[[quoteright:320:[[Manga/DokiDokiSchoolHours http://static.tvtropes.org/pmwiki/pub/images/doki_doki_measuring_day.jpg]]]]
[[caption-width-right:320:Relax, she's just playing sudoku and messing with your head.]]

A Japanese cultural trope often seen in manga and anime series that take place in a school setting, measuring day is the students' annual full physical examination. This usually takes place during the course of a whole day and is often used for fanservice. Since MostWritersAreMale expect lots of [[GagBoobs jokes in which certain physical quantities]] of (female) students get compared--or where one of the girls gets a chance to really freak out about her weight problem, imagined or not. Conversely, a lack of growth, embarrassing or inappropriate underwear, or an inappropriate body ''under'' the underwear are also sources for potential angst, making measuring day a special trial for a WholesomeCrossdresser or a SweetPollyOliver. In addition, there's the usual [[AllMenArePerverts group of guys]] that always try to [[ThePeepingTom peek]] on the girl's examinations.

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!!Examples:

* ''DokiDokiSchoolHours''
* ''Manga/AzumangaDaioh''. Surprisingly, Kimura-sensei is almost entirely absent from those scenes, despite being an [[DirtyOldMan obvious avenue for cheap humor]]. (He shows up for a single punchline.)
* ''{{Maburaho}}''
* ''HighSchoolGirls''
* Briefly in ''MahouSenseiNegima''
* ''OuranHighSchoolHostClub'', complete with a mad scramble to conceal the (female) protagonist's actual gender that culminates in the Ohtori family ordering a doctor "in the next room" to keep her secret.
** The FanService part gets lampshaded since (barring Haruhi) all the students have their own personal doctors and the examination is "really popular" because of MrFanservice.
* The ''KatamariDamacy'' series sometimes has scenes like this in its outdoor levels.
* ''PrettyFace'' has one of these with the protagonist trying wacky schemes to get out of the physical examination, which would reveal that he's not actually a girl. Turns out the doctor giving the examinations [[spoiler:is the same one that gave him a girl's face in the first place]].
* ''DaCapo Second Season''
* ''SchoolRumble''. Both Tenma and Harima sneak in as personnel, and HilarityEnsues.
** And the actual measuring [[ShaggyDogStory had been cancelled]].
* Seen as a short intro segment in ''SayonaraZetsubouSensei'' with Maria messing with the other girls' weightings.
* The Korean horror movie, ''{{Memento Mori}}'' has a scene with this.
* ''LuckyStar''. Only one of the girls has nothing to be gloomy about, and gets flat-out scolded for it. (Though the others' complaints are hardly earth-shattering stuff: "[[OlderThanTheyLook I'm still short]]," "[[GoofyPrintUnderwear I forgot it's measuring day today and wore my printed pants]]" and "[[WeightWoe I gained one pound.]]")
* ''RosarioToVampire'' in the anime's ''Capu2''. Mizore doesn't actually ''get'' measured because she's too busy [[StalkerWithACrush stalking]] Tsukune again.
** Happens in Season II of the manga as well... during a FreakyFridayFlip with ''[[CuteWitch Yukari Sendo]] and [[SummonMagic Fang-Fang Huang]]''. It's explained in the manga version that measurement day is meant to show how well the students have settled into their human forms. Witch and a Yasha? They might both be magic, but that would all go to hell if they got caught in the wrong body.
* ''HellTeacherNube'', where the doctor is actually Nube's [[TheRival rival]] ([[DefeatMeansFriendship and enemy at the time]]) [[{{Obake}} Tamamo]]. When he tries to confront him mid-examination, the girls toss ''Nube'' out and call him a pervert.
* ''MariaHolic'', where a main character has to resort to subterfuge to keep his crossdressing secret.
* ''Manga/HidamariSketch'' has an entire chapter on this. If Yuno, who [[OlderThanTheyLook cared more about her height]] than weight, decided not to have breakfast, then [[HollywoodPudgy Hiro]]... Also, is a 2mm difference in height merely due to error?
* ''CromartieHighSchool'' has a ''hilarious'' skit involving a visiting doctor and his reactions when measuring the less... ''ordinary'' students of Cromartie.
* Variant crops up in ''Manga/ACertainScientificRailgun''. It's called "Measuring Day" but rather than a physical exam it's measuring the students' special powers. Special precautions have to be taken at Tokiwadai when measuring [[PersonOfMassDestruction Mikoto's]] Railgun, including using the pool as a shock absorber.
* Measuring day presents a real problem for Makoto in ''BokuNoFutatsuNoTsubasa'': Namely, concealing the fact that she's a true Hermaphrodite from her peers.
* ''SeikonNoQwaser'' has this for a filler episode, with the expected focus on breast measurement.
* Used as a conflict point in StrawberryEggs in which crossdressing teacher Hibiki is at a loss on how to prevent his status as male from being known after the faculty declares he must undergo a physical as well. His landlady saves the day.
* ''MayoChiki''
* ''Manga/{{Guyver}}'', in the 2005 anime. Gives Sho an OhCrap moment, because at this point, he had no idea what the Guyver was, only that it had implanted '''something''' in his back the first time he wore it.
* Occurs in both ''VideoGame/{{Persona 4}}'' and ''VideoGame/DevilSurvivor2'' by Creator/{{Atlus}}. In both, the characters have been getting into dangerous situations and one of the characters suggests a full physical examination to check for side effects, and in both the girls compare their cup sizes, declaring a "winner". In ''Devil Survivor'', there's an option to peep if you choose to skip your own exam.
* ''Manga/{{Sekirei}}'' features a omake built on this concept, Examination Day. All Sekirei in the city are required to report for physical exams, which involves bikinis and competition over bust size. The [[ACupAngst flat-chested]] villain ends up leveling the building after [[BuxomIsBetter the heroes]] discover her dropped bra and wonder who such a tiny thing could belong to.
* ''Manga/{{Beelzebub}}'' had this when the Ishiyama High kids were at St. Ishiyama Academy. The main fanservice came from the guys, with the protagonist and his best friend as the only boys in the room (accidentally, they were searching for a baby that was lost in there) when the girls do their examination, which was actually quite matter-of-fact.
* ''Webcomic/{{Karin-dou 4koma}}'': While the other girls compare bust sizes, [[CuteGhostGirl Ran]] briefly becomes a skeleton with glowing eyes to terrify some boys trying to peek.
* In one episode of ''InfiniteStratos'', due to the frequent attacks on the IS Academy, the Academy decides they need to increase the number of prepared defenders, so they have all the students get measured so they can get them into [[PoweredArmor IS Suits]] of their own. IS Academy happens an all-girls school...except for TheOneGuy, Ichika. And, of course, it's he who gets roped into measuring the girls. Fearing [[PervertRevengeMode retribution]] from his UnwantedHarem, he tries to do the measurements with his eyes closed. Unfortunately, he accidentally gropes the girl he's measuring, whose squeals attracts his harem anyway...cue OhCrap from Ichika.
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