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IT, 프로그램, SW개발/알고리즘

간단한 단위변환 계산기 만들기 (코드)

by RedBaDa 2025. 9. 16.
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아래 코드를 unit_converter.html 로 저장하여 브라우저에서 불러 사용하면됨

 

<!DOCTYPE html>
<html lang="ko">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>공학용 단위 변환기</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 20px;
        }

        .container {
            max-width: 800px;
            margin: 0 auto;
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
            overflow: hidden;
        }

        .header {
            background: linear-gradient(135deg, #2c3e50, #3498db);
            color: white;
            padding: 30px;
            text-align: center;
        }

        .header h1 {
            font-size: 2.5em;
            margin-bottom: 10px;
        }

        .header p {
            font-size: 1.1em;
            opacity: 0.9;
        }

        .tabs {
            display: flex;
            background: #f8f9fa;
            border-bottom: 1px solid #dee2e6;
        }

        .tab {
            flex: 1;
            padding: 15px;
            text-align: center;
            cursor: pointer;
            background: #f8f9fa;
            border: none;
            font-size: 1em;
            transition: all 0.3s ease;
        }

        .tab:hover {
            background: #e9ecef;
        }

        .tab.active {
            background: #007bff;
            color: white;
        }

        .tab-content {
            display: none;
            padding: 30px;
        }

        .tab-content.active {
            display: block;
        }

        .converter-group {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 20px;
        }

        .input-group {
            display: flex;
            flex-direction: column;
        }

        .input-group label {
            margin-bottom: 8px;
            font-weight: 600;
            color: #495057;
        }

        .input-group input, .input-group select {
            padding: 12px;
            border: 2px solid #dee2e6;
            border-radius: 8px;
            font-size: 1em;
            transition: border-color 0.3s ease;
        }

        .input-group input:focus, .input-group select:focus {
            outline: none;
            border-color: #007bff;
        }

        .result {
            background: #f8f9fa;
            padding: 20px;
            border-radius: 8px;
            margin-top: 20px;
            text-align: center;
        }

        .result h3 {
            color: #495057;
            margin-bottom: 10px;
        }

        .result-value {
            font-size: 1.5em;
            font-weight: bold;
            color: #007bff;
        }

        .formula {
            background: #e3f2fd;
            padding: 15px;
            border-radius: 8px;
            margin-top: 15px;
            font-family: 'Courier New', monospace;
            font-size: 0.9em;
            color: #1976d2;
        }

        @media (max-width: 768px) {
            .converter-group {
                grid-template-columns: 1fr;
            }
            
            .tabs {
                flex-direction: column;
            }
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="header">
            <h1>공학용 단위 변환기</h1>
            <p>길이, 무게, 온도, 면적, 부피 단위를 쉽게 변환하세요</p>
        </div>

        <div class="tabs">
            <button class="tab active" onclick="showTab('length')">길이</button>
            <button class="tab" onclick="showTab('weight')">무게</button>
            <button class="tab" onclick="showTab('temperature')">온도</button>
            <button class="tab" onclick="showTab('area')">면적</button>
            <button class="tab" onclick="showTab('volume')">부피</button>
        </div>

        <!-- 길이 변환 -->
        <div id="length" class="tab-content active">
            <div class="converter-group">
                <div class="input-group">
                    <label for="length-from">변환할 값</label>
                    <input type="number" id="length-from" placeholder="값을 입력하세요" oninput="convertLength()">
                    <select id="length-from-unit" onchange="convertLength()">
                        <option value="meter">미터 (m)</option>
                        <option value="kilometer">킬로미터 (km)</option>
                        <option value="centimeter">센티미터 (cm)</option>
                        <option value="millimeter">밀리미터 (mm)</option>
                        <option value="mile">마일 (mi)</option>
                        <option value="yard">야드 (yd)</option>
                        <option value="foot">피트 (ft)</option>
                        <option value="inch">인치 (in)</option>
                    </select>
                </div>
                <div class="input-group">
                    <label for="length-to">변환 결과</label>
                    <input type="number" id="length-to" readonly>
                    <select id="length-to-unit" onchange="convertLength()">
                        <option value="meter">미터 (m)</option>
                        <option value="kilometer">킬로미터 (km)</option>
                        <option value="centimeter">센티미터 (cm)</option>
                        <option value="millimeter">밀리미터 (mm)</option>
                        <option value="mile">마일 (mi)</option>
                        <option value="yard">야드 (yd)</option>
                        <option value="foot">피트 (ft)</option>
                        <option value="inch">인치 (in)</option>
                    </select>
                </div>
            </div>
            <div class="result">
                <h3>변환 결과</h3>
                <div class="result-value" id="length-result">0</div>
                <div class="formula" id="length-formula">변환 공식이 여기에 표시됩니다</div>
            </div>
        </div>

        <!-- 무게 변환 -->
        <div id="weight" class="tab-content">
            <div class="converter-group">
                <div class="input-group">
                    <label for="weight-from">변환할 값</label>
                    <input type="number" id="weight-from" placeholder="값을 입력하세요" oninput="convertWeight()">
                    <select id="weight-from-unit" onchange="convertWeight()">
                        <option value="kilogram">킬로그램 (kg)</option>
                        <option value="gram">그램 (g)</option>
                        <option value="milligram">밀리그램 (mg)</option>
                        <option value="ton">톤 (t)</option>
                        <option value="pound">파운드 (lb)</option>
                        <option value="ounce">온스 (oz)</option>
                    </select>
                </div>
                <div class="input-group">
                    <label for="weight-to">변환 결과</label>
                    <input type="number" id="weight-to" readonly>
                    <select id="weight-to-unit" onchange="convertWeight()">
                        <option value="kilogram">킬로그램 (kg)</option>
                        <option value="gram">그램 (g)</option>
                        <option value="milligram">밀리그램 (mg)</option>
                        <option value="ton">톤 (t)</option>
                        <option value="pound">파운드 (lb)</option>
                        <option value="ounce">온스 (oz)</option>
                    </select>
                </div>
            </div>
            <div class="result">
                <h3>변환 결과</h3>
                <div class="result-value" id="weight-result">0</div>
                <div class="formula" id="weight-formula">변환 공식이 여기에 표시됩니다</div>
            </div>
        </div>

        <!-- 온도 변환 -->
        <div id="temperature" class="tab-content">
            <div class="converter-group">
                <div class="input-group">
                    <label for="temp-from">변환할 값</label>
                    <input type="number" id="temp-from" placeholder="값을 입력하세요" oninput="convertTemperature()">
                    <select id="temp-from-unit" onchange="convertTemperature()">
                        <option value="celsius">섭씨 (°C)</option>
                        <option value="fahrenheit">화씨 (°F)</option>
                        <option value="kelvin">켈빈 (K)</option>
                    </select>
                </div>
                <div class="input-group">
                    <label for="temp-to">변환 결과</label>
                    <input type="number" id="temp-to" readonly>
                    <select id="temp-to-unit" onchange="convertTemperature()">
                        <option value="celsius">섭씨 (°C)</option>
                        <option value="fahrenheit">화씨 (°F)</option>
                        <option value="kelvin">켈빈 (K)</option>
                    </select>
                </div>
            </div>
            <div class="result">
                <h3>변환 결과</h3>
                <div class="result-value" id="temp-result">0</div>
                <div class="formula" id="temp-formula">변환 공식이 여기에 표시됩니다</div>
            </div>
        </div>

        <!-- 면적 변환 -->
        <div id="area" class="tab-content">
            <div class="converter-group">
                <div class="input-group">
                    <label for="area-from">변환할 값</label>
                    <input type="number" id="area-from" placeholder="값을 입력하세요" oninput="convertArea()">
                    <select id="area-from-unit" onchange="convertArea()">
                        <option value="squaremeter">제곱미터 (m²)</option>
                        <option value="squarekilometer">제곱킬로미터 (km²)</option>
                        <option value="squarecentimeter">제곱센티미터 (cm²)</option>
                        <option value="hectare">헥타르 (ha)</option>
                        <option value="acre">에이커 (ac)</option>
                        <option value="squarefoot">제곱피트 (ft²)</option>
                        <option value="squareyard">제곱야드 (yd²)</option>
                        <option value="pyeong">평 (坪)</option>
                    </select>
                </div>
                <div class="input-group">
                    <label for="area-to">변환 결과</label>
                    <input type="number" id="area-to" readonly>
                    <select id="area-to-unit" onchange="convertArea()">
                        <option value="squaremeter">제곱미터 (m²)</option>
                        <option value="squarekilometer">제곱킬로미터 (km²)</option>
                        <option value="squarecentimeter">제곱센티미터 (cm²)</option>
                        <option value="hectare">헥타르 (ha)</option>
                        <option value="acre">에이커 (ac)</option>
                        <option value="squarefoot">제곱피트 (ft²)</option>
                        <option value="squareyard">제곱야드 (yd²)</option>
                        <option value="pyeong">평 (坪)</option>
                    </select>
                </div>
            </div>
            <div class="result">
                <h3>변환 결과</h3>
                <div class="result-value" id="area-result">0</div>
                <div class="formula" id="area-formula">변환 공식이 여기에 표시됩니다</div>
            </div>
        </div>

        <!-- 부피 변환 -->
        <div id="volume" class="tab-content">
            <div class="converter-group">
                <div class="input-group">
                    <label for="volume-from">변환할 값</label>
                    <input type="number" id="volume-from" placeholder="값을 입력하세요" oninput="convertVolume()">
                    <select id="volume-from-unit" onchange="convertVolume()">
                        <option value="cubicmeter">세제곱미터 (m³)</option>
                        <option value="liter">리터 (L)</option>
                        <option value="milliliter">밀리리터 (mL)</option>
                        <option value="gallon">갤런 (gal)</option>
                        <option value="quart">쿼트 (qt)</option>
                        <option value="pint">파인트 (pt)</option>
                        <option value="cup">컵 (c)</option>
                        <option value="fluidounce">액량 온스 (fl oz)</option>
                    </select>
                </div>
                <div class="input-group">
                    <label for="volume-to">변환 결과</label>
                    <input type="number" id="volume-to" readonly>
                    <select id="volume-to-unit" onchange="convertVolume()">
                        <option value="cubicmeter">세제곱미터 (m³)</option>
                        <option value="liter">리터 (L)</option>
                        <option value="milliliter">밀리리터 (mL)</option>
                        <option value="gallon">갤런 (gal)</option>
                        <option value="quart">쿼트 (qt)</option>
                        <option value="pint">파인트 (pt)</option>
                        <option value="cup">컵 (c)</option>
                        <option value="fluidounce">액량 온스 (fl oz)</option>
                    </select>
                </div>
            </div>
            <div class="result">
                <h3>변환 결과</h3>
                <div class="result-value" id="volume-result">0</div>
                <div class="formula" id="volume-formula">변환 공식이 여기에 표시됩니다</div>
            </div>
        </div>
    </div>

    <script>
        // 단위 변환 상수 (기준: 미터법 단위)
        const lengthUnits = {
            meter: 1,
            kilometer: 0.001,
            centimeter: 100,
            millimeter: 1000,
            mile: 0.000621371,
            yard: 1.09361,
            foot: 3.28084,
            inch: 39.3701
        };

        const weightUnits = {
            kilogram: 1,
            gram: 1000,
            milligram: 1000000,
            ton: 0.001,
            pound: 2.20462,
            ounce: 35.274
        };

        const areaUnits = {
            squaremeter: 1,
            squarekilometer: 0.000001,
            squarecentimeter: 10000,
            hectare: 0.0001,
            acre: 0.000247105,
            squarefoot: 10.7639,
            squareyard: 1.19599,
            pyeong: 0.3025
        };

        const volumeUnits = {
            cubicmeter: 1,
            liter: 1000,
            milliliter: 1000000,
            gallon: 264.172,
            quart: 1056.69,
            pint: 2113.38,
            cup: 4226.75,
            fluidounce: 33814
        };

        // 탭 전환 함수
        function showTab(tabName) {
            // 모든 탭 내용 숨기기
            const tabContents = document.querySelectorAll('.tab-content');
            tabContents.forEach(tab => tab.classList.remove('active'));
            
            // 모든 탭 버튼 비활성화
            const tabs = document.querySelectorAll('.tab');
            tabs.forEach(tab => tab.classList.remove('active'));
            
            // 선택한 탭 내용 보이기
            document.getElementById(tabName).classList.add('active');
            
            // 선택한 탭 버튼 활성화
            event.target.classList.add('active');
        }

        // 길이 변환 함수
        function convertLength() {
            const fromValue = parseFloat(document.getElementById('length-from').value) || 0;
            const fromUnit = document.getElementById('length-from-unit').value;
            const toUnit = document.getElementById('length-to-unit').value;
            
            // 미터로 변환 후 목표 단위로 변환
            const meters = fromValue / lengthUnits[fromUnit];
            const result = meters * lengthUnits[toUnit];
            
            document.getElementById('length-to').value = result.toFixed(6);
            document.getElementById('length-result').textContent = `${fromValue} ${getUnitName(fromUnit)} = ${result.toFixed(6)} ${getUnitName(toUnit)}`;
            document.getElementById('length-formula').textContent = `${fromValue} × (${lengthUnits[toUnit]} / ${lengthUnits[fromUnit]}) = ${result.toFixed(6)}`;
        }

        // 무게 변환 함수
        function convertWeight() {
            const fromValue = parseFloat(document.getElementById('weight-from').value) || 0;
            const fromUnit = document.getElementById('weight-from-unit').value;
            const toUnit = document.getElementById('weight-to-unit').value;
            
            // 킬로그램으로 변환 후 목표 단위로 변환
            const kilograms = fromValue / weightUnits[fromUnit];
            const result = kilograms * weightUnits[toUnit];
            
            document.getElementById('weight-to').value = result.toFixed(6);
            document.getElementById('weight-result').textContent = `${fromValue} ${getUnitName(fromUnit)} = ${result.toFixed(6)} ${getUnitName(toUnit)}`;
            document.getElementById('weight-formula').textContent = `${fromValue} × (${weightUnits[toUnit]} / ${weightUnits[fromUnit]}) = ${result.toFixed(6)}`;
        }

        // 온도 변환 함수
        function convertTemperature() {
            const fromValue = parseFloat(document.getElementById('temp-from').value) || 0;
            const fromUnit = document.getElementById('temp-from-unit').value;
            const toUnit = document.getElementById('temp-to-unit').value;
            
            let celsius, result;
            let formula = '';
            
            // 섭씨로 변환
            switch(fromUnit) {
                case 'celsius':
                    celsius = fromValue;
                    break;
                case 'fahrenheit':
                    celsius = (fromValue - 32) * 5/9;
                    break;
                case 'kelvin':
                    celsius = fromValue - 273.15;
                    break;
            }
            
            // 섭씨에서 목표 단위로 변환
            switch(toUnit) {
                case 'celsius':
                    result = celsius;
                    formula = `${fromValue}°${fromUnit.charAt(0).toUpperCase()} = ${result.toFixed(2)}°C`;
                    break;
                case 'fahrenheit':
                    result = celsius * 9/5 + 32;
                    formula = `${fromValue}°${fromUnit.charAt(0).toUpperCase()} × (9/5) + 32 = ${result.toFixed(2)}°F`;
                    break;
                case 'kelvin':
                    result = celsius + 273.15;
                    formula = `${fromValue}°${fromUnit.charAt(0).toUpperCase()} + 273.15 = ${result.toFixed(2)}K`;
                    break;
            }
            
            document.getElementById('temp-to').value = result.toFixed(2);
            document.getElementById('temp-result').textContent = `${fromValue}°${fromUnit.charAt(0).toUpperCase()} = ${result.toFixed(2)}°${toUnit.charAt(0).toUpperCase()}`;
            document.getElementById('temp-formula').textContent = formula;
        }

        // 면적 변환 함수
        function convertArea() {
            const fromValue = parseFloat(document.getElementById('area-from').value) || 0;
            const fromUnit = document.getElementById('area-from-unit').value;
            const toUnit = document.getElementById('area-to-unit').value;
            
            // 제곱미터로 변환 후 목표 단위로 변환
            const squareMeters = fromValue / areaUnits[fromUnit];
            const result = squareMeters * areaUnits[toUnit];
            
            document.getElementById('area-to').value = result.toFixed(6);
            document.getElementById('area-result').textContent = `${fromValue} ${getUnitName(fromUnit)} = ${result.toFixed(6)} ${getUnitName(toUnit)}`;
            document.getElementById('area-formula').textContent = `${fromValue} × (${areaUnits[toUnit]} / ${areaUnits[fromUnit]}) = ${result.toFixed(6)}`;
        }

        // 부피 변환 함수
        function convertVolume() {
            const fromValue = parseFloat(document.getElementById('volume-from').value) || 0;
            const fromUnit = document.getElementById('volume-from-unit').value;
            const toUnit = document.getElementById('volume-to-unit').value;
            
            // 세제곱미터로 변환 후 목표 단위로 변환
            const cubicMeters = fromValue / volumeUnits[fromUnit];
            const result = cubicMeters * volumeUnits[toUnit];
            
            document.getElementById('volume-to').value = result.toFixed(6);
            document.getElementById('volume-result').textContent = `${fromValue} ${getUnitName(fromUnit)} = ${result.toFixed(6)} ${getUnitName(toUnit)}`;
            document.getElementById('volume-formula').textContent = `${fromValue} × (${volumeUnits[toUnit]} / ${volumeUnits[fromUnit]}) = ${result.toFixed(6)}`;
        }

        // 단위 이름 가져오기 함수
        function getUnitName(unitKey) {
            const unitNames = {
                meter: 'm',
                kilometer: 'km',
                centimeter: 'cm',
                millimeter: 'mm',
                mile: 'mi',
                yard: 'yd',
                foot: 'ft',
                inch: 'in',
                kilogram: 'kg',
                gram: 'g',
                milligram: 'mg',
                ton: 't',
                pound: 'lb',
                ounce: 'oz',
                celsius: '°C',
                fahrenheit: '°F',
                kelvin: 'K',
                squaremeter: 'm²',
                squarekilometer: 'km²',
                squarecentimeter: 'cm²',
                hectare: 'ha',
                acre: 'ac',
                squarefoot: 'ft²',
                squareyard: 'yd²',
                pyeong: '평',
                cubicmeter: 'm³',
                liter: 'L',
                milliliter: 'mL',
                gallon: 'gal',
                quart: 'qt',
                pint: 'pt',
                cup: 'c',
                fluidounce: 'fl oz'
            };
            return unitNames[unitKey] || unitKey;
        }
    </script>
</body>
</html>
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