Math.ceil() - JavaScript | MDN - Mozilla

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Math.ceil() Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨July 2015⁩.

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The Math.ceil() static method always rounds up and returns the smallest integer greater than or equal to a given number.

In this article

  • Try it
  • Syntax
  • Description
  • Examples
  • Specifications
  • Browser compatibility
  • See also

Try it

console.log(Math.ceil(0.95)); // Expected output: 1 console.log(Math.ceil(4)); // Expected output: 4 console.log(Math.ceil(7.004)); // Expected output: 8 console.log(Math.ceil(-7.004)); // Expected output: -7

Syntax

jsMath.ceil(x)

Parameters

x

A number.

Return value

The smallest integer greater than or equal to x. It's the same value as -Math.floor(-x).

Description

Because ceil() is a static method of Math, you always use it as Math.ceil(), rather than as a method of a Math object you created (Math is not a constructor).

Examples

Using Math.ceil()

jsMath.ceil(-Infinity); // -Infinity Math.ceil(-7.004); // -7 Math.ceil(-4); // -4 Math.ceil(-0.95); // -0 Math.ceil(-0); // -0 Math.ceil(0); // 0 Math.ceil(0.95); // 1 Math.ceil(4); // 4 Math.ceil(7.004); // 8 Math.ceil(Infinity); // Infinity

Specifications

Specification
ECMAScript® 2026 Language Specification# sec-math.ceil

Browser compatibility

See also

  • Math.abs()
  • Math.floor()
  • Math.round()
  • Math.sign()
  • Math.trunc()

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This page was last modified on ⁨Jul 10, 2025⁩ by MDN contributors.

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  1. Standard built-in objects
  2. Math
  3. Static methods
    1. abs()
    2. acos()
    3. acosh()
    4. asin()
    5. asinh()
    6. atan()
    7. atan2()
    8. atanh()
    9. cbrt()
    10. ceil()
    11. clz32()
    12. cos()
    13. cosh()
    14. exp()
    15. expm1()
    16. f16round()
    17. floor()
    18. fround()
    19. hypot()
    20. imul()
    21. log()
    22. log1p()
    23. log2()
    24. log10()
    25. max()
    26. min()
    27. pow()
    28. random()
    29. round()
    30. sign()
    31. sin()
    32. sinh()
    33. sqrt()
    34. sumPrecise()
    35. tan()
    36. tanh()
    37. trunc()
  4. Static properties
    1. E
    2. LN2
    3. LN10
    4. LOG2E
    5. LOG10E
    6. PI
    7. SQRT1_2
    8. SQRT2

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