The NDL in Numbers
| Number of permanent positions | 890 (including Librarian and Deputy Librarian) As of April 2012 |
| Total floor area | |
| Tokyo Main Library | 148,000 square meters |
| Kansai-kan | 59,300 square meters |
| ILCL *1 | 6,700 square meters |
| Stack capacity | |
| Tokyo Main Library | 12 million volumes |
| Kansai-kan | 6 million volumes |
| ILCL | 0.4 million volumes |
| Stacked volumes | |
| Books | 9,887,050 items |
| Japanese, Chinese, Korean | 7,246,054 items |
| Western | 2,640,996 items |
| Serial publications | 14,846,587 items |
| Periodicals | 10,033,729 items |
| Japanese | 6,560,734 items |
| Overseas | 3,472,995 items |
| Newspapers | 4,812,858 items |
| Japanese | 3,236,095 items |
| Overseas | 1,576,763 items |
| Microforms | 8,934,480 items |
| Sound recordings | 669,030 items |
| Maps | 541,404 items |
| Doctoral dissertations | 554,697 items |
| Documents | 338,525 items |
| Days open (FY 2011) | |
| Tokyo Main Library | 280 days |
| Kansai-kan | 280 days |
| ILCL | 286 days |
| Number of visitors (FY 2011) | 624,282 |
| Tokyo Main Library | 461,880 |
| Kansai-kan | 60,580 |
| ILCL | 101,822 |
| Circulation (FY 2011) | 2,272,065 items/year |
| Tokyo Main Library | 2,124,754 items/year |
| Kansai-kan | 117,143 items/year |
| ILCL | 30,168 items/year |
| Photoduplication (FY 2011) | 1,155,468 cases/year |
| Tokyo Main Library | 959,319 cases/year |
| Kansai-kan | 190,093 cases/year |
| ILCL | 6,056 cases/year |
| Reference services (FY 2011) | 651,109 cases/year |
| Tokyo Main Library | 589,347 cases/year |
| Kansai-kan | 50,341 cases/year |
| ILCL | 11,421 cases/year |
| Research for the Diet (FY 2011) | 42,484 cases/year |
*1 ILCL = International Library of Children's Literature