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Editorial Team
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Asked: 2026-06-05T21:48:04+00:00

I am building an html5 calculator that looks like <form onsubmit=return false oninput=o.value =

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I am building an html5 calculator that looks like

<form onsubmit="return false" oninput="o.value = a.valueAsNumber + b.valueAsNumber"<br>
    <input name="a" id="a" type="number" step="any"> +<br>
    <input name="b" id="b" type="number" step="any"> =<br>
    <output name="o" for="a b"></output><br>
</form>

And would like to round the results to 2 decimal points.

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1 Answer

  1. Editorial Team

    toFixed is another way to achieve what you are looking for, and will always show the decimal places regardless if they are 0 or not.

    <form onsubmit="return false" oninput="o.value = (a.valueAsNumber + b.valueAsNumber).toFixed(2)"<br>
    <input name="a" id="a" type="number" step="any"> +<br>
    <input name="b" id="b" type="number" step="any"> =<br>
    <output name="o" for="a b"></output><br>
</form>​

    Live Demo

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