The NDL in Numbers
| Number of permanent positions | 890 (including Librarian and Deputy Librarian) As of April 2011 |
| 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 |
| Stack room temperature | 22 degrees C |
| Stack room humidity | 55% |
| Stacked volumes(FY 2010) | |
| Books | 9,698,593 volumes |
| Japanese, Chinese, Korean | 7,092,109 volumes |
| Western | 2,606,484 volumes |
| Serial publications | 14,272,111 items |
| Periodicals | 9,669,653 items |
| Japanese | 6,298,595 items |
| Overseas | 3,371,058 items |
| Newspapers | 4,602,458 items |
| Japanese | 3,104,527 items |
| Overseas | 1,497,931 items |
| Microforms | 8,841,588 items |
| Sound recordings | 660,304 items |
| Maps | 539,488 items |
| Doctoral dissertations | 540,459 titles |
| Documents | 324,786 items |
| Days open (FY 2010) | |
| Tokyo Main Library | 279 days |
| Kansai-kan | 280 days |
| ILCL | 286 days |
| Number of visitors (FY 2010) | |
| Tokyo Main Library | 470,833 |
| Kansai-kan | 59,445 |
| ILCL | 116,899 |
| Circulation (FY 2010) | |
| Tokyo Main Library | 1,511,341 items/year |
| Kansai-kan | 88,747 items/year |
| ILCL | 11,833 items/year |
| Photoduplication (FY 2010) | |
| Tokyo Main Library | 863,974 cases/year |
| Kansai-kan | 191,806 cases/year |
| ILCL | 5,207 cases/year |
| Reference services (FY 2010) | |
| Tokyo Main Library | 478,544 cases/year |
| Kansai-kan | 49,269 cases/year |
| ILCL | 14,475 cases/year |
| Research for the Diet (FY 2010) | 38,236 cases/year |
*1 ILCL = International Library of Children's Literature