Your Guide to Record Sizes

12 Inch Records - House albums - Plays at 33 1/3 rpm - Late introduction, post-radio era

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10 Inch Records - Rare record size - Short run time - Attention span advantage - 78 RPM industry standard

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7 Inch Records - Smallest common size - Played at 45 rpm - Holds single song

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What is the difference between 33 45 and 78 records? The central difference lies in the speed at which they are supposed to be played.

What size is a 45 record? A record that requires being played at 45 rpm in order to sound as intended will be on 7 inch record sizes.

What is the size of a 33 record? A record that requires being played at 33 1/3 rpm in order to sound as intended will be on 12 inch record sizes.