DVD Capacity: DVD-5, DVD-9, DVD-10 & DVD-18 Storage Sizes

A standard single-layer DVD holds 4.7 GB, while a single-sided dual-layer DVD holds about 8.5 GB. Double-sided formats can reach 9.4 GB with one layer per side or about 17 GB with two layers per side. If a computer shows a smaller-looking number, check the unit first: 4.7 GB is about 4.38 GiB, so the bytes have not disappeared.

DVD Capacity at a Glance

The amount of data a DVD can hold depends mainly on its layers and usable sides. A standard 120 mm disc can have one or two recording layers on a side, and some DVD types use both sides of the disc.

DVD-10 combines two single-layer sides, while DVD-18 combines two dual-layer sides. DVD-14 uses one single-layer side and one dual-layer side. The additional capacity comes from extra layers or the second side rather than a larger disc diameter.

If by "DVD size" you mean the diameter, thickness, or case dimensions instead of storage space, see the separate guide to DVD and DVD case dimensions. Physical dimensions and storage capacity are different measurements.

Why Does a 4.7 GB DVD Show About 4.38 GiB?

A DVD labeled 4.7 GB contains about 4.7 billion bytes. The smaller-looking number comes from expressing the same bytes with a binary unit instead of the decimal unit printed on the disc.

Formatting and file-system overhead can also affect how much space is available for user files, but that is separate from the GB/GiB conversion. If a blank DVD appears smaller than its label, check the displayed unit before assuming capacity is missing.

DVD-R, DVD+R, DVD-RW, and Dual-Layer DVD Capacities

The letters in a DVD format describe how the disc records data and whether it can be rewritten. They do not change the basic 4.7 GB capacity of a standard 120 mm single-layer disc.

DVD-R and DVD+R are write-once formats, including their dual-layer versions. DVD-RW and DVD+RW are the rewritable families. Dual-layer media gains capacity by adding a second recording layer on the same side.

What About Mini DVDs?

An 80 mm mini DVD has less recording area than a standard 120 mm disc. A single-layer 80 mm DVD-R holds about 1.46 GB per side, while dual-layer 80 mm DVD-R DL and DVD+R DL media hold about 2.66 GB per side.

What Happens to DVD Size When You Copy or Convert It?

A 4.7 GB or 8.5 GB label describes the disc's maximum storage capacity, not the size of every digital copy made from it. Hard-drive space depends on how much data is recorded on the DVD, which titles and tracks you keep, and whether the video is copied, remuxed, or re-encoded.

Full-Disc Copy or ISO

A full-disc copy keeps more of the original DVD structure than extracting only the main title. DVDneXtCOPY DVD Copy can save a DVD as an ISO image or DVD folder and provides Full Disc and Main Movie modes. A nominal 8.5 GB disc does not have to contain 8.5 GB of recorded data, so the finished copy can be smaller than the capacity printed on the disc.

MKV or Passthrough

Moving selected video, audio, and subtitle streams into another container without re-encoding the video does not create the same size reduction as compression. The new file can be smaller if menus, extras, or unwanted tracks are omitted, but the retained encoded streams remain largely unchanged.

MP4 or Re-encoded Video

Re-encoding can reduce the size of a DVD movie, but there is no fixed conversion ratio between an 8.5 GB DVD and the resulting MP4 or MKV. Runtime, video codec, bitrate, resolution, audio settings, and the titles or tracks you keep all affect the result.

DVDneXtCOPY DVD Ripper accepts a physical DVD, DVD folder, or ISO and lets you select titles, chapter ranges, audio tracks, subtitles, and output profiles such as MP4 and MKV. Advanced settings provide codec and other output controls, so you can choose a smaller encoded file when storage space matters more than keeping the existing video stream unchanged.

How Many Hours of Video Fit on a DVD?

There is no fixed hour rating for DVD-5, DVD-9, or DVD-18. A disc stores bytes, while video duration depends on the bitrate used for video and audio. Higher bitrates consume the available capacity faster, while lower bitrates fit more runtime into the same disc space.

For authored DVD-Video, runtime is therefore a result of encoding and authoring choices rather than another physical property of the DVD.

Conclusion

DVD capacity answers three different storage questions: use nominal GB when choosing a disc, GiB when comparing what software reports, and the actual copied or encoded file size when planning hard-drive space. Keeping those measurements separate makes it easier to choose the right media and estimate space for a digital copy.