{"id":3832,"date":"2025-12-11T15:17:19","date_gmt":"2025-12-11T15:17:19","guid":{"rendered":"https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/?p=3832"},"modified":"2025-12-12T10:15:43","modified_gmt":"2025-12-12T10:15:43","slug":"check-memory-usage-in-linux","status":"publish","type":"post","link":"https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/484\/check-memory-usage-in-linux.html","title":{"rendered":"How to Check Memory in Linux?"},"content":{"rendered":"\n<p>When you\u2019re managing a Linux server, whether it\u2019s for hosting a website, running applications, or handling development tasks, knowing how much memory your server is using is super important!<\/p>\n\n\n\n<p>It\u2019s just like you keep an eye on your phone\u2019s storage or battery usage; keeping track of your server\u2019s memory helps you understand its performance, avoid slowdowns, and troubleshoot issues quickly.<\/p>\n\n\n\n<p>Linux offers multiple built-in commands to check memory usage in real time, and the best part is that you don\u2019t need to install anything extra. With just a few simple commands, you can instantly see how much RAM is used, how much is free, and which processes are consuming the most memory.<\/p>\n\n\n\n<p>In this guide, let\u2019s walk through the easiest and most commonly used commands for checking memory in Linux, so even beginners can follow along.<\/p>\n\n\n\n<p><hr><p><strong>Also Read: How to Check CPU Usage in Linux?<\/strong><\/p><hr><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Simple Ways to Check Memory in Linux<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. Check Memory Using the free Command<\/strong><\/h3>\n\n\n\n<p>The <strong>free<\/strong> command is the easiest and most popular way to check RAM usage.<\/p>\n\n\n\n<p>\u2794 Firstly, open Terminal &amp; log in to your server via SSH or open your Linux terminal.<\/p>\n\n\n\n<p>\u2794 Then, you have to run the command given below.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><button class=\"copy-btn\" onclick=\"copyCommand(this)\">\ud83d\udccb<\/button><span class=\"copy-msg\">Copied!<\/span><table class=\"has-fixed-layout\"><tbody><tr><td class=\"kb_firewall\"><strong>free -h<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>What this shows:<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"658\" height=\"52\" src=\"https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/wp-content\/uploads\/2025\/12\/Check-Memory-Using-the-free-Command.png\" alt=\"Check Memory Using the free Command\" class=\"wp-image-3833\" srcset=\"https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/wp-content\/uploads\/2025\/12\/Check-Memory-Using-the-free-Command.png 658w, https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/wp-content\/uploads\/2025\/12\/Check-Memory-Using-the-free-Command-300x24.png 300w\" sizes=\"auto, (max-width: 658px) 100vw, 658px\" \/><\/figure>\n<\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>total \u2013<\/strong> Total server RAM<\/li>\n\n\n\n<li><strong>used<\/strong> \u2013 Memory currently in use<\/li>\n\n\n\n<li><strong>free <\/strong>\u2013 Memory not being used at all<\/li>\n\n\n\n<li><strong>shared<\/strong> \u2013 Memory used by the tmpfs fileserver (temporary files stored in RAM) and shared memory segments.<\/li>\n\n\n\n<li><strong>buff\/cache<\/strong> \u2013 Memory used for buffers and cache, which Linux uses to speed up server performance.<\/li>\n\n\n\n<li><strong>available<\/strong> \u2013 Memory available for new applications<\/li>\n<\/ul>\n\n\n\n<p>This is the quickest snapshot of your memory usage.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. Check Memory Usage Using \/proc\/meminfo<\/strong><\/h3>\n\n\n\n<p>Linux stores detailed memory stats inside a virtual file called <strong>\/proc\/meminfo<\/strong>.<\/p>\n\n\n\n<p>\u2794 You have to run the command below:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><button class=\"copy-btn\" onclick=\"copyCommand(this)\">\ud83d\udccb<\/button><span class=\"copy-msg\">Copied!<\/span><table class=\"has-fixed-layout\"><tbody><tr><td class=\"kb_firewall\"><strong>cat \/proc\/meminfo<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>What this shows:<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"229\" height=\"519\" src=\"https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/wp-content\/uploads\/2025\/12\/Check-Memory-Usage-Using-procmeminfo.png\" alt=\"Check Memory Usage Using proc meminfo\" class=\"wp-image-3834\" srcset=\"https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/wp-content\/uploads\/2025\/12\/Check-Memory-Usage-Using-procmeminfo.png 229w, https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/wp-content\/uploads\/2025\/12\/Check-Memory-Usage-Using-procmeminfo-132x300.png 132w\" sizes=\"auto, (max-width: 229px) 100vw, 229px\" \/><\/figure>\n<\/div>\n\n\n<p>This file gives very detailed memory information, such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>MemTotal<\/li>\n\n\n\n<li>MemFree<\/li>\n\n\n\n<li>Buffers<\/li>\n\n\n\n<li>Cached<\/li>\n\n\n\n<li>SwapTotal<\/li>\n\n\n\n<li>SwapFree<\/li>\n<\/ul>\n\n\n\n<p>This is useful if you want in-depth numbers beyond the introductory overview.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. Check Memory Usage in Real Time Using top<\/strong><\/h3>\n\n\n\n<p>The <strong>top<\/strong> command lets you continuously monitor memory.<\/p>\n\n\n\n<p>\u2794 You have to run the command below<\/p>\n\n\n\n<figure class=\"wp-block-table\"><button class=\"copy-btn\" onclick=\"copyCommand(this)\">\ud83d\udccb<\/button><span class=\"copy-msg\">Copied!<\/span><table class=\"has-fixed-layout\"><tbody><tr><td class=\"kb_firewall\"><strong>top<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>What this shows:<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"649\" height=\"89\" src=\"https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/wp-content\/uploads\/2025\/12\/Check-Memory-Usage-in-Real-Time-Using-top.png\" alt=\"Check Memory Usage in Real Time Using top\" class=\"wp-image-3835\" srcset=\"https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/wp-content\/uploads\/2025\/12\/Check-Memory-Usage-in-Real-Time-Using-top.png 649w, https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/wp-content\/uploads\/2025\/12\/Check-Memory-Usage-in-Real-Time-Using-top-300x41.png 300w\" sizes=\"auto, (max-width: 649px) 100vw, 649px\" \/><\/figure>\n<\/div>\n\n\n<ul class=\"wp-block-list\">\n<li>Total used\/free memory<\/li>\n\n\n\n<li>Memory being used by each running process<\/li>\n\n\n\n<li>Processes sorted automatically by resource usage<\/li>\n<\/ul>\n\n\n\n<p>This is ideal when you want to see which applications are consuming the most RAM right now.<\/p>\n\n\n\n<p><hr><p><strong>Also Read: <\/strong><a href=\"https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/481\/check-os-version-in-linux.html\"><strong>How to Check OS Version in Linux\u200b?<\/strong><\/a><\/p><hr><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. More Advanced Real-Time Monitoring with htop (If Installed)<\/strong><\/h3>\n\n\n\n<p><strong>htop<\/strong> is a more colourful, easy-to-read version of <strong>top<\/strong>.<\/p>\n\n\n\n<p>\u2794 You just have to run the simple command:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><button class=\"copy-btn\" onclick=\"copyCommand(this)\">\ud83d\udccb<\/button><span class=\"copy-msg\">Copied!<\/span><table class=\"has-fixed-layout\"><tbody><tr><td class=\"kb_firewall\"><strong>htop<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"81\" src=\"https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/wp-content\/uploads\/2025\/12\/Real-Time-Monitoring-with-htop-1024x81.png\" alt=\"Real-Time Monitoring with htop\" class=\"wp-image-3836\" srcset=\"https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/wp-content\/uploads\/2025\/12\/Real-Time-Monitoring-with-htop-1024x81.png 1024w, https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/wp-content\/uploads\/2025\/12\/Real-Time-Monitoring-with-htop-300x24.png 300w, https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/wp-content\/uploads\/2025\/12\/Real-Time-Monitoring-with-htop-768x61.png 768w, https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/wp-content\/uploads\/2025\/12\/Real-Time-Monitoring-with-htop.png 1102w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<p><strong>Benefits<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>It offers graphical memory bars.<\/li>\n\n\n\n<li>It offers easy navigation.<\/li>\n\n\n\n<li>It offers sorting processes using arrows.<\/li>\n<\/ul>\n\n\n\n<p>If it\u2019s not installed, you can install it using:<\/p>\n\n\n\n<p><strong>For Ubuntu\/Debian<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><button class=\"copy-btn\" onclick=\"copyCommand(this)\">\ud83d\udccb<\/button><span class=\"copy-msg\">Copied!<\/span><table class=\"has-fixed-layout\"><tbody><tr><td class=\"kb_firewall\"><strong>sudo apt install htop<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>For CentOS\/RHEL<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><button class=\"copy-btn\" onclick=\"copyCommand(this)\">\ud83d\udccb<\/button><span class=\"copy-msg\">Copied!<\/span><table class=\"has-fixed-layout\"><tbody><tr><td class=\"kb_firewall\"><strong>sudo yum install htop<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>5. Check Memory Usage Per Process Using ps<\/strong><\/h3>\n\n\n\n<p>If you want to see memory usage by specific processes, use:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><button class=\"copy-btn\" onclick=\"copyCommand(this)\">\ud83d\udccb<\/button><span class=\"copy-msg\">Copied!<\/span><table class=\"has-fixed-layout\"><tbody><tr><td class=\"kb_firewall\"><strong>ps aux &#8211;sort=-%mem<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"372\" height=\"451\" src=\"https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/wp-content\/uploads\/2025\/12\/Check-Memory-Usage-Per-Process-Using-ps.png\" alt=\"Check Memory Usage Per Process Using ps\" class=\"wp-image-3837\" srcset=\"https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/wp-content\/uploads\/2025\/12\/Check-Memory-Usage-Per-Process-Using-ps.png 372w, https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/wp-content\/uploads\/2025\/12\/Check-Memory-Usage-Per-Process-Using-ps-247x300.png 247w\" sizes=\"auto, (max-width: 372px) 100vw, 372px\" \/><\/figure>\n<\/div>\n\n\n<p><strong>What this does<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lists all running processes.<\/li>\n\n\n\n<li>Sorts them by highest memory usage first.<\/li>\n\n\n\n<li>Helps identify memory-hungry applications.<\/li>\n<\/ul>\n\n\n\n<p><hr><p><strong>Also Read: <\/strong><a href=\"https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/482\/check-os-kernel-version-in-linux.html\"><strong>How to Check OS Kernel Version in Linux\u200b?<\/strong><\/a><\/p><hr><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclusion<\/strong><\/h2>\n\n\n\n<p>Checking memory usage in Linux is simple once you know the right commands. Tools like <strong>free, top, htop, and \/proc\/meminfo<\/strong> give you everything from a quick summary to detailed breakdowns. Regular monitoring helps you understand your server\u2019s performance, troubleshoot issues faster, and plan upgrades effectively.<\/p>\n\n\n\n<p>Whether you are running a small website or managing large applications, keeping an eye on memory usage ensures your Linux server runs smoothly and efficiently.<\/p>\n\n\n<script>\nfunction copyCommand(btn) {\n  const td = btn.parentElement.querySelector(\"td.kb_firewall\");\n  const text = td.innerText.trim();\n\n  navigator.clipboard.writeText(text).then(() => {\n    const msg = btn.parentElement.querySelector(\".copy-msg\");\n    msg.style.display = \"inline-block\";\n    setTimeout(() => msg.style.display = \"none\", 1000);\n  });\n}\n<\/script>","protected":false},"excerpt":{"rendered":"<p>When you\u2019re managing a Linux server, whether it\u2019s for hosting a website, running applications, or handling development tasks, knowing how much memory your server is using is super important! It\u2019s just like you keep an eye on your phone\u2019s storage or battery usage; keeping track of your server\u2019s memory helps you understand its performance, avoid [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49],"tags":[],"class_list":["post-3832","post","type-post","status-publish","format-standard","hentry","category-vps"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Check Memory in Linux?<\/title>\n<meta name=\"description\" content=\"Learn how to check memory in Linux using simple commands that explain each method to help you monitor RAM usage and optimize the server.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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