Portsmouth Formulas

Portsmouth Yardstick Table V RELATIONSHIP OF DPN TO PHRF
The US SAILING Portsmouth Committee has determined that generally: A DIFFERENCE OF 1 DPN = A DIFFERENCE OF 6 SECONDS PHRF
Therefore:
D-PN		PHRF	D-PN		PHRF	D-PN		PHRF
54.5	=	– 3	73.0	=	108	91.5	=	219
55.0	=	0	73.5	=	111	92.0	=	222
55.5	=	3	74.0	=	114	92.5	=	225
56.0	=	6	74.5	=	117	93.0	=	228
56.5	=	9	75.0	=	120	93.5	=	231
57.0	=	12	75.5	=	123	94.0	=	234
57.5	=	15	76.0	=	126	94.5	=	237
58.0	=	18	76.5	=	129	95.0	=	240
58.5	=	21	77.0	=	132	95.5	=	243
59.0	=	24	77.5	=	135	96.0	=	246
59.5	=	27	78.0	=	138	96.5	=	249
60.0	=	30	78.5	=	141	97.0	=	252
60.5	=	33	79.0	=	144	97.5	=	255
61.0	=	36	79.5	=	147	98.0	=	258
61.5	=	39	80.0	=	150	98.5	=	261
62.0	=	42	80.5	=	153	99.0	=	264
62.5	=	45	81.0	=	156	99.5	=	267
63.0	=	48	81.5	=	159	100.0	=	270
63.5	=	51	82.0	=	162	100.5	=	273
64.0	=	54	82.5	=	165	101.0	=	276
64.5	=	57	83.0	=	168	101.5	=	279
65.0	=	60	83.5	=	171	102.0	=	282
65.5	=	63	84.0	=	174	102.5	=	285
66.0	=	66	84.5	=	177	103.0	=	288
66.5	=	69	85.0	=	180	103.5	=	291
67.0	=	72	85.5	=	183	104.0	=	294
67.5	=	75	86.0	=	186	104.5	=	297
68.0	=	78	86.5	=	189	105.0	=	300
68.5	=	81	87.0	=	192	105.5	=	303
69.0	=	84	87.5	=	195	106.0	=	306
69.5	=	87	88.0	=	198	106.5	=	309
70.0	=	90	88.5	=	201	107.0	=	312
70.5	=	93	89.0	=	204	107.5	=	315
71.0	=	96	89.5	=	207	108.0	=	318
71.5	=	99	90.0	=	210	108.5	=	321
72.0	=	102	90.5	=	213	109.0	=	324
72.5	=	105	91.0	=	216	etc.		etc.