How much RAM does my Mac have?
Any of these shows it, on macOS 15 Sequoia, macOS 26 Tahoe and macOS 27 alike:
- About This Mac: choose Apple menu › About This Mac. Apple says the window shows "the macOS version, type of processor or chip, and amount of memory" (Apple, What's in the Apple menu).
- System Settings: choose Apple menu › System Settings, click General, then About. The Memory row "shows the amount of total memory in your Mac" (Apple, View About settings).
- System Information: hold Option, choose Apple menu › System Information, then click Memory under Hardware (Apple, Get system information about your Mac). On our MacBook Pro it read: Memory: 32 GB, Type: LPDDR5, plus the manufacturer.
On a Mac with Apple silicon, this is unified memory. Apple describes it as a single pool of memory that lets the parts of the chip "access the same data without copying it between multiple pools of memory" (Apple Newsroom). In practice, the graphics share the same memory as your apps, so graphics-heavy work uses it too.
How to check RAM usage in Activity Monitor
Open Activity Monitor (press Command-Space, type "Activity Monitor") and click Memory. Two places matter.
The list shows each process's memory. Click the Memory column heading to put the biggest at the top. Your browser's tabs appear as separate processes (Chrome's as Google Chrome Helper (Renderer), Safari's as WebKit processes), so add them up when you judge a browser. View › Columns adds more detail, such as how much of each process has been compressed.
The summary at the bottom, as Apple defines it (Apple, View memory usage):
| Figure | Apple's definition | How to read it |
|---|---|---|
| Physical Memory | "The amount of RAM installed." | Fixed |
| Memory Used | "The amount of RAM being used." | Near the total is normal |
| Cached Files | Files "cached by the system into unused memory to improve performance" | Given back as soon as apps need it |
| Swap Used | Space "on your startup disk to swap unused files to and from RAM" | Some is normal; growing fast is not |
| Memory Pressure | "determined by the amount of free memory, swap rate, wired memory, and file cached memory" | The one to watch |
Activity Monitor on Mac goes through App Memory, Wired and Compressed and the other tabs.
Check RAM from Terminal
All of these only read, need no password, and worked the same way on our MacBook Pro (M2 Max, 32 GB, macOS 27.0.1).
Installed memory, in bytes:
sysctl hw.memsizeIt printed hw.memsize: 34359738368, which is 32 GB (32 × 1,024 × 1,024 × 1,024 bytes). system_profiler SPMemoryDataType gives the same in words, with the memory type.
A one-line summary of use:
top -l 1 -s 0 | grep PhysMemIt printed PhysMem: 31G used (4188M wired, 13G compressor), 121M unused. That reads: 31 GB in use, of which about 4 GB is wired (memory macOS must keep in RAM) and 13 GB is held by the memory compressor, with almost nothing unused. "Unused" near zero is normal; the compressor figure that large is the sign this Mac was working hard.
Memory pressure as a percentage:
memory_pressureRun it with no options. It lists page counts and ends with a line such as System-wide memory free percentage: 45%. Its manual page describes it as a "tool to apply real or simulate memory pressure on the system", and its options do exactly that, so don't add any.
Swap in use:
sysctl vm.swapusageOurs showed total = 18432.00M used = 17533.19M. vm_stat gives the raw counts behind all of this, in pages; on our Mac its first line said each page is 16,384 bytes, so multiply by that to get bytes.
What's normal, and what isn't
| What you see | What it means | What to do |
|---|---|---|
| Pressure green, Memory Used near the total | macOS is using spare memory as cache | Nothing |
| Pressure yellow now and then | Short of memory at busy moments; Apple says the Mac "might eventually need more RAM" | Quit what you aren't using at those moments |
| Pressure red, swap growing | Apple: "Your computer needs more RAM" for what's running | Free up memory now |
| One process far bigger than the rest, and growing | Probably a bug in that app or page | Quit it and update it |
| "Your system has run out of application memory" | Memory and swap are exhausted | See what to do |
Apple's color meanings are from Check if your Mac needs more RAM, which also notes that free or unused memory doesn't necessarily make a Mac faster.
How much RAM do you need on a Mac?
The most reliable answer comes from your own Mac, not a chart. Leave Activity Monitor's Memory tab open, or glance at it, during a normal working week with the apps you really use. If Memory Pressure stays green, you have enough. If it's yellow at busy moments, you're at the edge. If it's yellow or red most days and swap keeps growing, your next Mac should have more.
Some reference points Apple publishes:
- Apple's own starting memory: in October 2024 Apple said MacBook Air "now starts at 16GB" (Apple Newsroom). MacBook Neo, launched in March 2026, has 8 GB of unified memory with no larger option (Apple, MacBook Neo tech specs).
- Pro apps: Apple lists Final Cut Pro as needing "8GB of memory (16GB recommended)" (Apple, Final Cut Pro).
The figure to buy matters because it's final. Apple says memory in Mac mini and iMac models with Apple silicon "can't be upgraded", and that Apple laptops not in its upgrade table "have non-removable memory" (Apple, Mac mini; iMac; MacBook Pro). So size it for the work you expect over the years you'll keep the Mac, using what your current Mac's pressure graph tells you.
How Tend helps
Tend's free Memory page, in Advanced view, says in plain words whether memory is comfortable or under pressure, and shows the breakdown (app memory, wired, compressed, cached files and free), swap used, a short history graph and the apps using the most memory. Energy & Apps, also free, lists each app's memory next to its CPU and estimated watts.
Questions
How do I check how much RAM my Mac has?
Choose Apple menu › About This Mac, which shows the amount of memory. You can also open System Settings › General › About and look at the Memory row, or hold Option and choose Apple menu › System Information, then Memory.
How do I check RAM usage on a Mac?
Open Activity Monitor, click Memory, and read the Memory Pressure graph at the bottom. Sort the list by the Memory column to see which apps use the most. In Terminal, top -l 1 -s 0 | grep PhysMem prints a one-line summary.
Why is my Mac using so much RAM?
Because macOS keeps recently used files in spare memory to make things faster, so Memory Used is often close to the total. That's normal. Only worry if the Memory Pressure graph is yellow or red, or one app keeps growing.
How much RAM do I need on a Mac?
Enough that Memory Pressure stays green during your normal week. Apple's MacBook Air has started at 16 GB since October 2024, and Apple recommends 16 GB for Final Cut Pro. Memory on Apple silicon Macs can't be upgraded later, so judge it before you buy.
Can I add more RAM to my Mac?
Not on a Mac with Apple silicon. Apple says the memory is integrated into the chip package on Mac mini and iMac models and is non-removable on its laptops, so the amount is chosen when you buy the Mac.
Related guides
How to clear RAM on a Mac, and when you shouldn't bother
Free up memory when pressure is high
“Your system has run out of application memory” on Mac
When memory runs out completely
Activity Monitor on Mac: how to open it and read each tab
Every Activity Monitor tab explained
Why is my Mac so slow? How to find the cause and fix it
When memory isn't the cause
More detailed guides:
Sources
- Apple, What's in the Apple menu on Mac?, View About settings on Mac and Get system information about your Mac (macOS 15, 26 and 27)
- Apple, View memory usage in Activity Monitor on Mac and Check if your Mac needs more RAM
- Apple Newsroom, Apple unleashes M1 (unified memory) and New MacBook Pro features M4 family of chips and Apple Intelligence (MacBook Air at 16GB)
- Apple, MacBook Neo tech specs and Final Cut Pro requirements
- Apple, Upgrade or install memory in your Mac mini, Install memory in an iMac and MacBook Pro: How to remove or install memory
- Apple,
man memory_pressureandman vm_stat; every command run on a MacBook Pro with M2 Max and 32 GB, macOS 27.0.1
See your Mac's memory in plain words
Tend is free to download. Pro is $1.99 a month, $12.99 a year with a 7-day free trial, or $29.99 once.