About this data
How every figure on this site gets here
Every number on this site is transcribed from a ward's own published document. Nothing is estimated, predicted, or generated. This page explains exactly how it gets here, how it is checked, and where it can still be wrong.
Where the figures come from
| What | Ward's own source |
|---|---|
| Edogawa capacity & openings | 認可私立保育施設・区立保育園の定員と募集数 |
| Edogawa admission index | 利用調整の基本 |
| Koto capacity & openings | 空き人員一覧 |
| Koto admission cut-offs | 申込倍率・保育園入所指数ボーダー表 |
| Child benefits | Each ward's 児童手当 and 医療費助成 pages, linked on the benefits pages |
How they are extracted
The wards publish these as PDFs whose layout defeats ordinary text extraction — columns collide and rows merge, so copying the text out produces plausible-looking nonsense. Figures are read by coordinate instead: every token's position on the page is used to assign it to a row and a column band, rather than trusting reading order.
How they are checked
Each ward sheet carries its own totals. Every parsed row is reconciled against the ward's printed total for that facility, and each sheet against its 合計 row. A parse that does not reconcile is not published. It fails loudly rather than shipping a number that looks right.
Addresses
Addresses are joined to facilities by exact normalised name only. For Edogawa, 155 of 194 matched that way; the remaining 39 were transcribed by hand from the ward's own facility pages.
Fuzzy matching was tried and abandoned. It produced 13 wrong addresses — including matching 平井保育園 to クオリスキッズ平井 with high confidence. In this domain a near-match sends a parent to the wrong building, so approximate matching is not used at all.
The admission index
Each ward's index table is transcribed by hand, once a year. Edogawa's calculator reproduces all three of the worked examples the ward publishes; Koto's table is image-only and is transcribed the same way.
It covers work-based scoring, which is most households. Illness, caregiving, study and job-hunting sit on the wards' fuller tables and are not scored here. It estimates how the ward would score you. It is not a decision and not a prediction of a place.
Distances
Your postcode and each nursery are placed at the centre of their 町丁目, so a distance is good to roughly half a kilometre. Use it to shortlist, not to choose between two nurseries on neighbouring streets. The exact address is on each nursery's own panel.
How often this changes
- Nursery figures — each ward republishes monthly. Every page states the date of the figures it carries.
- Benefits — checked automatically every week against the wards' own pages. If a figure we publish stops appearing on theirs, the page says so instead of showing a confirmation date.
What this site does not do
It does not republish the wards' pages or documents. Figures are reproduced as factual data with the source credited and linked on every page. Not affiliated with, endorsed by, or operated by any ward office or the Tokyo Metropolitan Government.
Where it can still be wrong
- A ward publishes a correction that has not been picked up yet.
- A facility opens, closes or changes capacity between publications.
- A nursery showing no openings may still accept applications — Edogawa states places come free after publication.
- Cut-off scores are last year's, and move with how many families apply.
Always confirm against the ward's official page before you apply.