simple calculator in html code code example
Example 1: calculator in html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Calculator </title>
</head>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
background: #fffbd5; /* fallback for old browsers */
background: -webkit-linear-gradient(
to right,
#b20a2c,
#fffbd5
); /* Chrome 10-25, Safari 5.1-6 */
background: linear-gradient(
to right,
#b20a2c,
#fffbd5
); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
}
.container-first {
position: relative;
background: #0b8000;
border-radius: 6px;
overflow: hidden;
z-index: 10;
}
.container-first .calculator {
position: relative;
display: grid;
}
.container-first .calculator .value {
grid-column: span 4;
height: 140px;
width: 300px;
border: none;
padding-left: 1em;
font-size: 2.5em;
color: gold;
}
.container-first .calculator span {
display: grid;
height: 4.5em;
font-weight: 900;
color: rgb(255, 255, 255);
text-align: center;
align-items: center;
font-size: 20px;
user-select: none;
border-bottom: 4px solid rgba(255, 255, 255, 0.07);
border-right: 4px solid rgba(255, 255, 255, 0.07);
}
input[type="text"] {
color: rgb(255, 136, 0);
background-color: rgb(156, 40, 40);
}
<body>
<div class="container-first">
<form name="val" class="calculator">
<input type="text" class="value" name="ans" />
<span onclick="document.val.ans.value+='4'">4</span>
<span onclick="document.val.ans.value+='5'">5</span>
<span onclick="document.val.ans.value+='6'">6</span>
<span onclick="document.val.ans.value =eval(document.val.ans.value)">
=
</span>
<span onclick="document.val.ans.value+='7'">7</span>
<span onclick="document.val.ans.value+='8'">8</span>
<span onclick="document.val.ans.value+='9'">9</span>
<span onclick="document.val.ans.value+='-'">-</span>
<span onclick="document.val.ans.value+='1'">1</span>
<span onclick="document.val.ans.value+='2'">2</span>
<span onclick="document.val.ans.value+='3'">3</span>
<span onclick="document.val.ans.value+='/'">/</span>
<span onclick="document.val.ans.value+='0'">0</span>
<span onclick="document.val.ans.value=''">C</span>
<span onclick="document.val.ans.value+='*'">*</span>
<span onclick="document.val.ans.value+='00'">00</span>
<span onclick="document.val.ans.value+='+'">+</span>
</form>
</div>
</body>
</html>
Example 2: how to create a simple calculator in html
<!DOCTYPE html>
<html lang="en">
<head>
<style>
.contain{
display: flex;
}
#display{
width: 98%;
}
.mathButtons{
width: 100px;
height: 40px;
background-color: rgb(0,0,0,0.3);
color: white;
}
.mathButtons:hover{
background-color: DodgerBlue;
}
#clearButton:hover{
background-color: orangered;
}
#container{
width: 430px;
height: 300px;
}
.buttondigits{
background-color: black;
color: white;
height: 40px;
width: 100px;
}
#clearButton{
width: 100px;
height: 40px;
background-color: rgb(0,0,0,0.3);
font-weight: bold;
}
.buttondigits:hover {
background-color: gray;
}
</style>
<title> standard calculator </title>
<meta charset="utf-8">
<link rel="stylesheet" href="cal.css"/>
</head>
<body>
<div class="container">
<fieldset id="container">
<form name="calculator">
<input type="text" id="display" name="display" readonly>
<br>
<br>
<br>
<div class="contain">
<input class="buttondigits" type="button" value="7" onclick="calculator.display.value += '7'">
<input class="buttondigits" type="button" value="8" onclick="calculator.display.value += '8'">
<input class="buttondigits" type="button" value="9" onclick="calculator.display.value += '9'">
<input class="mathButtons" type="button" value="+" onclick="calculator.display.value += '+'">
</div>
<div class="contain">
<input class="buttondigits" type="button" value="4" onclick="calculator.display.value += '4'">
<input class="buttondigits" type="button" value="5" onclick="calculator.display.value += '5'">
<input class="buttondigits" type="button" value="6" onclick="calculator.display.value += '6'">
<input class="mathButtons" type="button" value="-" onclick="calculator.display.value += '-'">
</div>
<div class="contain">
<input class="buttondigits" type="button" value="1" onclick="calculator.display.value += '1'">
<input class="buttondigits" type="button" value="2" onclick="calculator.display.value += '2'">
<input class="buttondigits" type="button" value="3" onclick="calculator.display.value += '3'">
<input class="mathButtons" type="button" value="*" onclick="calculator.display.value += '*'">
</div>
<div class="contain">
<input id="clearButton" class="button" type="button" value="C" onclick="calculator.display.value = ''">
<input class="buttondigits" type="button" value="0" onclick="calculator.display.value += '0'">
<input class= "mathButtons" type="button" value="=" onclick="calculator.display.value = eval(calculator.display.value)">
<input class="mathButtons" type="button" value="/" onclick="calculator.display.value += '/'">
</div>
</form>
</fieldset>
</div>
</body>
</html>
Example 3: how to make a calculator website HTML
<body>
<center>
<h1 class="text-danger">Calculator</h1>
<p class="q">Type in the numbers to be added, separate them with commas (,). If 'Invalid' shows, you have not used a number, please clear the box and type numbers</p>
</center>
<center>
<h3 style="font-family: Lucida Sans; color: lightseagreen">Add</h3>
<input class="addinput" type="text">
<button class="add" style="font-family: Lucida Sans; background-color: lightsalmon">ADD</button>
<p class="p" style="background-color:lightpink">Sum is <span class="result"></span></p>
</center>
<center>
<h3 style="font-family: Lucida Sans; color: lightseagreen">Multiply</h3>
<input class="multiplyinput" type="text">
<button class="multiply" style="font-family: Lucida Sans; background-color: lightsalmon">MULTIPLY</button>
<p class="p" style="background-color:lightpink"></p>>Product is <span class="product"></span></p>
</center>
<center>
<h3 style="font-family: Lucida Sans; color: lightseagreen">Subtract</h3>
<input class="subtractinput" type="text">
<button class="subtract" style="font-family: Lucida Sans; background-color: lightsalmon">SUBTRACT</button>
<p class="p" style="background-color:lightpink"></p>>Difference is <span class="difference"></span></p>
</center>
<center>
<h3 style="font-family: Lucida Sans; color: lightseagreen">Divide</h3>
<input class="divideinput" type="text">
<button class="divide" style="font-family: Lucida Sans; background-color: lightsalmon">DIVIDE</button>
<p class="p" style="background-color:lightpink"></p>>Quotient is <span class="quotient"></span></p>
</center>
<script src="calculator.js"></script>
</body>