down Decimals in Python: math.floor, math.ceil
January 15, 2024 - math.ceil(x) returns the ceiling of x, the smallest integer greater than or equal to x.