{"id":"mac-storage-basics.how-much-free-space-should-i-keep-on-a-mac","url":"/faq/mac-storage-basics/how-much-free-space-should-i-keep-on-a-mac","category":{"id":"mac-storage-basics","title":"Mac storage basics"},"subcategory":{"id":"storage-overview","title":"Checking your storage"},"question":"How much free space should I keep on my Mac?","alt_questions":["recommended free space mac","how full can my mac ssd be","minimum free space macos","is it bad to fill mac ssd","how much storage should be free on macbook","percentage of disk to leave empty mac"],"short_answer":"Keep roughly 10–15% of the drive free. macOS needs room for virtual memory, snapshots and especially system updates; running near full causes slowdowns and failed updates.","answer_markdown":"Leave a comfortable margin — roughly 10–15% of the drive, and never less than a few tens of gigabytes on a small drive. macOS needs room for virtual memory, caches, local snapshots and, above all, system updates, which unpack and need much more space than their download size.\n\nThe tighter you run, the more you'll see slowdowns, failed updates and apps that can't save. A percentage is a better guide than a fixed number: 25 GB free is plenty on some Macs and very tight on a 256 GB one.\n\nStorage Studio warns based on how fast space is disappearing and how much is left, rather than a fixed threshold, and its Emergency Space screen is there when you're nearly out. See [freeing up space](/faq/freeing-space/).","answer_html":"

Leave a comfortable margin — roughly 10–15% of the drive, and never less than a few tens of gigabytes on a small drive. macOS needs room for virtual memory, caches, local snapshots and, above all, system updates, which unpack and need much more space than their download size.

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The tighter you run, the more you'll see slowdowns, failed updates and apps that can't save. A percentage is a better guide than a fixed number: 25 GB free is plenty on some Macs and very tight on a 256 GB one.

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Storage Studio warns based on how fast space is disappearing and how much is left, rather than a fixed threshold, and its Emergency Space screen is there when you're nearly out. See freeing up space.

","answer_text":"Leave a comfortable margin — roughly 10–15% of the drive, and never less than a few tens of gigabytes on a small drive. macOS needs room for virtual memory, caches, local snapshots and, above all, system updates, which unpack and need much more space than their download size.\n\nThe tighter you run, the more you'll see slowdowns, failed updates and apps that can't save. A percentage is a better guide than a fixed number: 25 GB free is plenty on some Macs and very tight on a 256 GB one.\n\nStorage Studio warns based on how fast space is disappearing and how much is left, rather than a fixed threshold, and its Emergency Space screen is there when you're nearly out. See freeing up space.","tags":["free space","performance","updates"],"related":[{"id":"mac-storage-basics.how-much-free-space-does-a-macos-update-need","question":"How much free space do I need to install a macOS update?","url":"/faq/mac-storage-basics/how-much-free-space-does-a-macos-update-need"}],"applies_to":"all","last_reviewed":"2026-10-01","title":"How much free space should I keep on my Mac? — Storage Studio FAQ","description":"Keep roughly 10–15% of the drive free. macOS needs room for virtual memory, snapshots and especially system updates; running near full causes slowdowns and failed updates.","crumbs":[{"name":"Home","path":"/"},{"name":"FAQ","path":"/faq/"},{"name":"Mac storage basics","path":"/faq/mac-storage-basics/"},{"name":"How much free space should I keep on my Mac?","path":"/faq/mac-storage-basics/how-much-free-space-should-i-keep-on-a-mac"}],"jsonld":{"@context":"https://schema.org","@type":"FAQPage","url":"https://storagestudio.us/faq/mac-storage-basics/how-much-free-space-should-i-keep-on-a-mac","inLanguage":"en","dateModified":"2026-10-01","mainEntity":[{"@type":"Question","name":"How much free space should I keep on my Mac?","alternateName":["recommended free space mac","how full can my mac ssd be","minimum free space macos","is it bad to fill mac ssd","how much storage should be free on macbook","percentage of disk to leave empty mac"],"acceptedAnswer":{"@type":"Answer","text":"Leave a comfortable margin — roughly 10–15% of the drive, and never less than a few tens of gigabytes on a small drive. macOS needs room for virtual memory, caches, local snapshots and, above all, system updates, which unpack and need much more space than their download size.\n\nThe tighter you run, the more you'll see slowdowns, failed updates and apps that can't save. A percentage is a better guide than a fixed number: 25 GB free is plenty on some Macs and very tight on a 256 GB one.\n\nStorage Studio warns based on how fast space is disappearing and how much is left, rather than a fixed threshold, and its Emergency Space screen is there when you're nearly out. See freeing up space.","url":"https://storagestudio.us/faq/mac-storage-basics/how-much-free-space-should-i-keep-on-a-mac"}}]},"fragment":"
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Mac storage basics · Checking your storage

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How much free space should I keep on my Mac?

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Short answer: Keep roughly 10–15% of the drive free. macOS needs room for virtual memory, snapshots and especially system updates; running near full causes slowdowns and failed updates.

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Leave a comfortable margin — roughly 10–15% of the drive, and never less than a few tens of gigabytes on a small drive. macOS needs room for virtual memory, caches, local snapshots and, above all, system updates, which unpack and need much more space than their download size.

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The tighter you run, the more you'll see slowdowns, failed updates and apps that can't save. A percentage is a better guide than a fixed number: 25 GB free is plenty on some Macs and very tight on a 256 GB one.

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Storage Studio warns based on how fast space is disappearing and how much is left, rather than a fixed threshold, and its Emergency Space screen is there when you're nearly out. See freeing up space.

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Last reviewed

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Related questions

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