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HTML | Scientific Calculator

  • Difficulty Level : Expert
  • Last Updated : 22 Jun, 2021

Here a Scientific Calculator is going to be formed by using HTML, CSS, and JavaScript. 
 

  • Calculator Title: This is the title at the top of our application, “GeeksforGeeks Scientific Calculator”.
  • Output Screen: This will be output screen, where all text will be shown. Like the input that the user will type and the answer calculated from the user input. So, we can again break down this into two smaller pieces as shown below: 
    • Question Output: This will be the input given by the user.
    • Answer Output: This will be the result calculated from user input.

Operations: This scientific calculator can perform following operations which are listed below: 
 

  • Square root
  • Percentage
  • Factorial
  • Constants (pie, euler constant, log2 base e, log 10 base e)
  • Exponent
  • log base 2, 10, e
  • Power
  • Sin, Tan, Cos (enter angle in radians )

HTML Code: 
 

HTML




<!DOCTYPE html>
<html>
     
<head>
    <title>
        Scientific Calculator using HTML, CSS and Js
    </title>
     
    <!-- CSS property to create interactive
        calculator interface -->
    <style>
     
        /* Style to set the title of calculator */
        .title {
            margin-bottom: 10px;
            padding: 5px 0;
            font-size: 20px;
            font-weight:bold;
            text-align:center;
            width: 447px;
            color:green;
            border: solid black 2px;
        }
         
        /* Set the button style */
        #btn {
            width: 100%;
            height: 40px;
            font-size: 30px;
        }
         
        input[type="button"] {
            background-color:green;
            color: black;
            border: solid black 2px;
            width:100%
        }
         
        /* Set input textarea */
        input[type="text"] {
            background-color:white;
            border: solid black 2px;
            width:100%
        }
    </style>
     
    <script>
         
        /* Creating function in HTML for backspace operation */
        function backspace(calc) {                                            
            size = calc.display.value.length;
            calc.display.value = calc.display.value.substring(0, size-1);
        }
         
        /* Creating function to calculate factorial of element */
        function calculate(calc) {
             
            /* Check if function include ! character then
            calculate factorial of number */
            if(calc.display.value.includes("!")) {
                 
                size = calc.display.value.length;
                n = Number(calc.display.value.substring(0, size-1));
                f = 1;
                 
                for(i = 2; i <= n; i++)
                    f = f*i;
                calc.display.value = f;
            }
             
            /* If function include % character then calculate
            the % of number */
            else if(calc.display.value.includes("%")) {
                 
                size = calc.display.value.length;
                n = Number(calc.display.value.substring(0, size-1));
                calc.display.value = n/100;
            }
 
            else   
                /* Otherwise evaluate and execute output */
                calc.display.value = eval(calc.display.value);
        }
    </script>
</head>
 
<body>
    <div class = title >
        GeeksforGeeks Scientific Calculator
    </div>
     
    <form name = "calc">
         
    <table id = "calc" border = 2>
         
    <tr>
        <td colspan=5><input id="btn" name="display"
            onkeypress="return event.charCode >= 48
            && event.charCode <= 57" type="text">
        </td>
    </tr>
     
    <tr>
        <td><input id="btn" type="button" value="1"
                OnClick="calc.display.value+='1'">
        </td>
         
        <td><input id="btn" type="button" value="2"
                OnClick="calc.display.value+='2'">
        </td>
         
        <td><input id="btn" type="button" value="3"
                OnClick="calc.display.value+='3'">
        </td>
         
        <td><input id="btn" type="button" value="C"
                OnClick="calc.display.value=''">
        </td>
        <td><input id="btn" type="button" value="<-"
                OnClick="backspace(this.form)">
        </td>
        <td><input id="btn" type="button" value="="
                OnClick="calculate(this.form)">
        </td>
    </tr>
     
    <tr>
        <td><input id="btn" type="button" value="4"
                OnClick="calc.display.value+='4'">
        </td>
         
        <td><input id="btn" type="button" value="5"
                OnClick="calc.display.value+='5'">
        </td>
         
        <td><input id="btn" type="button" value="6"
                OnClick="calc.display.value+='6'">
        </td>
         
        <td><input id="btn" type="button" value="-"
                OnClick="calc.display.value='-'">
        </td>
         
        <td><input id="btn" type="button" value="%"
                OnClick="calc.display.value+='%'">
        </td>
         
        <td><input id="btn" type="button" value="cos"
                OnClick="calc.display.value='Math.cos('">
        </td>
    </tr>
     
    <tr>
        <td><input id="btn" type="button" value="7"
                OnClick="calc.display.value+='7'">
        </td>
         
        <td><input id="btn" type="button" value="8"
                OnClick="calc.display.value+='8'">
        </td>
         
        <td><input id="btn" type="button" value="9"
                OnClick="calc.display.value+='9'">
        </td>
         
        <td><input id="btn" type="button" value="*"
                OnClick="calc.display.value+='*'">
        </td>
         
        <td><input id="btn" type="button" value="n!"
                OnClick="calc.display.value+='!'">
        </td>
         
        <td><input id="btn" type="button" value="sin"
                OnClick="calc.display.value='Math.sin('">
        </td>
    </tr>
     
    <tr>
        <td><input id="btn" type="button" value="."
                OnClick="calc.display.value+='.'">
        </td>
         
        <td><input id="btn" type="button" value="0"
                OnClick="calc.display.value+='0'">
        </td>
         
        <td><input id="btn" type="button" value=","
                OnClick="calc.display.value+=','">
        </td>
         
        <td><input id="btn" type="button" value="+"
                OnClick="calc.display.value+='+'">
        </td>
         
        <td><input id="btn" type="button" value="/"
                OnClick="calc.display.value+='/'">
        </td>
         
        <td><input id="btn" type="button" value="tan"
                OnClick="calc.display.value='Math.tan('">
        </td>
    </tr>
     
    <tr>
        <td><input id="btn" type="button" value="E"
                OnClick="calc.display.value+='Math.E'">
        </td>
         
        <td><input id="btn" type="button" value="pi"
                OnClick="calc.display.value+='Math.PI'">
        </td>
         
        <td><input id="btn" type="button" value="^"
                OnClick="calc.display.value+='Math.pow('">
        </td>
         
        <td><input id="btn" type="button" value="("
                OnClick="calc.display.value+='('">
        </td>
         
        <td><input id="btn" type="button" value=")"
                OnClick="calc.display.value+=')'">
        </td>
         
        <td><input id="btn" type="button" value="log"
                OnClick="calc.display.value='Math.log('">
        </td>
    </tr>
     
    <tr>
        <td><input id="btn" type="button" value="sqrt"
                OnClick="calc.display.value+='Math.sqrt('">
        </td>
         
        <td><input id="btn" type="button" value="ln2"
                OnClick="calc.display.value+='Math.LN2'">
        </td>
         
        <td><input id="btn" type="button" value="ln10"
                OnClick="calc.display.value+='Math.Log10'">
        </td>
         
        <td><input id="btn" type="button" value="l2e"
                OnClick="calc.display.value+='Math.LOG2E'">
        </td>
         
        <td><input id="btn" type="button" value="l10e"
                OnClick="calc.display.value+='Math.log10'">
        </td>
         
        <td><input id="btn" type="button" value="exp"
                OnClick="calc.display.value='Math.exp('">
        </td>
    </tr>
    </table>
    </form>
</body>
 
</html>                               

Generated Scientific Calculator: 
 



Calculate cos(0) Value: 
 

 

 

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