How do I round to 2 decimal places?

Question

I have a number with a comma, for example: 254,5. I need the 0 behind the ,5 so it stands like 254,50 instead..

I'm using this to get the number:

Math.floor(iAlt / 50) * 50;

How can i get the 0 behind the ,5?

Not that your descreption of question makes much sense! IMHO — Baz1nga, Nov 22 '11 at 10:51
If you have difficulties expressing your question, you can always post code. Real and complete code. — Álvaro González, Nov 22 '11 at 10:51
@Baz1nga I've edited to make it clearer - great name by the way, Mr Cooper ;) — Rory McCrossan, Nov 22 '11 at 10:54

score 30 · Accepted Answer · answered Nov 22 '11 at 10:50

30

Try the toFixed() method, which pads the decimal value to length n with 0's.

var result = (Math.floor(iAlt / 50) * 50).toFixed(2);

A Number will always remove trailing zeros, so toFixed returns a String.

It's important to note that toFixed must be called on a number. Call parseFloat() or parseInt() to convert a string to a number first, if required (not in this situation, but for future reference).

answered Nov 22 '11 at 10:50

Matt

74,352
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2

Your solution does not seem to work. Instead, a simple .toFixed(2) does the trick nicely, it rounds up to two decimals (eg. 42.568 becomes 42.57 and 42.331 becomes 42.33). – Vasilis Lourdas Jan 21 '13 at 18:20
`var result = (Math.floor(iAlt * 50) / 50).toFixed(2);` – Swivel Jan 26 '13 at 21:33
@VasileiosLourdas The Question was a bit vague, but the asker wanted a solution that will turn 4.7 to 4.70 – hofnarwillie Jul 23 '13 at 16:37

How do I round to 2 decimal places?

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