mm	decimal		mm	decimal		mm	decimal		mm	decimal		mm	decimal		mm	decimal
	1	0.0394		51	2.0079		101	3.9764		151	5.9449		201	7.9134		251	9.8819
	2	0.0787		52	2.0472		102	4.0157		152	5.9843		202	7.9528		252	9.9213
	3	0.1181		53	2.0866		103	4.0551		153	6.0236		203	7.9921		253	9.9606
	4	0.1575		54	2.1260		104	4.0945		154	6.0630		204	8.0315		254	10.0000
	5	0.1969		55	2.1654		105	4.1339		155	6.1024		205	8.0709		255	10.0394
	6	0.2362		56	2.2047		106	4.1732		156	6.1417		206	8.1102		256	10.0787
	7	0.2756		57	2.2441		107	4.2126		157	6.1811		207	8.1496		257	10.1181
	8	0.3150		58	2.2835		108	4.2520		158	6.2205		208	8.1890		258	10.1575
	9	0.3543		59	2.3228		109	4.2913		159	6.2598		209	8.2283		259	10.1969
	10	0.3937		60	2.3622		110	4.3307		160	6.2992		210	8.2677		260	10.2362
	11	0.4331		61	2.4016		111	4.3701		161	6.3386		211	8.3071		261	10.2756
	12	0.4724		62	2.4409		112	4.4094		162	6.3780		212	8.3465		262	10.3150
	13	0.5118		63	2.4803		113	4.4488		163	6.4173		213	8.3858		263	10.3543
	14	0.5512		64	2.5197		114	4.4882		164	6.4567		214	8.4252		264	10.3937
	15	0.5906		65	2.5591		115	4.5276		165	6.4961		215	8.4646		265	10.4331
	16	0.6299		66	2.5984		116	4.5669		166	6.5354		216	8.5039		266	10.4724
	17	0.6693		67	2.6378		117	4.6063		167	6.5748		217	8.5433		267	10.5118
	18	0.7087		68	2.6772		118	4.6457		168	6.6142		218	8.5827		268	10.5512
	19	0.7480		69	2.7165		119	4.6850		169	6.6535		219	8.6220		269	10.5906
	20	0.7874		70	2.7559		120	4.7244		170	6.6929		220	8.6614		270	10.6299
	21	0.8268		71	2.7953		121	4.7638		171	6.7323		221	8.7008		271	10.6693
	22	0.8661		72	2.8346		122	4.8031		172	6.7717		222	8.7402		272	10.7087
	23	0.9055		73	2.8740		123	4.8425		173	6.8110		223	8.7795		273	10.7480
	24	0.9449		74	2.9134		124	4.8819		174	6.8504		224	8.8189		274	10.7874
	25	0.9843		75	2.9528		125	4.9213		175	6.8898		225	8.8583		275	10.8268
	26	1.0236		76	2.9921		126	4.9606		176	6.9291		226	8.8976		276	10.8661
	27	1.0630		77	3.0315		127	5.0000		177	6.9685		227	8.9370		277	10.9055
	28	1.1024		78	3.0709		128	5.0394		178	7.0079		228	8.9764		278	10.9449
	29	1.1417		79	3.1102		129	5.0787		179	7.0472		229	9.0157		279	10.9843
	30	1.1811		80	3.1496		130	5.1181		180	7.0866		230	9.0551		280	11.0236
	31	1.2205		81	3.1890		131	5.1575		181	7.1260		231	9.0945		281	11.0630
	32	1.2598		82	3.2283		132	5.1969		182	7.1654		232	9.1339		282	11.1024
	33	1.2992		83	3.2677		133	5.2362		183	7.2047		233	9.1732		283	11.1417
	34	1.3386		84	3.3071		134	5.2756		184	7.2441		234	9.2126		284	11.1811
	35	1.3780		85	3.3465		135	5.3150		185	7.2835		235	9.2520		285	11.2205
	36	1.4173		86	3.3858		136	5.3543		186	7.3228		236	9.2913		286	11.2598
	37	1.4567		87	3.4252		137	5.3937		187	7.3622		237	9.3307		287	11.2992
	38	1.4961		88	3.4646		138	5.4331		188	7.4016		238	9.3701		288	11.3386
	39	1.5354		89	3.5039		139	5.4724		189	7.4409		239	9.4094		289	11.3780
	40	1.5748		90	3.5433		140	5.5118		190	7.4803		240	9.4488		290	11.4173
	41	1.6142		91	3.5827		141	5.5512		191	7.5197		241	9.4882		291	11.4567
	42	1.6535		92	3.6220		142	5.5906		192	7.5591		242	9.5276		292	11.4961
	43	1.6929		93	3.6614		143	5.6299		193	7.5984		243	9.5669		293	11.5354
	44	1.7323		94	3.7008		144	5.6693		194	7.6378		244	9.6063		294	11.5748
	45	1.7717		95	3.7402		145	5.7087		195	7.6772		245	9.6457		295	11.6142
	46	1.8110		96	3.7795		146	5.7480		196	7.7165		246	9.6850		296	11.6535
	47	1.8504		97	3.8189		147	5.7874		197	7.7559		247	9.7244		297	11.6929
	48	1.8898		98	3.8583		148	5.8268		198	7.7953		248	9.7638		298	11.7323
	49	1.9291		99	3.8976		149	5.8661		199	7.8346		249	9.8031		299	11.7717
	50	1.9685		100	3.9370		150	5.9055		200	7.8740		250	9.8425		300	11.8110

This chart may be printed out.   factor 1/25.4 -- 4 places (1 inch = 25.4 mm exactly)