Tape Notes · Tape lengths
C-46, C-60 or C-90? How much music fits on a cassette
11 October 2026 · 5 min read
The number on a blank cassette is its total playing time in minutes, both sides together. A C-60 gives you 30 minutes a side, a C-90 gives you 45, and a C-46 gives you 23. For most mixtapes a C-60 or a C-90 is the right choice: long enough for a proper running order, and the tape is still thick enough to last. Here's how much music fits on each length, and how to plan your sides so nothing gets cut off.
How much music fits on each tape
| Tape | Per side | Total | Songs a side* | Tape thickness | Good for |
|---|---|---|---|---|---|
| C-46 | 23 min | 46 min | about 6 | about 16–18 µm | One album, an EP or a demo |
| C-60 | 30 min | 60 min | about 8 | about 16–18 µm | The classic mixtape |
| C-90 | 45 min | 90 min | about 12 | about 11–12 µm | A long mix, a road trip, two albums back to back |
| C-120 | 60 min | 120 min | about 16 | under 10 µm | Talk, radio shows, background music |
*At three and a half to four minutes a song. Dance mixes and prog epics will fit fewer.
Why each side gets half
A cassette has two stereo tracks side by side on the same tape, one for each direction. Side A plays one way; when you turn the tape over, Side B plays the other half of the tape's width in the opposite direction. So a C-60 holds 30 minutes of tape length, used twice.
The tape runs past the head at 4.76 cm a second (1⅞ inches). That makes a C-60 about 86 metres of tape (makers quote around 90 m with the leader), a C-90 about 130 m and a C-120 about 170 m, all wound into the same size of shell.
Why longer tapes are more fragile
To fit more tape into the same shell, the tape has to be thinner. C-46 and C-60 tapes are about 16–18 micrometres thick, a C-90 is about 11–12 µm and a C-120 is thinner still. Thin tape stretches and snaps more easily, and it's more likely to get chewed by a tired player or an auto-reverse mechanism (our guide to looking after cassettes shows how to rescue one).
- C-60: the toughest of the common lengths. Best for a tape that will be played a lot, or posted to someone.
- C-90: fine in a decent deck or personal stereo, and the most music for the money.
- C-120: avoid it for anything you want to keep, or for a tape going into an old car stereo.
Other lengths you'll see
C-46, C-60 and C-90 are the usual three, but plenty of others were made: short C-10, C-12 and C-15 tapes for home computers and demos, and C-54, C-64, C-74, C-80, C-100 and C-110 among the longer ones. Duplicators who make tapes for bands load them to order, so a release can come on a tape that's just long enough for the album, such as a C-38. Many blank tapes also give you a little extra time at the end of each side, but it varies from brand to brand, so don't plan on it.
How to plan your sides
- Add up each side. Write the running times down and total them as you go. Each side has to fit inside the per-side time, not the total.
- Leave a minute spare. The first few seconds of every tape are clear leader that can't record, and the gaps between songs add up.
- Balance the sides. If Side A is 29 minutes and Side B is 18, whoever plays it sits through 11 minutes of hiss. Move a song across or add a short one.
- Don't let the last song get cut off. If it won't fit, swap it for a shorter one or end the side on a fade.
- Pick the next size up if you need to. An album with a 25-minute side won't fit a C-46. Use a C-60 and leave the end blank.
Quick rule: 7–8 songs a side on a C-60, 11–12 on a C-90. Count your songs before you buy the tapes.
Which should you buy?
- An album or EP for a band release: a C-46, or a tape loaded to the album's length (see our guide for bands and labels).
- A mixtape for someone: a C-60. It's the classic, and it holds up well.
- A long drive or a party: a C-90.
- Audiobooks, radio shows, recordings of talks: a C-90, or a C-120 if you really need the hour a side.
The tape type matters too: normal (Type I) tape plays properly on every machine. Our guide to tape types explains chrome and metal, and how to make a mixtape covers recording it.
Put the length on the J-card
On jcard.studio, the Words step has C-46, C-60 and C-90 buttons. The length goes on the spine, the cover line and the inside panel, the way blank tapes printed it. Speed Stripes is built around it, with the minutes in big type on the cover.
Making a tape? Design a J-card that fits the case.
Try Speed Stripes →Sources
More Tape Notes
- How to look after cassettes: storage, cleaning and fixing a chewed tape
- J-card design through the decades: from blank-tape stripes to rave tape packs
- Dolby noise reduction on cassettes: B, C and S explained
- Reading a blank tape's J-card: MOL, SOL, bias, EQ and “high position”
- How to make a mixtape: choosing, timing and recording a cassette
- Printing J-cards at home: paper, settings, cutting and folding
- Cassettes for bands and labels: a short-run release guide
- How to make a cassette J-card: sizes, printing and folding
- Cassette tape types explained: Type I, II, III and IV
- A short history of the cassette tape