---
id: freeing-space.how-is-freed-space-measured-after-run-tuhi
url: https://storagestudio.us/faq/freeing-space/how-is-freed-space-measured-after-run-tuhi
category: "Freeing up space"
subcategory: "One-tap clean-up (Run Tuhi)"
question: "How does Storage Studio work out how much space a Run Tuhi clean-up freed?"
alt_questions:
  - "Is the freed figure after Tuhi accurate?"
  - "Why does Tuhi's freed number match the chart?"
  - "How is 'freed' calculated in Storage Studio?"
  - "Tuhi says it freed less than I expected"
  - "Is the freed amount an estimate?"
short_answer: "Storage Studio measures your Mac's free space just before and just after the run and reports the difference — the same figure the storage chart shows — rather than adding up estimates."
tags: ["freed space", "run tuhi", "measurement"]
related: ["https://storagestudio.us/faq/freeing-space/why-are-old-local-backups-reported-separately", "https://storagestudio.us/faq/freeing-space/why-did-free-space-go-down-after-a-clean-up"]
applies_to: "all"
last_reviewed: 2026-10-01
---

# How does Storage Studio work out how much space a Run Tuhi clean-up freed?

It's measured, not added up from guesses. Storage Studio reads your Mac's free space just before the first step and again just after the last, and reports the difference — the same free-space figure the storage chart and the popover show, so the two can't disagree.

That means anything that genuinely leaves your built-in drive (deleted caches, folders moved to your fast drive) is counted, and anything that only reshuffles space your Mac already treated as available isn't. If you were saving files during the run, the result reflects that too.

Old local backups that were tidied are reported on a separate line — see [why they aren't counted as freed](https://storagestudio.us/faq/freeing-space/why-are-old-local-backups-reported-separately).