Free Tools | ParcelPath

Percentage Calculator

What is % of
Percentage increase/decrease from to ?
Common Phrases

% of
is what % of
Percent to Fraction and Decimal

% =
Add or Subtract a Percentage

Percent Change

Percent Error

Percent Difference


<div class="percentage-calculator-container">
    <h2>Percentage Calculator</h2>

    
    <div class="calculator-box">
        <label>What is 
            <input type="number" id="value1" placeholder="%" step="any" max="100" min="0"> % of 
            <input type="number" id="value2" placeholder="Value" step="any">
        </label>
        <button class="calculate-btn" onclick="calculatePercentage()">Calculate</button>
        <input type="text" id="result1" placeholder="Result" readonly>
    </div>

    <hr />

    
    <div class="calculator-box">
        <label>Percentage increase/decrease from 
            <input type="number" id="value3" placeholder="Old Value" step="any"> to 
            <input type="number" id="value4" placeholder="New Value" step="any">?
        </label>
        <button class="calculate-btn" onclick="calculateIncrease()">Calculate</button>
        <input type="text" id="result2" placeholder="%" readonly>
    </div>

    <hr />

    
    <div class="calc-section">
        <h3>Common Phrases</h3>
        <div class="calc-row">
            <input type="number" id="commonPhrase1" placeholder="10">
            <span>% of</span>
            <input type="number" id="commonPhrase2" placeholder="90">
            <button class="calculate-btn" onclick="calculateCommonPhrase1()">Calculate</button>
            <input type="text" id="commonPhraseResult" placeholder="9" readonly>
        </div>
        <div class="calc-row">
            <input type="number" id="commonPhrase3" placeholder="9">
            <span>is what % of</span>
            <input type="number" id="commonPhrase4" placeholder="90">
            <button class="calculate-btn" onclick="calculateCommonPhrase2()">Calculate</button>
            <input type="text" id="commonPhraseResult2" placeholder="10%" readonly>
        </div>
    </div>

    <hr />

    
    <div class="calc-section">
        <h3>Percent to Fraction and Decimal</h3>
        <div class="calc-row">
            <input type="number" id="percentToFractionInput" placeholder="10">
            <span>% =</span>
            <div class="fraction-display">
                <input type="number" id="fractionNumerator" placeholder="10" readonly>
                <hr />
                <input type="number" id="fractionDenominator" value="100" readonly>
            </div>
            <span>=</span>
            <input type="text" id="decimalOutput" placeholder="0.1" readonly>
            <button class="calculate-btn" onclick="calculateFractionDecimal()">Calculate</button>
        </div>
    </div>

    <hr />

    
    <div class="calc-section">
        <h3>Add or Subtract a Percentage</h3>
        <div class="calc-row">
            <input type="number" id="startValue" placeholder="Start Value">
            <select id="addSubtract">
                <option value="add">+</option>
                <option value="subtract">-</option>
            </select>
            <input type="number" id="percentValue" placeholder="% of Start Value">
            <span>=</span>
            <input type="text" id="endValue" placeholder="End Value" readonly>
            <button class="calculate-btn" onclick="calculateAddSubtract()">Calculate</button>
        </div>
    </div>

    <hr />

    
    <div class="calc-section">
        <h3>Percent Change</h3>
        <div class="calc-row">
            <input type="number" id="oldValue" placeholder="Old Value">
            <input type="number" id="newValue" placeholder="New Value">
            <span>=</span>
            <input type="text" id="percentChangeOutput" placeholder="Percent Change" readonly>
            <button class="calculate-btn" onclick="calculatePercentChange()">Calculate</button>
        </div>
    </div>

    <hr />

    
    <div class="calc-section">
        <h3>Percent Error</h3>
        <div class="calc-row">
            <input type="number" id="theoreticalValue" placeholder="Theoretical Value">
            <input type="number" id="experimentalValue" placeholder="Experimental Value">
            <span>=</span>
            <input type="text" id="percentErrorOutput" placeholder="Percent Error" readonly>
            <button class="calculate-btn" onclick="calculatePercentError()">Calculate</button>
        </div>
    </div>

    <hr />

    
    <div class="calc-section">
        <h3>Percent Difference</h3>
        <div class="calc-row">
            <input type="number" id="value1" placeholder="One Value">
            <input type="number" id="value2" placeholder="Another Value">
            <span>=</span>
            <input type="text" id="percentDifferenceOutput" placeholder="Percent Difference" readonly>
            <button class="calculate-btn" onclick="calculatePercentDifference()">Calculate</button>
        </div>
    </div>

    
    <div class="branding">
        <a href="https://parcelpath.com" >
            <img decoding="async" src="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyMjAgNTgiIGJ2LWltZy11cmw9Imh0dHBzOi8vcGFyY2VscGF0aC5jb20vd3AtY29udGVudC91cGxvYWRzL2FsX29wdF9jb250ZW50L0lNQUdFL3BhcmNlbHBhdGguY29tL3dwLWNvbnRlbnQvdXBsb2Fkcy8yMDIyLzAxL1BhcmNlbFBhdGhMb2dvT0ItMS5wbmcuYnYud2VicCIgYnYtcmVzaXplZC1pbmZvcz0iWW5aZmNtVnphWHBsWkY5dGIySnBiR1V1Y0c1bk9qSXlNQ28xT0R0aWRsOXlaWE5wZW1Wa1gybHdZV1F1Y0c1bk9qSXlNQ28xT0R0aWRsOXlaWE5wZW1Wa1gyUmxjMnQwYjNBdWNHNW5Pakl5TUNvMU9BPT0iPjwvc3ZnPg==" alt="ParcelPath Logo" class="bottom-logo bv-image-lazyload">
        </a>
        <a href="https://parcelpath.com"  class="powered-by">Powered by ParcelPath</a>
    </div>
</div>


<script type="bv_inline_delayed_js" bv_unique_id="HHmyVsWBI7GtFtueeW9w" defer="1" data-cfasync="" async="">function calculatePercentage() {
        const percent = parseFloat(document.getElementById('value1').value);
        const value = parseFloat(document.getElementById('value2').value);
        const result = (percent / 100) * value;
        document.getElementById('result1').value = isNaN(result) ? '' : result.toFixed(2);
    }

    function calculateIncrease() {
        const oldValue = parseFloat(document.getElementById('value3').value);
        const newValue = parseFloat(document.getElementById('value4').value);
        const increase = ((newValue - oldValue) / Math.abs(oldValue)) * 100;
        document.getElementById('result2').value = isNaN(increase) ? '' : increase.toFixed(2);
    }

    function calculateCommonPhrase1() {
        const percent = parseFloat(document.getElementById('commonPhrase1').value);
        const ofValue = parseFloat(document.getElementById('commonPhrase2').value);
        const result = (percent / 100) * ofValue;
        document.getElementById('commonPhraseResult').value = isNaN(result) ? '' : result.toFixed(2);
    }

    function calculateCommonPhrase2() {
        const isValue = parseFloat(document.getElementById('commonPhrase3').value);
        const ofValue = parseFloat(document.getElementById('commonPhrase4').value);
        const result = (isValue / ofValue) * 100;
        document.getElementById('commonPhraseResult2').value = isNaN(result) ? '' : result.toFixed(2) + "%";
    }

    function calculateFractionDecimal() {
        const percent = parseFloat(document.getElementById('percentToFractionInput').value);
        document.getElementById('fractionNumerator').value = percent;
        document.getElementById('decimalOutput').value = (percent / 100).toFixed(2);
    }

    function calculateAddSubtract() {
        const startValue = parseFloat(document.getElementById('startValue').value);
        const percent = parseFloat(document.getElementById('percentValue').value) / 100;
        const operation = document.getElementById('addSubtract').value;
        const endValue = operation === 'add' ? startValue + (startValue * percent) : startValue - (startValue * percent);
        document.getElementById('endValue').value = isNaN(endValue) ? '' : endValue.toFixed(2);
    }

    function calculatePercentChange() {
        const oldValue = parseFloat(document.getElementById('oldValue').value);
        const newValue = parseFloat(document.getElementById('newValue').value);
        const percentChange = ((newValue - oldValue) / Math.abs(oldValue)) * 100;
        document.getElementById('percentChangeOutput').value = isNaN(percentChange) ? '' : percentChange.toFixed(2);
    }

    function calculatePercentError() {
        const theoreticalValue = parseFloat(document.getElementById('theoreticalValue').value);
        const experimentalValue = parseFloat(document.getElementById('experimentalValue').value);
        const percentError = (Math.abs(experimentalValue - theoreticalValue) / Math.abs(theoreticalValue)) * 100;
        document.getElementById('percentErrorOutput').value = isNaN(percentError) ? '' : percentError.toFixed(2);
    }

    function calculatePercentDifference() {
        const value1 = parseFloat(document.getElementById('value1').value);
        const value2 = parseFloat(document.getElementById('value2').value);
        const percentDifference = (Math.abs(value1 - value2) / ((value1 + value2) / 2)) * 100;
        document.getElementById('percentDifferenceOutput').value = isNaN(percentDifference) ? '' : percentDifference.toFixed(2);
    }</script>


<style>
    .percentage-calculator-container {
        width: 100%;
        max-width: 600px;
        margin: 0 auto;
        padding: 20px;
        background-color: #f7f9fc;
        border: 1px solid #ddd;
        border-radius: 10px;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
        font-family: Arial, sans-serif;
        color: #333;
    }

    h2, h3 {
        color: #0b3d62;
        text-align: center;
    }

    .calculator-box, .calc-section {
        padding: 15px;
        margin-bottom: 20px;
        background-color: #ffffff;
        border: 1px solid #ddd;
        border-radius: 6px;
    }

    input[type="number"], input[type="text"], select {
        padding: 10px;
        font-size: 14px;
        margin: 10px 5px;
        width: 80px;
        text-align: center;
        border: 1px solid #ccc;
        border-radius: 4px;
    }

    .calc-row {
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

    span {
        margin: 0 10px;
        font-size: 16px;
        color: #555;
    }

    button.calculate-btn {
        padding: 8px 20px;
        background-color: #0b3d62;
        color: white;
        border: none;
        border-radius: 5px;
        font-size: 14px;
        cursor: pointer;
    }

    button.calculate-btn:hover {
        background-color: #08324d;
    }

    hr {
        border: none;
        border-top: 1px solid #ccc;
        margin: 20px 0;
    }

    .branding {
        text-align: center;
        margin-top: 20px;
    }

    .bottom-logo {
        height: 40px;
        display: block;
        margin: 0 auto;
    }

    .powered-by {
        font-size: 14px;
        color: #0b3d62;
        display: block;
        margin-top: 5px;
        text-decoration: none;
    }

    .powered-by:hover {
        color: #08324d;
    }
</style>