How much storage do you need on a MacBook? Work it out from what you have now
Do not guess from the price list. Measure what your current computer holds, add for growth, and pick the size that leaves 20 percent free after three years.
Mac storage cannot be upgraded after you buy it. The internal disk is part of the main board. So this one decision stays with you for the life of the machine, and the cheapest way to get it right is to measure what you use today.
Step 1: measure what you use now
# Used space on your current Mac
df -h /System/Volumes/Data
# The biggest folders in your home
du -sh ~/* 2>/dev/null | sort -h | tail -8On a Windows PC, right-click the C drive and choose Properties. Note the used figure, and how much of it is photos and video.
Step 2: add for growth
| How you use a computer | Growth per year, roughly |
|---|---|
| Browsing, email, documents | 5 to 15 GB |
| Phone photos synced with iCloud, optimized | 10 to 30 GB |
| Photos kept at full size on the Mac | 30 to 100 GB |
| Software development | 30 to 100 GB |
| Video editing | Hundreds of GB, better on an external drive |
Step 3: leave 20 percent free
A Mac that is nearly full slows down and struggles with updates. How much free space a Mac should have explains why. So the size you need is roughly: (used now + three years of growth) divided by 0.8.
What that gives for common cases
| You | Suggested size |
|---|---|
| Student, mostly browser and documents | 256 GB, with iCloud or a USB drive for photos |
| Everyday user with a growing photo library | 512 GB |
| Developer, or anyone running a few large apps | 512 GB to 1 TB |
| Photographer or video editor | 1 TB or more, plus an external SSD |
Remember that macOS itself takes a fixed share of every Mac, covered in how much space macOS takes, and a Mac advertised as 256 GB shows a little less. See why a 256 GB Mac shows less.
When a smaller disk is fine
If you already use iCloud Photos with Optimize Mac Storage, keep media on a NAS or external drive, or mainly work in a browser, 256 GB can work well. 256 GB versus 512 GB goes through that choice in detail.
Common questions
How much storage should I get on a MacBook?
Measure what your current computer uses, add a few years of growth, and choose a size that keeps about 20 percent free. For most everyday users that is 512 GB.
Can I upgrade MacBook storage later?
No. The storage is part of the main board on current Macs. You can add an external drive, but the internal size is fixed.
Is 256 GB enough for a MacBook?
For browsing, documents and photos kept in iCloud, often yes. For large photo libraries, development or video, 512 GB or more saves trouble.