The Wartime Naval Armaments Supplement Programme (マル戦計画, 昭和十八年度戦時艦艇建造計画 Maru Sen Keikaku, Shōwa-Jūhachi-Nendo Senji Kantei-Kenzō Keikaku) was the final armaments expansion plan of the Imperial Japanese Navy (IJN).
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Early 1944, the IJN started building warships for war. The plan did not include any large warships which were suitable for offensive operations.
| Category | Class | Vessel number(s) | Completed | Converted | Cancelled |
| Military transporter 2nd class | No.101 | #1501–1569 and 32 vessels | No.101 and 68 vessels | 22 vessels were transferred to the Army. | 32 vessels |
| Coast defence boat Type-A (wooden) | No.101 | #1701–1760 | |||
| Minelayer | Kamishima | #1801–1809 | Kamishima (#1801), Awashima (#1802) | #1803–1809 | |
| Minoo | #1821–1822 | Minoo (#1821) | #1822 | ||
| Coast defence boat Type-B (steel) | No.1 | #1851–1870 | |||
| Auxiliary subchaser | Aux. No.1 | #2001–2100 | Aux. No.151 (#2001) to Aux. No.250 (#2100) | ||
| Auxiliary patrol boat | Aux. No.1 | #2121–2400 | Aux. No.1 (#2121) and 26 vessels | #2125–2144, 2148–2150, 2155–2156, 2159–2173, 2176–2183, 2187–2203, 2207–2209, 2214–2229, 2232–2241, 2244–2252, 2261–2271, 2277–2282, 2287–2292, 2302–2310 and 2314–2400 | |
| Escort ship Type-C | No.1 | 2401–2532 and 168 vessels | No.1 (#2401) and 55 vessels | #2446–2447, 2450–2452, 2455–2502, 2505–2506, 2515–2532 and 168 vessels | |
| Escort ship Type-D | No.2 | #2701–2843 and 57 vessels | No.2 (#2701) and 66 vessels | #2735, 2740, 2743–2750, 2754–2755, 2757, 2760–2761, 2764, 2768, 2770, 2773–2774, 2776, 2781–2792, 2794, 2803–2843 and 57 vessels | |
| Military transporter 1st class | No.1 | #2901–2922 and 12 vessels | No.1 (#2901) and 20 vessels | 12 vessels | |
| Submarine Type-D | I-361 | #2961 | I-372 (#2961) | ||
| I-373 | #2962–2967 | I-373 (#2962) | #2963–2967 | ||
| S60 | #2968–2971 | #2968–2971 | |||
| Submarine Type-E | S54-2 | #2981–3024 and 48 boats | #2981–3024 and 48 boats | ||
| Patrol torpedo boat | PT-151, PT-201, PT-220, PT-235, PT-241, PT-301, PT-327, PT-411, PT-468, PT-469, PT-474, PT-491, PT-538, H-2, H-10, H-27, H-74 and H-101 | 1540 vessels | approx. 860 vessels | unknown | |
| High-speed submarine (large) | I-201 | #4501–4506 | I-201 (#4501), I-202 (#4502), I-203 (#4503) | ||
| S56B | #4507–4523 | #4509–4523 | |||
| Transport submarine (small) | Ha-101 | #4601–4612 | Ha-101 (#4601), Ha-102 (#4602), Ha-103 (#4603), Ha-104 (#4604), Ha-105 (#4605), Ha-106 (#4606), Ha-107 (#4607), Ha-108 (#4608), Ha-109 (#4609), Ha-111 (#4611) | ||
| Escort ship Type-B | Ukuru | #4701–4721 | Inagi (#4701), Habushi (#4702), Ojika (#4703), Kanawa (#4704), Uku (#4705), Takane (#4707), Kuga (#4709), Shiga (#4711), Iō (#4712) | #4706, 4708, 4710 and 4713–4721 | |
| Destroyer Type-D | Matsu | #4801 - 4832 | Nire (#4809), Nashi (#4810), Sii (#4811), Enoki (#4812), Odake (#4814), Hatsuume (#4815) | #4801–4808, 4813 and 4816–4832 | |
| Fleet oiler | Hario | #4901–4904 | Hario (#4901) | #4902–4904 | |
| High-speed submarine (small) | Ha-201 | #4911–4989 | Ha-201 (#4911), Ha-202 (#4912), Ha-203 (#4913), Ha-204 (#4914), Ha-205 (#4915), Ha-207 (#4917), Ha-208 (#4918), Ha-209 (#4919), Ha-210 (#4920), Ha-216 (#4926) |