Where to find your memory amount in Windows
Open the Start menu and type System Information into the search box, then click the result. A window will open showing details about your computer. Look for the line labeled Installed RAM — this is your memory amount, shown in gigabytes (GB). This is the fastest way to find the number.
If you prefer a different route, right-click This PC or My Computer on your desktop, then select Properties. Scroll down until you see Installed RAM listed under the Device specifications section. Both methods show the same information.
Write down the number you see. You will need it later if you decide to add more memory or if you are troubleshooting why your computer feels slow.
Where to find your memory amount on Mac
Click the Apple menu in the top-left corner of your screen, then select About This Mac. A window will appear when ready showing your memory amount at the top, listed as Memory in gigabytes (GB).
That single window tells you everything you need to know about your RAM. Macs do not hide this information in multiple places the way Windows does, so you will have your answer in seconds.
Key Takeaways
- On Windows, open System Information from the Start menu and look for the line labeled Installed RAM to see your total memory in gigabytes.
- On Mac, click the Apple menu and select About This Mac to see your memory amount displayed at the top of the window.
- Memory is measured in gigabytes (GB), and most computers made in the last five years have between 4 GB and 16 GB.
- Knowing your memory amount helps you understand whether your computer can handle the programs you use or whether adding more would help it run faster.
Understanding what the number means
The number you found is your RAM, which stands for Random Access Memory. This is the working space your computer uses while programs are running — it is different from storage space (your hard drive or SSD). Think of RAM as your desk and your hard drive as your filing cabinet. A larger desk lets you spread out more papers and work faster.
Most computers sold today come with 8 GB or 16 GB of RAM. If your computer shows 4 GB or less, it will struggle when you run multiple programs at once or use programs that demand a lot of memory, like video editing software or modern web browsers with many tabs open.
If your computer shows 32 GB or more, you have more memory than most people need for everyday tasks like email, web browsing, and document editing. That amount is usually for people who work with video, 3D design, or large databases.
Why memory matters when your computer feels slow
When your computer runs out of available RAM, it starts using your hard drive as temporary memory instead. Your hard drive is much slower than RAM, so this slowdown is noticeable — programs freeze, switching between windows takes time, and opening new tabs in your browser becomes sluggish.
If you checked your memory and found it is low (4 GB or less), and your computer feels slow when you have several programs open, adding more RAM could make a real difference. However, if you have 8 GB or more and your computer is still slow, the problem is usually something else — a full hard drive, too many programs running at startup, or malware.
How to check what is using your memory right now
On Windows, press Ctrl + Shift + Esc to open Task Manager directly. Click the Performance tab, then select Memory from the left sidebar. You will see a graph showing how much of your total RAM is in use right now. Below the graph, you can see which programs are using the most memory.
On Mac, open Spotlight by pressing Command + Space, type Activity Monitor, and press Enter. Click the Memory tab. You will see a list of programs and how much memory each one is using. The programs at the top of the list are using the most.
Checking this occasionally helps you understand whether your memory is actually the problem. If you see that you are only using 3 GB out of 8 GB available, and your computer is still slow, then memory is not the issue.
The difference between memory and storage
Many people confuse memory (RAM) with storage space (your hard drive or SSD). They are completely different things. Memory is temporary — it clears when you shut down your computer. Storage is permanent — files stay there until you delete them.
When you check your memory using System Information or About This Mac, you are seeing RAM. When you check how much space you have left on your hard drive (by opening File Explorer on Windows or Finder on Mac and looking at your main drive), you are seeing storage. Both numbers matter for computer performance, but they affect your computer in different ways.
Frequently Asked Questions
Can I add more memory to my computer?
On most desktop computers, yes — you can open the case and install additional RAM modules yourself or have a technician do it. On laptops, it depends on the model. Some laptops have RAM soldered to the motherboard and cannot be upgraded, while others have removable RAM. Check your computer's manual or search for your specific model online to find out whether yours can be upgraded.
What if System Information shows different memory amounts in different places?
Windows sometimes shows installed RAM in one place and usable RAM in another. Usable RAM is slightly less than installed RAM because the operating system reserves a small amount for itself. The installed amount is the true total. If the difference is large (more than 1 GB), you may have a hardware problem and should contact a technician.
Is 8 GB enough memory for everyday use?
For most people doing email, web browsing, document editing, and video streaming, 8 GB is enough. If you regularly work with large files, run many programs at once, or use memory-intensive software, 16 GB is more comfortable. If you only do light tasks, 4 GB can work, but you will notice slowdowns when you open multiple browser tabs.
Why does my computer show less usable memory than installed memory?
Windows reserves a small amount of RAM for the operating system and hardware drivers. You might see 7.9 GB usable out of 8 GB installed, or 15.9 GB out of 16 GB installed. This is normal and not a problem. The difference is usually less than 1 GB.
Does restarting my computer free up memory?
Yes. When you restart, all programs close and RAM clears completely. If your computer feels slow and you have many programs open, restarting often helps. However, if slowness returns quickly after restart, the problem is likely not memory — it is something else running in the background or a storage issue.