BLU-RAY REMUX SIZE
Estimate Blu-ray remux size from bitrate, runtime, and selected tracks.
There is no universal Blu-ray remux size. For a source you are authorized to process and can already read, use the finished title's overall bitrate and runtime: estimated decimal GB ≈ Mbps × hours × 0.45. A 35 Mbps, two-hour selection is about 31.5 GB by arithmetic before small container differences. Check the real output because the movie, bitrate, runtime, selected audio and subtitle tracks, and source format all vary. Blu-ray's 25/50 GB and Ultra HD Blu-ray's 66/100 GB capacities are media limits, not promises for one remux file, while MakeMKV's 30 GB figure is a vendor's typical example rather than a guaranteed average.
This guide begins after lawful source access. It does not provide decryption keys, drive firmware changes, downloads, or instructions for bypassing Blu-ray access controls.
A remux keeps selected encoded media streams instead of re-encoding them. Its size therefore follows the actual streams and runtime, not the words MKV, 1080p, or 4K by themselves.
Treat source-disc capacity, a vendor's typical example, a bitrate calculation, and usable storage as four different numbers. They answer different questions and should not be substituted for one another.
Plan a collection from representative outputs you created from sources you may process. Do not multiply one movie's size across a library whose runtimes, bitrates, formats, and track selections differ.
The facts below come from current official documentation and transparent arithmetic. Bluraysoftware has not performed a disc, drive, remux-speed, image-quality, NAS, or playback test for this page.
GOOD FIT
This page is for you if...
- People who have chosen a stream-preserving MKV workflow and need a storage estimate before processing an authorized source.
- Collectors comparing one movie, a planned batch, and the usable capacity of a local drive or NAS.
- Users deciding whether to retain several audio and subtitle tracks or create a smaller encoded derivative.
- Anyone who wants to replace a fixed 'GB per movie' guess with a repeatable bitrate-and-runtime calculation.
CHOOSE ANOTHER PATH
It is not the right starting point if...
- Instructions for decrypting a protected commercial disc, supplying keys, changing drive firmware, or bypassing access controls.
- A promise that every Blu-ray remux, UHD remux, MKV, or movie has the same size.
- A full-disc ISO or BDMV backup estimate; menus, extras, duplicate material, and disc structure make that a different storage task.
- A product ranking, a Plex client-compatibility guide, or a guarantee that a NAS can transcode the selected streams.
BEFORE CHOOSING SOFTWARE
Confirm the prerequisites first.
A software match is useful only when the source, hardware, operating system, and destination also match.
- 01
A permitted, readable source
Use material you are authorized to process and confirm that an upstream tool can already read it without relying on this page for an access-control workaround.
- 02
The actual title and runtime
Identify the feature or episode you intend to keep. Disc capacity includes material that may not belong in that selected output.
- 03
A track plan
List the video, main audio, alternate languages, commentary, subtitles, chapters, and accessibility tracks that should remain.
- 04
A bitrate source
Use overall bitrate from a completed representative file or add the selected stream bitrates when reliable metadata is available. Do not estimate from resolution alone.
- 05
Usable destination capacity
Read the capacity available to the volume after RAID, system partitions, filesystem metadata, snapshots, and other data rather than using only the drive labels.
DECISION TABLE
Match the tool to the job.
Start with the row that describes the desired result, then complete the verification step before paying.
| Your priority | Start with | Why | Verify before choosing |
|---|---|---|---|
| Estimate one remux before it exists | Overall Mbps × runtime in hours × 0.45 | Dividing megabits by eight and converting a 3,600-second hour to decimal gigabytes gives the 0.45 factor. For example, 35 Mbps × 2 hours × 0.45 is about 31.5 decimal GB. | The bitrate represents all selected streams, the runtime is the intended title, units are Mbps and decimal GB, and the finished file is compared with the estimate. |
| Avoid treating disc capacity as output size | Use 25/50 GB and 66/100 GB only as media-capacity context | The Blu-ray Disc Association lists 25 and 50 GB for standard Blu-ray and 66 and 100 GB for Ultra HD Blu-ray. A selected-title remux can omit menus, extras, and unneeded tracks, so those capacities do not predict one file. | Standard Blu-ray and physical Ultra HD Blu-ray are labeled separately, the source edition is known, and the number is not presented as a typical remux range. |
| Decide which tracks are worth their space | Keep the required video, audio, subtitles, metadata, and chapters | MakeMKV says its MKV output can preserve selected video and audio tracks, metadata, and chapters without changing the streams. Each retained stream contributes data, while dropping a stream is not the same as re-encoding the video. | Main audio, alternate languages, commentary, accessibility audio, full and forced subtitles, chapters, and labels are correct before removing anything. |
| Plan a collection rather than one movie | Measure several representative lawful outputs | A real library mixes short and long titles, standard Blu-ray and UHD, different bitrates, and different track policies. Representative finished files give a more defensible range than one vendor example. | Samples cover the formats and runtimes you actually own, totals use their real file sizes, outliers remain visible, and planned additions are calculated separately. |
| Size a NAS or RAID volume | Use the storage system's current usable capacity | Synology notes that RAID layout, reserved system space, filesystem metadata, and volume creation reduce what can store files. Raw drive labels or a RAID calculator estimate are not the final usable number. | Current free and usable capacity, RAID layout, metadata, snapshots, other workloads, an independent backup, and room for the source plus temporary output during verification. |
| Reduce storage after measuring the tradeoff | Create an encoded derivative only when the budget requires it | Re-encoding can reduce bitrate and size but changes the source streams, consumes processing time, and creates a quality and compatibility decision. It is not a smaller remux. | Codec, quality target, HDR behavior, audio and subtitle handling, encode time, destination playback, and whether a preservation copy remains available. |
FINAL CHECK
Before you download or pay.
Use this short list to catch edition, platform, and marketing-label mismatches.
- I am authorized to process the source, and this guide is not being used to bypass access controls.
- I identified the exact title and runtime rather than multiplying the whole disc capacity.
- I know which video, audio, subtitle, chapter, and metadata streams will remain.
- My estimate uses overall Mbps, hours, and decimal GB consistently.
- I will compare the first completed file with the estimate before scaling the collection.
- I separated standard Blu-ray capacity from physical Ultra HD Blu-ray capacity.
- I used current usable storage after RAID, metadata, snapshots, and existing files rather than raw drive labels.
- I kept verification space and an independent backup outside the only working volume.
- If I encode a smaller derivative, I will test quality, HDR, audio, subtitles, and playback separately.
FAQ
Questions to settle before choosing.
How big is a Blu-ray remux?
There is no single size. Use the selected title's overall bitrate and runtime: decimal GB ≈ Mbps × hours × 0.45, then verify the finished output. Track selection, runtime, source bitrate, and whether the source is standard Blu-ray or Ultra HD Blu-ray all matter.
Why is my Blu-ray remux larger or smaller than 30 GB?
MakeMKV lists 30 GB only as a typical Blu-ray movie example. A specific title can differ because of runtime, video bitrate, selected audio and subtitles, and source format. Treat 30 GB as a vendor planning example, not a promised average.
Can I use 25 GB or 50 GB as the expected remux size?
No. Those are standard Blu-ray media capacities. The disc can also contain menus, extras, several titles, and tracks you do not select. Use the actual selected streams and runtime for the file estimate.
How do I calculate remux size from bitrate?
For decimal gigabytes, multiply overall Mbps by runtime in hours and by 0.45. A 35 Mbps, two-hour selection is about 31.5 GB. Use overall bitrate or a reliable sum of the selected streams, and compare the result with the completed file.
Does removing audio or subtitles reduce a remux file?
Removing an unneeded stream removes its data without re-encoding the retained video. The saving depends on that stream's bitrate and duration, so inspect the actual track information rather than assuming every language or subtitle has the same cost.
How much NAS space should I buy for a remux library?
Build a range from several representative finished files, multiply by the planned count in each source class, and compare it with the NAS volume's current usable capacity. Account separately for RAID, metadata, snapshots, other data, verification space, growth, and an independent backup; do not use raw drive labels alone.
Is an encoded MKV still a remux?
Not in the storage decision used here. A remux preserves selected encoded streams without re-encoding them. An encoded MKV creates new video or audio at a chosen bitrate and should be planned and quality-checked as a different output.
Does this guide explain how to decrypt a commercial Blu-ray?
No. It starts with material you are authorized to process and that an upstream tool can already read. It does not provide keys, firmware changes, downloads, or access-control bypass instructions.
REFERENCESEvidence and official sources7 guide references
Guide-level technical claims use the first-party references below. Product matches use catalog evidence from official product pages. These are editorial source checks, not hands-on performance testing. A checked date is a snapshot, not a promise that the source has not changed.
Guide references
- Blu-ray Disc Association: Standard Blu-ray Capacity ↗The Blu-ray Disc Association lists 25 GB for single-layer and 50 GB for dual-layer standard Blu-ray media. These are media capacities, not one selected-title remux estimate.Checked Oct 23, 2026
- Blu-ray Disc Association: Ultra HD Blu-ray Capacity ↗The association lists 66 GB dual-layer and 100 GB triple-layer Ultra HD Blu-ray media, which must remain separate from standard Blu-ray and from an output-size promise.Checked Oct 23, 2026
- Blu-ray Disc Association Japan: Physical Specifications ↗The association's Japanese specification page lists 25/50 GB and 66/100 GB BD-ROM physical capacities. The preceding English BDA source, not this line alone, establishes the Ultra HD attribution.Checked Oct 23, 2026
- MakeMKV: Product Overview ↗MakeMKV states that its MKV output preserves selected video and audio tracks, metadata, and chapters without changing the media streams. This is a vendor statement, not a Bluraysoftware hands-on test.Checked Oct 23, 2026
- MakeMKV: Download and System Requirements ↗MakeMKV's system requirements call 30 GB a typical Blu-ray movie. The page uses this only as a vendor example and does not treat it as a guaranteed range.Checked Oct 23, 2026
- Plex: Investigate Media Information and Formats ↗Plex documents overall bitrate plus video, audio, and subtitle stream properties in media information, providing fields that can support a file-specific estimate and later verification.Checked Oct 23, 2026
- Synology: RAID Calculator ↗Synology explains that reserved system capacity and filesystem metadata reduce the actual storage available after RAID and directs users to the real volume for the current available amount.Checked Oct 23, 2026