How to round up in c#

Question

I want to round up always in c#, so for example, from 6.88 to 7, from 1.02 to 2, etc.

How can I do that?

possible duplicate of [how to always round up to the next integer](http://stackoverflow.com/questions/4846493/how-to-always-round-up-to-the-next-integer) — Talljoe, Apr 10 '11 at 17:32
Try to write Math. and look with enough attention to all the function you see — Felice Pollano, Apr 10 '11 at 17:33
yep, I googled, first on the list was this post... Thanks for asking. — Todd Painton, Feb 23 '15 at 18:48

score 164 · Accepted Answer · answered Apr 10 '11 at 17:24

164

Use Math.Ceiling()

double result = Math.Ceiling(1.02);

answered Apr 10 '11 at 17:24

BrokenGlass

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First one I saw. This is more clear than using awayfromzero. Thanks! – Scott Apr 10 '11 at 17:24
Clearer, and correct. :) `AwayFromZero` is used for something else, and would break for you in this case. – cHao Apr 10 '11 at 17:28
Is there an option that returns an `int` or `long` instead? – Kyle Delaney May 17 '17 at 19:01
@KyleDelaney no, but you can easily cast it via `(int) Math.Ceiling(someDouble);`. – henry.dv Oct 26 '18 at 09:19
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@henry.dv - I wonder why a rounding function would return a double to begin with – Kyle Delaney Oct 26 '18 at 16:06
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@KyleDelaney https://stackoverflow.com/questions/5693468/why-math-ceiling-returns-double – RedGreenCode Jan 02 '20 at 02:42

score 28 · Answer 2 · answered Apr 10 '11 at 17:23

28

Use Math.Ceiling: Math.Ceiling(value)

answered Apr 10 '11 at 17:23

Talljoe

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score 10 · Answer 3 · answered Dec 27 '20 at 04:35

If negative values are present, Math.Round has additional options (in .Net Core 3 or later).

I did a benchmark(.Net 5/release) though and Math.Ceiling() is faster and more efficient.

Math.Round( 6.88, MidpointRounding.ToPositiveInfinity) ==> 7   (~23 clock cycles)
Math.Round(-6.88, MidpointRounding.ToPositiveInfinity) ==> -6  (~23 clock cycles)

Math.Round( 6.88, MidpointRounding.AwayFromZero)       ==> 7   (~23 clock cycles)
Math.Round(-6.88, MidpointRounding.AwayFromZero)       ==> -7  (~23 clock cycles)

Math.Ceiling( 6.88)                                    ==> 7   (~1 clock cycles)
Math.Ceiling(-6.88)                                    ==> -6  (~1 clock cycles)

Math.Round has the advantage that it has the possibility to round to a given amount of decimals. While this is not possible with Math.Ceiling! — eKKiM, Apr 18 '22 at 09:45

How to round up in c#

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