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How to always round a number UP to the nearest penny in Javascript

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1

I have a bunch of numbers, for example 797.3333333333334, 852.22222111, 933.111023, which I want to ALWAYS round up to the nearest penny, such that the numbers I already mentioned would be 797.34, 852.23, 933.12, respectively.

I said the nearest penny, but you might also call it the nearest tenth.

There is a ceiling function, but that only rounds to the nearest integer, as does Math.round()

javascript

share|improve this question

edited Feb 24 '15 at 21:32

maudulus

asked Nov 22 '14 at 22:26

maudulusmaudulus

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• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  ceil doesn't round to nearest integer, it gets the first integer larger or equal to your number.
  
  – Cristy
  Nov 22 '14 at 22:28
  

  
  
  
  

add a comment | 

1

I have a bunch of numbers, for example 797.3333333333334, 852.22222111, 933.111023, which I want to ALWAYS round up to the nearest penny, such that the numbers I already mentioned would be 797.34, 852.23, 933.12, respectively.

I said the nearest penny, but you might also call it the nearest tenth.

There is a ceiling function, but that only rounds to the nearest integer, as does Math.round()

javascript

share|improve this question

edited Feb 24 '15 at 21:32

maudulus

asked Nov 22 '14 at 22:26

maudulusmaudulus

5,29555 gold badges4646 silver badges8383 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  ceil doesn't round to nearest integer, it gets the first integer larger or equal to your number.
  
  – Cristy
  Nov 22 '14 at 22:28
  

  
  
  
  

add a comment | 

I have a bunch of numbers, for example 797.3333333333334, 852.22222111, 933.111023, which I want to ALWAYS round up to the nearest penny, such that the numbers I already mentioned would be 797.34, 852.23, 933.12, respectively.

I said the nearest penny, but you might also call it the nearest tenth.

There is a ceiling function, but that only rounds to the nearest integer, as does Math.round()

javascript

share|improve this question

edited Feb 24 '15 at 21:32

maudulus

asked Nov 22 '14 at 22:26

maudulusmaudulus

5,29555 gold badges4646 silver badges8383 bronze badges

share|improve this question

edited Feb 24 '15 at 21:32

maudulus

asked Nov 22 '14 at 22:26

maudulusmaudulus

5,29555 gold badges4646 silver badges8383 bronze badges

share|improve this question

edited Feb 24 '15 at 21:32

maudulus

asked Nov 22 '14 at 22:26

maudulusmaudulus

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asked Nov 22 '14 at 22:26

maudulusmaudulus

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asked Nov 22 '14 at 22:26

maudulusmaudulus

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3 Answers
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7

The Math.ceil(x) function returns the smallest integer greater than or equal to a number "x".

var rounded = Math.ceil(yourNumber * 100)/100;

share|improve this answer

answered Nov 22 '14 at 22:29

hereandnow78hereandnow78

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add a comment | 

1

Just do it like this: Math.ceil(number * 100) / 100.

share|improve this answer

answered Nov 22 '14 at 22:30

MouagipMouagip

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add a comment | 

0

Properly rounding to the nearest penny:

var yourNumber = 5.495;
yourNumber = Math.round(yourNumber * 100)/100;
alert(yourNumber);

Always round up to the nearest penny:

function precision(a) 
 if (!isFinite(a)) return 0;
 var e = 1, p = 0;
 while (Math.round(a * e) / e !== a) 
 e *= 10; p++; 
 
 return p;

if (precision(yourNumber) >= 3) 
 yourNumber = (Math.trunc(yourNumber * 100)/100) * 1 + 0.01;

share|improve this answer

edited Mar 26 at 6:57

maudulus

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answered Mar 26 at 3:22

Super-WhyDoYouWantToDoThat-ManSuper-WhyDoYouWantToDoThat-Man

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• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  maudulus, Do you have any resources on how to manage garbage collection in html5 canvas?
  
  – Super-WhyDoYouWantToDoThat-Man
  Mar 26 at 14:03
  

  
  
  
  

add a comment | 

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7

The Math.ceil(x) function returns the smallest integer greater than or equal to a number "x".

var rounded = Math.ceil(yourNumber * 100)/100;

share|improve this answer

answered Nov 22 '14 at 22:29

hereandnow78hereandnow78

10.4k66 gold badges3636 silver badges4747 bronze badges

add a comment | 

7

The Math.ceil(x) function returns the smallest integer greater than or equal to a number "x".

var rounded = Math.ceil(yourNumber * 100)/100;

share|improve this answer

answered Nov 22 '14 at 22:29

hereandnow78hereandnow78

10.4k66 gold badges3636 silver badges4747 bronze badges

add a comment | 

The Math.ceil(x) function returns the smallest integer greater than or equal to a number "x".

var rounded = Math.ceil(yourNumber * 100)/100;

share|improve this answer

answered Nov 22 '14 at 22:29

hereandnow78hereandnow78

10.4k66 gold badges3636 silver badges4747 bronze badges

var rounded = Math.ceil(yourNumber * 100)/100;

share|improve this answer

answered Nov 22 '14 at 22:29

hereandnow78hereandnow78

10.4k66 gold badges3636 silver badges4747 bronze badges

answered Nov 22 '14 at 22:29

hereandnow78hereandnow78

10.4k66 gold badges3636 silver badges4747 bronze badges

answered Nov 22 '14 at 22:29

hereandnow78hereandnow78

10.4k66 gold badges3636 silver badges4747 bronze badges

1

Just do it like this: Math.ceil(number * 100) / 100.

share|improve this answer

answered Nov 22 '14 at 22:30

MouagipMouagip

3,36022 gold badges2626 silver badges4545 bronze badges

add a comment | 

1

Just do it like this: Math.ceil(number * 100) / 100.

share|improve this answer

answered Nov 22 '14 at 22:30

MouagipMouagip

3,36022 gold badges2626 silver badges4545 bronze badges

add a comment | 

Just do it like this: Math.ceil(number * 100) / 100.

share|improve this answer

answered Nov 22 '14 at 22:30

MouagipMouagip

3,36022 gold badges2626 silver badges4545 bronze badges

share|improve this answer

answered Nov 22 '14 at 22:30

MouagipMouagip

3,36022 gold badges2626 silver badges4545 bronze badges

answered Nov 22 '14 at 22:30

MouagipMouagip

3,36022 gold badges2626 silver badges4545 bronze badges

answered Nov 22 '14 at 22:30

MouagipMouagip

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0

Properly rounding to the nearest penny:

var yourNumber = 5.495;
yourNumber = Math.round(yourNumber * 100)/100;
alert(yourNumber);

Always round up to the nearest penny:

function precision(a) 
 if (!isFinite(a)) return 0;
 var e = 1, p = 0;
 while (Math.round(a * e) / e !== a) 
 e *= 10; p++; 
 
 return p;

if (precision(yourNumber) >= 3) 
 yourNumber = (Math.trunc(yourNumber * 100)/100) * 1 + 0.01;

share|improve this answer

edited Mar 26 at 6:57

maudulus

5,29555 gold badges4646 silver badges8383 bronze badges

answered Mar 26 at 3:22

Super-WhyDoYouWantToDoThat-ManSuper-WhyDoYouWantToDoThat-Man

3655 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  maudulus, Do you have any resources on how to manage garbage collection in html5 canvas?
  
  – Super-WhyDoYouWantToDoThat-Man
  Mar 26 at 14:03
  

  
  
  
  

add a comment | 

0

Properly rounding to the nearest penny:

var yourNumber = 5.495;
yourNumber = Math.round(yourNumber * 100)/100;
alert(yourNumber);

Always round up to the nearest penny:

function precision(a) 
 if (!isFinite(a)) return 0;
 var e = 1, p = 0;
 while (Math.round(a * e) / e !== a) 
 e *= 10; p++; 
 
 return p;

if (precision(yourNumber) >= 3) 
 yourNumber = (Math.trunc(yourNumber * 100)/100) * 1 + 0.01;

share|improve this answer

edited Mar 26 at 6:57

maudulus

5,29555 gold badges4646 silver badges8383 bronze badges

answered Mar 26 at 3:22

Super-WhyDoYouWantToDoThat-ManSuper-WhyDoYouWantToDoThat-Man

3655 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  maudulus, Do you have any resources on how to manage garbage collection in html5 canvas?
  
  – Super-WhyDoYouWantToDoThat-Man
  Mar 26 at 14:03
  

  
  
  
  

add a comment | 

Properly rounding to the nearest penny:

var yourNumber = 5.495;
yourNumber = Math.round(yourNumber * 100)/100;
alert(yourNumber);

Always round up to the nearest penny:

function precision(a) 
 if (!isFinite(a)) return 0;
 var e = 1, p = 0;
 while (Math.round(a * e) / e !== a) 
 e *= 10; p++; 
 
 return p;

if (precision(yourNumber) >= 3) 
 yourNumber = (Math.trunc(yourNumber * 100)/100) * 1 + 0.01;

share|improve this answer

edited Mar 26 at 6:57

maudulus

5,29555 gold badges4646 silver badges8383 bronze badges

answered Mar 26 at 3:22

Super-WhyDoYouWantToDoThat-ManSuper-WhyDoYouWantToDoThat-Man

3655 bronze badges

var yourNumber = 5.495;
yourNumber = Math.round(yourNumber * 100)/100;
alert(yourNumber);

function precision(a) 
 if (!isFinite(a)) return 0;
 var e = 1, p = 0;
 while (Math.round(a * e) / e !== a) 
 e *= 10; p++; 
 
 return p;

if (precision(yourNumber) >= 3) 
 yourNumber = (Math.trunc(yourNumber * 100)/100) * 1 + 0.01;

share|improve this answer

edited Mar 26 at 6:57

maudulus

5,29555 gold badges4646 silver badges8383 bronze badges

answered Mar 26 at 3:22

Super-WhyDoYouWantToDoThat-ManSuper-WhyDoYouWantToDoThat-Man

3655 bronze badges

edited Mar 26 at 6:57

maudulus

5,29555 gold badges4646 silver badges8383 bronze badges

edited Mar 26 at 6:57

maudulus

5,29555 gold badges4646 silver badges8383 bronze badges

answered Mar 26 at 3:22

Super-WhyDoYouWantToDoThat-ManSuper-WhyDoYouWantToDoThat-Man

3655 bronze badges

answered Mar 26 at 3:22

Super-WhyDoYouWantToDoThat-ManSuper-WhyDoYouWantToDoThat-Man

3655 bronze badges