---
title: Math.round()
slug: Web/JavaScript/Reference/Global_Objects/Math/round
translation_of: Web/JavaScript/Reference/Global_Objects/Math/round
---
<div>{{JSRef}}</div>

<p><strong><code>Math.round()</code></strong> 함수는 입력값을 반올림한 수와 가장 가까운 정수 값을 반환합니다.</p>

<div>{{EmbedInteractiveExample("pages/js/math-round.html")}}</div>



<h2 id="문법">문법</h2>

<pre class="syntaxbox">Math.round(<var>x</var>)</pre>

<h3 id="매개_변수">매개 변수</h3>

<dl>
 <dt><code>x</code></dt>
 <dd>수</dd>
</dl>

<h3 id="반환_값">반환 값</h3>

<p>입력값을 반올림한 값과 가장 가까운 정수를 의미합니다.</p>

<h2 id="Description">Description</h2>

<p>If the fractional portion of the argument is greater than 0.5, the argument is rounded to the integer with the next higher absolute value. If it is less than 0.5, the argument is rounded to the integer with the lower absolute value.  If the fractional portion is exactly 0.5, the argument is rounded to the next integer in the direction of +∞.  <strong>Note that this differs from many languages' <code>round()</code> functions, which often round this case to the next integer <em>away from zero</em></strong>, instead giving a different result in the case of negative numbers with a fractional part of exactly 0.5.</p>

<p>Because <code>round()</code> is a static method of <code>Math</code>, you always use it as <code>Math.round()</code>, rather than as a method of a <code>Math</code> object you created (<code>Math</code> has no constructor).</p>

<h2 id="Examples">Examples</h2>

<pre class="brush: js">Math.round( 20.49); //  20
Math.round( 20.5 ); //  21
Math.round( 42   ); //  42
Math.round(-20.5 ); // -20
Math.round(-20.51); // -21
</pre>

<h2 id="Specifications">Specifications</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{SpecName('ES1')}}</td>
   <td>{{Spec2('ES1')}}</td>
   <td>Initial definition. Implemented in JavaScript 1.0.</td>
  </tr>
  <tr>
   <td>{{SpecName('ES5.1', '#sec-15.8.2.15', 'Math.round')}}</td>
   <td>{{Spec2('ES5.1')}}</td>
   <td> </td>
  </tr>
  <tr>
   <td>{{SpecName('ES6', '#sec-math.round', 'Math.round')}}</td>
   <td>{{Spec2('ES6')}}</td>
   <td> </td>
  </tr>
  <tr>
   <td>{{SpecName('ESDraft', '#sec-math.round', 'Math.round')}}</td>
   <td>{{Spec2('ESDraft')}}</td>
   <td> </td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<p>{{Compat("javascript.builtins.Math.round")}}</p>

<h2 id="See_also">See also</h2>

<ul>
 <li>{{jsxref("Number.toPrecision()")}}</li>
 <li>{{jsxref("Number.toFixed()")}}</li>
 <li>{{jsxref("Math.abs()")}}</li>
 <li>{{jsxref("Math.ceil()")}}</li>
 <li>{{jsxref("Math.floor()")}}</li>
 <li>{{jsxref("Math.sign()")}}</li>
 <li>{{jsxref("Math.trunc()")}}</li>
</ul>