💻DPI Calculator

Professional DPI Calculator for print resolution, gaming eDPI, monitor PPI, and pixel density calculations. Perfect for photographers, designers, gamers, and developers.

🤔 What Is a DPI Calculator?

Think of a precision measuring tool for screens and images - that's our DPI calculator! It figures out pixel density for monitors, print resolution for photos, and gaming sensitivity (eDPI) all in one place. Gamers get perfect aim, designers get crisp prints!

📐 Print Resolution Calculator

Calculate DPI for optimal print quality based on image dimensions and print size.

Image Width (pixels)

Image Height (pixels)

Print Width

Print Height

Units

📊 Your print DPI results will appear here

🖥️ Monitor Pixel Density Calculator

Calculate PPI (pixels per inch) for displays and monitors to assess screen sharpness.

Screen Width (pixels)

Screen Height (pixels)

Diagonal Size (inches)

📱 Your monitor PPI results will appear here

🎮 Gaming eDPI Calculator

Calculate effective DPI (eDPI) for gaming to compare mouse sensitivity across different games.

Mouse DPI

In-Game Sensitivity

Sensitivity Type

🎮 Your eDPI results will appear here

🔄 DPI Resolution Converter

Convert between different DPI values and calculate optimal print sizes.

Image Width (pixels)

Image Height (pixels)

Target DPI

📏 Your conversion results will appear here

📋 Quick Presets & Examples

📸 4K Photo Print

3840×2160 → 8×6 inches

🖥️ 1080p Monitor

1920×1080 → 27" display

🎮 Pro Gamer Setup

800 DPI × 0.35 sens

🌐 Web Graphics

72 DPI for web display

✅ Image: ${results.imageWidth}×${results.imageHeight} pixels
📐 Print: ${results.printWidth}×${results.printHeight} ${results.units}
📊 Recommended: 300+ DPI for photos, 150+ DPI for posters

`; } // ========== MONITOR PPI CALCULATOR ========== function calculateMonitorPPI() { const screenWidth = parseFloat(document.getElementById('screenWidth').value); const screenHeight = parseFloat(document.getElementById('screenHeight').value); const diagonal = parseFloat(document.getElementById('screenDiagonal').value); if (!screenWidth || !screenHeight || !diagonal) { showError('Please fill in all fields for monitor PPI calculation'); return; } const diagonalPixels = Math.sqrt(screenWidth * screenWidth + screenHeight * screenHeight); const ppi = diagonalPixels / diagonal; const aspectRatio = Math.round((screenWidth / screenHeight) * 100) / 100; const totalPixels = screenWidth * screenHeight; const megapixels = totalPixels / 1000000; // Calculate dot pitch (distance between pixels) const dotPitch = 25.4 / ppi; // in millimeters // Quality assessment for displays let quality = 'Standard'; let qualityClass = 'quality-fair'; if (ppi >= 400) { quality = 'Retina+'; qualityClass = 'quality-excellent'; } else if (ppi >= 300) { quality = 'Retina'; qualityClass = 'quality-excellent'; } else if (ppi >= 200) { quality = 'High'; qualityClass = 'quality-good'; } else if (ppi >= 100) { quality = 'Standard'; qualityClass = 'quality-fair'; } else { quality = 'Low'; qualityClass = 'quality-poor'; } displayMonitorResults({ ppi: ppi.toFixed(1), quality, qualityClass, aspectRatio, megapixels: megapixels.toFixed(1), dotPitch: dotPitch.toFixed(3), screenWidth, screenHeight, diagonal }); showOTA(); trackEvent('dpi_calculated', { type: 'monitor' }); } function displayMonitorResults(results) { const container = document.getElementById('monitorResults'); container.innerHTML = `

${results.ppi} PPI ${results.quality}

Pixel Density

${results.ppi} PPI

Dot Pitch

${results.dotPitch} mm

Aspect Ratio

${results.aspectRatio}:1

Total Pixels

${results.megapixels} MP

📱 Resolution: ${results.screenWidth}×${results.screenHeight} pixels
📐 Size: ${results.diagonal}" diagonal
📊 Retina displays typically have 300+ PPI

`; } // ========== GAMING eDPI CALCULATOR ========== function calculateGamingEDPI() { const mouseDPI = parseFloat(document.getElementById('mouseDPI').value); const gameSens = parseFloat(document.getElementById('gameSens').value); const sensType = document.getElementById('sensType').value; if (!mouseDPI || !gameSens) { showError('Please fill in all fields for eDPI calculation'); return; } let sensitivity = gameSens; if (sensType === 'percentage') { sensitivity = gameSens / 100; } const eDPI = mouseDPI * sensitivity; // Calculate cm/360 (approximate) const cm360 = 103.2 / eDPI; // Approximate formula for most games // Professional ranges for different games let gameCategory = 'High Sensitivity'; let categoryClass = 'quality-fair'; if (eDPI <= 400) { gameCategory = 'Pro Low Sens'; categoryClass = 'quality-excellent'; } else if (eDPI <= 800) { gameCategory = 'Pro Range'; categoryClass = 'quality-good'; } else if (eDPI <= 1200) { gameCategory = 'Medium Sens'; categoryClass = 'quality-fair'; } else { gameCategory = 'High Sens'; categoryClass = 'quality-poor'; } displayGamingResults({ eDPI: eDPI.toFixed(0), cm360: cm360.toFixed(1), gameCategory, categoryClass, mouseDPI, gameSens, sensType }); showOTA(); trackEvent('dpi_calculated', { type: 'gaming' }); } function displayGamingResults(results) { const container = document.getElementById('gamingResults'); const sensDisplay = results.sensType === 'percentage' ? `${results.gameSens}%` : results.gameSens; container.innerHTML = `

${results.eDPI} eDPI ${results.gameCategory}

Mouse DPI

${results.mouseDPI}

Game Sensitivity

${sensDisplay}

cm/360°

${results.cm360} cm

📏 Print Size Options

📸 300 DPI (Photo Quality): ${results.sizes.excellent.width.toFixed(1)}" × ${results.sizes.excellent.height.toFixed(1)}"
📋 200 DPI (Good Quality): ${results.sizes.good.width.toFixed(1)}" × ${results.sizes.good.height.toFixed(1)}"
📄 150 DPI (Fair Quality): ${results.sizes.fair.width.toFixed(1)}" × ${results.sizes.fair.height.toFixed(1)}"
🌐 72 DPI (Web/Screen): ${results.sizes.minimum.width.toFixed(1)}" × ${results.sizes.minimum.height.toFixed(1)}"

📐 Image: ${results.convWidth}×${results.convHeight} pixels
🎯 At ${results.targetDPI} DPI target resolution
📊 Higher DPI = better quality but smaller prints

`; } // ========== SAMPLE USAGE FUNCTIONS ========== function useSample(sampleId) { const samples = { '4k-photo': { tab: 'print', data: { imageWidth: 3840, imageHeight: 2160, printWidth: 8, printHeight: 6, units: 'inches' } }, '1080p-monitor': { tab: 'monitor', data: { screenWidth: 1920, screenHeight: 1080, diagonal: 27 } }, 'gaming-pro': { tab: 'gaming', data: { mouseDPI: 800, gameSens: 0.35, sensType: 'decimal' } }, 'web-graphics': { tab: 'converter', data: { convWidth: 1920, convHeight: 1080, targetDPI: 72 } } }; const sample = samples[sampleId]; if (!sample) return; // Switch to appropriate tab switchTab(sample.tab); // Fill in the data Object.keys(sample.data).forEach(key => { const element = document.getElementById(key); if (element) { element.value = sample.data[key]; } }); // Highlight the calculate button setTimeout(() => { const calculateButtons = document.querySelectorAll('.btn'); const activeTab = document.querySelector('.tab-content.active'); const activeButton = activeTab.querySelector('.btn'); if (activeButton) { activeButton.style.animation = 'pulse 0.5s ease-in-out'; setTimeout(() => activeButton.style.animation = '', 500); activeButton.scrollIntoView({ behavior: 'smooth', block: 'center' }); } }, 100); } // ========== UTILITY FUNCTIONS ========== // Copy to clipboard function copyToClipboard(text) { navigator.clipboard.writeText(text).then(() => { showNotification('Copied to clipboard!', 'success'); }).catch(() => { // Fallback for older browsers const textArea = document.createElement('textarea'); textArea.value = text; document.body.appendChild(textArea); textArea.select(); document.execCommand('copy'); document.body.removeChild(textArea); showNotification('Copied to clipboard!', 'success'); }); } // Show error function showError(message) { showNotification(message, 'error'); } // Show notification toast function showNotification(message, type = 'success') { const toast = document.createElement('div'); toast.className = `toast ${type}`; toast.textContent = message; document.body.appendChild(toast); setTimeout(() => { toast.remove(); }, 3000); } // Show OTA section (dynamic) function showOTA() { const otaContainer = document.getElementById('otaContainer'); if (otaContainer && (otaContainer.style.display === 'none' || !otaContainer.style.display)) { otaContainer.style.display = 'block'; // Attention-grabbing pulse effect setTimeout(() => { const otaHeader = document.querySelector('.ota-header h3'); if (otaHeader) { otaHeader.style.animation = 'pulse 1s ease-in-out'; } }, 100); } } // Analytics tracking function trackEvent(eventName, data = {}) { if (typeof gtag !== 'undefined') { gtag('event', eventName, { 'event_category': TOOL_CONFIG.category, 'event_label': TOOL_CONFIG.name, ...data }); } } // ========== AI ASSISTANT FUNCTIONS ========== // AI 모달 열기 function openAIModal() { const modal = document.getElementById('aiModal'); if(modal) modal.classList.add('show'); // 현재 상태에 따라 적절한 화면 표시 if (aiModalState.apiKey && aiModalState.currentView === 'gemini') { showGeminiChat(); } else { showAISelector(); } updateAPIKeyStatus(); } // AI 모달 닫기 function closeAIModal() { const modal = document.getElementById('aiModal'); if(modal) modal.classList.remove('show'); // 300ms 후 상태 리셋 (애니메이션 완료 후) setTimeout(() => { aiModalState.currentView = 'selector'; showAISelector(); }, 300); } // AI 선택 화면 표시 function showAISelector() { document.getElementById('aiModalTitle').textContent = 'Choose Your AI Assistant'; document.getElementById('aiSelector').style.display = 'flex'; document.getElementById('geminiChat').style.display = 'none'; document.getElementById('apiKeySetup').style.display = 'none'; aiModalState.currentView = 'selector'; } // Gemini 채팅 화면 표시 function showGeminiChat() { document.getElementById('aiModalTitle').innerHTML = '✨ Gemini AI Assistant'; document.getElementById('aiSelector').style.display = 'none'; document.getElementById('geminiChat').style.display = 'flex'; document.getElementById('apiKeySetup').style.display = 'none'; aiModalState.currentView = 'gemini'; // 초기 메시지가 없으면 추가 const chatMessages = document.getElementById('chatMessages'); if (!chatMessages.innerHTML.trim()) { addMessage('assistant', `Hello! I can help you with DPI calculations: • Understanding print DPI vs monitor PPI • Gaming eDPI optimization • Image resolution planning • Print size calculations What would you like to know about DPI?`); } } // API 키 설정 화면 표시 function showAPIKeySetup() { document.getElementById('aiModalTitle').textContent = 'Setup Gemini API'; document.getElementById('aiSelector').style.display = 'none'; document.getElementById('geminiChat').style.display = 'none'; document.getElementById('apiKeySetup').style.display = 'block'; aiModalState.currentView = 'setup'; } // AI 선택 처리 function selectAI(aiType) { switch(aiType) { case 'chatgpt': const toolContext = `I need help with DPI calculations. This is a DPI Calculator tool for print resolution, gaming eDPI, monitor PPI on WIA Pin Code platform.`; const chatUrl = `https://chat.openai.com/?q=${encodeURIComponent(toolContext)}`; window.open(chatUrl, '_blank'); closeAIModal(); trackEvent('ai_selection', { ai_type: 'chatgpt' }); break; case 'claude': const claudeContext = `I need help with DPI calculations. This is a DPI Calculator tool for print resolution, gaming eDPI, monitor PPI on WIA Pin Code platform.`; const claudeUrl = `https://claude.ai/chat?q=${encodeURIComponent(claudeContext)}`; window.open(claudeUrl, '_blank'); closeAIModal(); trackEvent('ai_selection', { ai_type: 'claude' }); break; case 'gemini': if (!aiModalState.apiKey) { showAPIKeySetup(); } else { showGeminiChat(); } trackEvent('ai_selection', { ai_type: 'gemini' }); break; } } // API 키 저장 function saveGeminiApiKey() { const apiKey = document.getElementById('geminiApiKeyInput').value.trim(); if (apiKey) { localStorage.setItem('geminiApiKey', apiKey); aiModalState.apiKey = apiKey; showGeminiChat(); updateAPIKeyStatus(); } else { alert('Please enter a valid API key'); } } // API 키 상태 업데이트 function updateAPIKeyStatus() { const statusEl = document.getElementById('apiKeyStatus'); if (aiModalState.apiKey) { statusEl.innerHTML = 'Change API Key'; } else { statusEl.textContent = 'No API key set'; } } // 채팅 메시지 추가 function addMessage(type, content) { const chatMessages = document.getElementById('chatMessages'); const messageDiv = document.createElement('div'); messageDiv.className = `message ${type}`; if (type === 'user') { messageDiv.innerHTML = `You: ${content}`; } else { messageDiv.innerHTML = `✨ Gemini:
${content.replace(/\n/g, '
')}`; } chatMessages.appendChild(messageDiv); chatMessages.scrollTop = chatMessages.scrollHeight; } // Gemini에 메시지 전송 async function sendToGemini() { const input = document.getElementById('geminiInput'); const message = input.value.trim(); if (!message) return; // 사용자 메시지 추가 addMessage('user', message); input.value = ''; // 로딩 표시 const loadingMsg = document.createElement('div'); loadingMsg.className = 'message assistant'; loadingMsg.innerHTML = '✨ Gemini:
Thinking...'; loadingMsg.id = 'loading-message'; document.getElementById('chatMessages').appendChild(loadingMsg); try { const response = await fetch(`https://generativelanguage.googleapis.com/v1beta/models/gemini-pro:generateContent?key=${aiModalState.apiKey}`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ contents: [{ parts: [{ text: `Context: User is using DPI Calculator tool on WIA Pin Code platform. This tool calculates print DPI, monitor PPI, gaming eDPI, and DPI conversions. Current tab: ${currentTab} User question: ${message}` }] }], generationConfig: { temperature: 0.7, maxOutputTokens: 1000 } }) }); const data = await response.json(); // 로딩 메시지 제거 document.getElementById('loading-message').remove(); if (data.candidates && data.candidates[0] && data.candidates[0].content) { const reply = data.candidates[0].content.parts[0].text; addMessage('assistant', reply); } else { addMessage('assistant', 'Sorry, I could not generate a response. Please try again.'); } } catch (error) { // 로딩 메시지 제거 document.getElementById('loading-message')?.remove(); if (error.message.includes('API key')) { addMessage('error', 'Invalid API key. Please check your API key and try again.'); showAPIKeySetup(); } else { addMessage('error', 'Failed to connect to Gemini. Please check your internet connection and try again.'); } } } // ========== EVENT LISTENERS ========== document.addEventListener('DOMContentLoaded', function() { // Enter key support for inputs document.querySelectorAll('.input-field').forEach(input => { input.addEventListener('keypress', function(e) { if (e.key === 'Enter') { // Find the calculate button in the current active tab const activeTab = document.querySelector('.tab-content.active'); const calculateBtn = activeTab.querySelector('.btn'); if (calculateBtn) { calculateBtn.click(); } } }); }); // AI 버튼 이벤트 document.getElementById('aiBtn').addEventListener('click', openAIModal); // 모달 외부 클릭시 닫기 document.getElementById('aiModal').addEventListener('click', function(e) { if (e.target === this) { closeAIModal(); } }); // 엔터 키 지원 및 ESC 키로 모달 닫기 document.addEventListener('keydown', function(e) { if (e.key === 'Enter') { const geminiInput = document.getElementById('geminiInput'); if (document.activeElement === geminiInput) { sendToGemini(); } } // ESC 키로 모달 닫기 if (e.key === 'Escape') { closeAIModal(); } }); // 초기 API 키 상태 업데이트 updateAPIKeyStatus(); updateCurrentYear(); updateToolCount(); }); // Track WIA Pin Code clicks for analytics document.querySelectorAll('a[href*="wia"]').forEach(link => { link.addEventListener('click', function() { trackEvent('wia_link_click', { link: link.textContent }); }); }); // ========== DYNAMIC TOOL COUNT ========== // Update tool count dynamically async function updateToolCount() { try { const response = await fetch('/api/tool-count.php'); const data = await response.json(); // Update dynamic tools description document.querySelectorAll('.dynamic-tools-count').forEach(el => { el.textContent = `${data.count}+ free online tools in 211 languages. No signup, no fees, just tools that work.`; }); // Update "All X+ Tools" links document.querySelectorAll('.dynamic-count').forEach(el => { const prefix = el.getAttribute('data-text') || ''; const suffix = el.getAttribute('data-suffix') || ''; const icon = el.textContent.split(' ')[0] || ''; el.textContent = `${icon} ${prefix} ${data.count}+ ${suffix}`; }); } catch (error) { // Fallback: use current actual count from server const fallbackCount = 333; document.querySelectorAll('.dynamic-tools-count').forEach(el => { el.textContent = `${fallbackCount}+ free online tools in 211 languages. No signup, no fees, just tools that work.`; }); document.querySelectorAll('.dynamic-count').forEach(el => { const prefix = el.getAttribute('data-text') || ''; const suffix = el.getAttribute('data-suffix') || ''; const icon = el.textContent.split(' ')[0] || ''; el.textContent = `${icon} ${prefix} ${fallbackCount}+ ${suffix}`; }); console.log('Tool count API not available, using current count:', fallbackCount); } } // Update current year dynamically function updateCurrentYear() { const currentYear = new Date().getFullYear(); document.querySelectorAll('.current-year').forEach(el => { el.textContent = currentYear; }); } // ========== ANALYTICS ========== // Google Analytics window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'G-XXXXXXXXX'); // Track page view trackEvent('page_view', { tool: TOOL_CONFIG.name, category: TOOL_CONFIG.category });