Giving you the Edge in Business

The International 1/4" Rule is a pure formula rule.
The International Rule has a maximum scaling length of 20 feet.
Each segment is broken into 4' bolts and an allowance for taper of 1" per 8' is applied.

The formula is as follows:
First 4' Segment
((0.22 * D²) - ( 0.71 * D )) * 0.905

Second 4' Segment
((0.22 * (D + 0.5)²) - ( 0.71 * (D + 0.5) )) * 0.905

Third 4' Segment
((0.22 * (D + 1.0)²) - ( 0.71 * (D + 1.0) )) * 0.905

Fourth 4' Segment
((0.22 * (D + 1.5)²) - ( 0.71 * (D + 1.5) )) * 0.905

Fifth 4' Segment
((0.22 * (D + 2.0)²) - ( 0.71 * (D + 2.0) )) * 0.905

The segment values are then added up.
So, for a 12' Log the total BF would be:
1) ((0.22 * D²) - ( 0.71 * D )) * 0.905
2) Plus: ((0.22 * (D + 0.5)²) - ( 0.71 * (D + 0.5) )) * 0.905
3) Plus: ((0.22 * (D + 1.0)²) - ( 0.71 * (D + 1.0) )) * 0.905

Note 1:
For partial segments, the volume is proportioned by the length of the bolt.
For example, a 10' log would involve the same calculation as above, except that the third segment would be multiplied by 50%.
3b) Plus: ((L - 8) / 4) * ((0.22 * (D + 1.0)²) - ( 0.71 * (D + 1.0) )) * 0.905

Note 2:
The 0.905 term is used for the 1/4" rule. For the 1/8" rule, the 0.905 term would be omitted (or set to 1.0)

The following Table shows the International 1/4" Rule volumes, rounded to a single board foot (1 BF)

Len/Diam	4"	5"	6"	7"	8"	9"	10"	11"	12"	13"	14"	15"	16"	17"	18"	19"
4'	1	2	3	5	8	10	13	17	21	25	30	35	41	47	53	60
5'	1	2	4	7	10	13	17	22	27	32	38	45	52	59	67	75
6'	1	3	5	8	12	16	21	26	32	39	46	54	62	71	81	91
7'	1	4	6	10	14	19	25	31	38	46	54	64	73	84	95	107
8'	2	4	8	12	17	22	29	36	44	53	63	73	84	96	109	123
9'	2	5	9	14	19	26	33	41	50	60	71	83	96	110	124	140
10'	3	6	10	15	22	29	37	46	57	68	80	93	108	123	139	156
11'	3	7	11	17	24	32	41	52	63	75	89	104	119	136	154	173
12'	4	8	13	19	27	36	46	57	69	83	98	114	131	149	169	190
13'	4	9	14	21	30	39	50	63	76	91	107	125	143	163	185	207
14'	5	10	16	24	33	43	55	68	83	99	117	136	156	177	200	225
15'	5	11	18	26	36	47	60	74	90	107	126	146	168	191	216	243
16'	6	12	19	28	39	51	65	80	97	115	136	157	181	206	232	260
17'	7	13	21	31	42	55	70	86	104	124	146	169	194	220	249	279
18'	8	14	23	33	45	59	75	93	112	133	156	181	207	235	265	297
19'	8	16	25	36	49	64	80	99	119	142	166	192	220	250	282	316
20'	9	17	27	39	52	68	86	105	127	151	176	204	234	265	299	334

Len/Diam	20"	21"	22"	23"	24"	25"	26"	27"	28"	29"	30"	31"	32"	33"	34"	35"
4'	67	74	82	91	99	108	118	128	138	149	160	171	183	196	208	221
5'	84	94	104	114	125	137	149	161	174	187	201	216	231	246	262	278
6'	102	113	125	138	151	165	179	194	210	226	243	260	278	297	316	335
7'	120	133	147	162	177	193	210	227	246	265	284	304	325	347	369	392
8'	137	153	169	185	203	221	241	261	282	303	326	349	373	398	423	450
9'	156	173	191	210	230	251	273	295	319	343	368	395	422	450	478	508
10'	174	194	214	235	257	280	305	330	356	383	411	440	471	502	534	567
11'	193	214	236	260	284	310	337	364	393	423	454	486	519	554	589	626
12'	212	235	259	285	311	339	368	399	430	463	497	532	568	606	645	684
13'	231	256	283	311	340	370	402	435	469	504	541	579	619	660	702	745
14'	251	278	307	337	368	401	435	471	507	546	586	627	669	713	759	805
15'	270	300	330	362	396	431	468	506	546	587	630	674	720	767	816	866
16'	290	321	354	388	424	462	501	542	585	629	674	721	770	821	873	926
17'	310	344	379	416	454	494	536	579	625	672	720	770	822	876	931	988
18'	331	366	404	443	483	526	570	617	665	714	766	819	874	931	990	1051
19'	351	389	428	470	513	558	605	654	705	757	812	868	926	987	1049	1113
20'	372	412	453	497	542	590	639	691	745	800	858	917	979	1042	1108	1175

Len/Diam	36"	37"	38"	39"	40"	41"	42"	43"	44"	45"	46"	47"	48"	49"	50"	51"
4'	235	249	263	278	293	308	324	341	357	374	392	410	428	447	466	485
5'	295	313	331	349	368	387	407	428	449	470	492	514	537	561	584	609
6'	356	377	398	420	443	466	490	515	540	566	592	619	646	675	703	733
7'	416	441	466	492	518	546	573	602	631	661	692	724	756	789	822	856
8'	477	505	533	563	593	625	657	689	723	757	792	828	865	903	941	980
9'	539	570	603	636	670	706	742	779	816	855	895	935	977	1019	1062	1106
10'	601	636	672	709	748	787	827	868	910	953	997	1042	1088	1135	1183	1233
11'	663	702	742	783	825	868	912	957	1004	1051	1100	1149	1200	1252	1305	1359
12'	725	768	811	856	902	949	997	1046	1097	1149	1202	1256	1312	1368	1426	1485
13'	789	835	883	931	981	1032	1084	1138	1193	1249	1307	1365	1426	1487	1550	1614
14'	853	903	954	1006	1060	1115	1171	1229	1289	1349	1411	1475	1540	1606	1674	1743
15'	917	971	1025	1081	1139	1198	1259	1321	1384	1449	1516	1584	1654	1725	1797	1871
16'	981	1038	1096	1156	1218	1281	1346	1412	1480	1550	1621	1693	1768	1844	1921	2000
17'	1047	1108	1170	1234	1299	1366	1435	1506	1578	1652	1728	1805	1884	1965	2047	2131
18'	1113	1177	1243	1311	1380	1451	1524	1599	1676	1754	1835	1917	2000	2086	2173	2263
19'	1179	1246	1316	1388	1461	1536	1614	1693	1774	1857	1942	2028	2117	2207	2300	2394
20'	1244	1316	1389	1465	1542	1622	1703	1786	1872	1959	2049	2140	2233	2329	2426	2525

Len/Diam	52"	53"	54"	55"	56"	57"	58"	59"	60"	61"	62"	63"	64"	65"	66"	67"
4'	505	525	546	567	588	610	633	655	678	702	726	750	774	799	825	851
5'	634	659	685	711	738	766	793	822	851	880	910	940	971	1002	1034	1067
6'	762	793	824	856	888	921	954	988	1023	1058	1094	1131	1168	1205	1244	1283
7'	891	927	963	1000	1038	1076	1115	1155	1196	1237	1279	1321	1365	1409	1453	1499
8'	1020	1061	1102	1145	1188	1232	1276	1322	1368	1415	1463	1512	1561	1612	1663	1714
9'	1151	1197	1244	1292	1340	1390	1440	1491	1544	1597	1651	1705	1761	1818	1875	1934
10'	1283	1334	1386	1439	1493	1548	1604	1661	1719	1778	1838	1899	1961	2024	2088	2153
11'	1414	1470	1527	1586	1645	1706	1768	1830	1894	1959	2025	2093	2161	2230	2301	2372
12'	1545	1607	1669	1733	1798	1864	1931	2000	2070	2141	2213	2286	2361	2436	2513	2591
13'	1679	1746	1814	1883	1953	2025	2098	2172	2248	2325	2403	2483	2564	2646	2729	2814
14'	1813	1885	1958	2033	2109	2186	2265	2345	2427	2509	2594	2680	2767	2855	2945	3037
15'	1947	2024	2102	2182	2264	2347	2431	2517	2605	2694	2784	2876	2970	3065	3161	3259
16'	2081	2163	2247	2332	2419	2508	2598	2690	2783	2878	2975	3073	3173	3274	3377	3482
17'	2217	2305	2394	2485	2577	2672	2768	2865	2965	3066	3168	3273	3379	3487	3596	3708
18'	2354	2446	2541	2637	2735	2835	2937	3041	3146	3253	3362	3473	3585	3699	3816	3933
19'	2490	2588	2688	2790	2894	2999	3107	3216	3327	3441	3556	3673	3791	3912	4035	4159
20'	2627	2730	2835	2942	3052	3163	3276	3392	3509	3628	3749	3872	3998	4125	4254	4385

Len/Diam	68"	69"	70"	71"	72"	73"	74"	75"
4'	877	904	931	958	986	1014	1043	1072
5'	1099	1133	1167	1201	1236	1271	1307	1343
6'	1322	1362	1403	1444	1486	1528	1571	1615
7'	1545	1591	1639	1687	1736	1785	1836	1887
8'	1767	1821	1875	1930	1986	2042	2100	2158
9'	1993	2053	2114	2176	2239	2303	2368	2433
10'	2219	2286	2354	2423	2493	2564	2636	2709
11'	2445	2519	2593	2669	2746	2825	2904	2984
12'	2671	2751	2833	2916	3000	3085	3172	3259
13'	2900	2987	3076	3166	3257	3349	3443	3538
14'	3129	3223	3319	3416	3514	3614	3715	3817
15'	3359	3459	3562	3666	3771	3878	3986	4096
16'	3588	3696	3805	3916	4028	4142	4258	4375
17'	3820	3935	4051	4169	4289	4410	4533	4658
18'	4053	4175	4298	4423	4550	4678	4809	4941
19'	4286	4414	4544	4676	4810	4946	5084	5224
20'	4518	4654	4791	4930	5071	5214	5359	5506

The following Table shows the International 1/4" Rule volumes, rounded to a five board feet (5 BF)

Len/Diam	4"	5"	6"	7"	8"	9"	10"	11"	12"	13"	14"	15"	16"	17"	18"	19"
4'	0	0	5	5	10	10	15	15	20	25	30	35	40	45	55	60
5'	0	0	5	0	10	15	15	20	25	30	40	45	50	60	65	75
6'	0	5	5	10	10	15	20	25	30	40	45	55	60	70	80	90
7'	0	5	5	10	15	20	25	30	40	45	55	65	75	85	95	105
8'	0	5	10	10	15	20	30	35	45	55	65	75	85	95	110	125
9'	0	5	10	15	20	25	35	40	50	60	70	85	95	110	125	140
10'	5	5	10	15	20	30	35	45	55	70	80	95	110	125	140	155
11'	5	5	10	15	25	30	40	50	65	75	90	105	120	135	155	175
12'	5	10	15	20	25	35	45	55	70	85	100	115	130	150	170	190
13'	5	10	15	20	30	40	50	65	75	90	105	125	145	165	185	205
14'	5	10	15	25	35	45	55	70	85	100	115	135	155	175	200	225
15'	5	10	20	25	35	45	60	75	90	105	125	145	170	190	215	245
16'	5	10	20	30	40	50	65	80	95	115	135	155	180	205	230	260
17'	5	15	20	30	40	55	70	85	105	125	145	170	195	220	250	280
18'	10	15	25	35	45	60	75	95	110	135	155	180	205	235	265	295
19'	10	15	25	35	50	65	80	100	120	140	165	190	220	250	280	315
20'	10	15	25	40	50	70	85	105	125	150	175	205	235	265	300	335

Len/Diam	20"	21"	22"	23"	24"	25"	26"	27"	28"	29"	30"	31"	32"	33"	34"	35"
4'	65	75	80	90	100	110	120	130	140	150	160	170	185	195	210	220
5'	85	95	105	115	125	135	150	160	175	185	200	215	230	245	260	280
6'	100	115	125	140	150	165	180	195	210	225	245	260	280	295	315	335
7'	120	135	145	160	175	195	210	225	245	265	285	305	325	345	370	390
8'	135	155	170	185	205	220	240	260	280	305	325	350	375	400	425	450
9'	155	175	190	210	230	250	275	295	320	345	370	395	420	450	480	510
10'	175	195	215	235	255	280	305	330	355	385	410	440	470	500	535	565
11'	195	215	235	260	285	310	335	365	395	425	455	485	520	555	590	625
12'	210	235	260	285	310	340	370	400	430	465	495	530	570	605	645	685
13'	230	255	285	310	340	370	400	435	470	505	540	580	620	660	700	745
14'	250	280	305	335	370	400	435	470	505	545	585	625	670	715	760	805
15'	270	300	330	360	395	430	470	505	545	585	630	675	720	765	815	865
16'	290	320	355	390	425	460	500	540	585	630	675	720	770	820	875	925
17'	310	345	380	415	455	495	535	580	625	670	720	770	820	875	930	990
18'	330	365	405	445	485	525	570	615	665	715	765	820	875	930	990	1050
19'	350	390	430	470	515	560	605	655	705	755	810	870	925	985	1050	1115
20'	370	410	455	495	540	590	640	690	745	800	860	915	980	1040	1110	1175

Len/Diam	36"	37"	38"	39"	40"	41"	42"	43"	44"	45"	46"	47"	48"	49"	50"	51"
4'	235	250	265	280	295	310	325	340	355	375	390	410	430	445	465	485
5'	295	310	330	350	370	385	405	430	450	470	490	515	535	560	585	610
6'	355	380	400	420	445	465	490	515	540	565	590	620	645	675	705	735
7'	415	440	465	490	520	545	575	600	630	660	690	725	755	790	820	855
8'	475	500	535	565	595	625	655	690	725	755	790	830	865	905	940	980
9'	540	570	605	635	670	705	740	780	815	855	895	935	975	1020	1060	1105
10'	600	640	670	710	750	785	825	870	910	955	995	1040	1090	1135	1185	1235
11'	665	700	740	785	825	870	910	955	1005	1050	1100	1150	1200	1250	1305	1360
12'	725	770	810	855	900	950	995	1045	1095	1150	1200	1255	1310	1370	1425	1485
13'	790	840	885	930	980	1030	1085	1140	1195	1250	1305	1365	1425	1485	1550	1615
14'	855	900	955	1005	1060	1115	1170	1230	1290	1350	1410	1475	1540	1605	1675	1745
15'	915	970	1025	1080	1140	1200	1260	1320	1385	1450	1515	1585	1655	1725	1795	1870
16'	980	1040	1095	1155	1220	1280	1345	1410	1480	1550	1620	1695	1770	1845	1920	2000
17'	1045	1110	1170	1235	1300	1365	1435	1505	1580	1650	1730	1805	1885	1965	2045	2130
18'	1115	1180	1245	1310	1380	1450	1525	1600	1675	1755	1835	1915	2000	2085	2175	2265
19'	1180	1250	1315	1390	1460	1535	1615	1695	1775	1855	1940	2030	2115	2205	2300	2395
20'	1245	1320	1390	1465	1540	1620	1705	1785	1870	1960	2050	2140	2235	2330	2425	2525

Len/Diam	52"	53"	54"	55"	56"	57"	58"	59"	60"	61"	62"	63"	64"	65"	66"	67"
4'	505	525	545	565	590	610	635	655	680	700	725	750	775	800	825	850
5'	635	660	685	710	740	765	795	820	850	880	910	940	970	1000	1035	1065
6'	760	795	825	855	890	920	955	990	1025	1060	1095	1130	1170	1205	1245	1285
7'	890	925	965	1000	1040	1075	1115	1155	1195	1235	1280	1320	1365	1410	1455	1500
8'	1020	1060	1100	1145	1190	1230	1275	1320	1370	1415	1465	1510	1560	1610	1665	1715
9'	1150	1195	1245	1290	1340	1390	1440	1490	1545	1595	1650	1705	1760	1820	1875	1935
10'	1285	1335	1385	1440	1495	1550	1605	1660	1720	1780	1840	1900	1960	2025	2090	2155
11'	1415	1470	1525	1585	1645	1705	1770	1830	1895	1960	2025	2095	2160	2230	2300	2370
12'	1545	1605	1670	1735	1800	1865	1930	2000	2070	2140	2215	2285	2360	2435	2515	2590
13'	1680	1745	1815	1885	1955	2025	2100	2170	2250	2325	2405	2485	2565	2645	2730	2815
14'	1815	1885	1960	2035	2110	2185	2265	2345	2425	2510	2595	2680	2765	2855	2945	3035
15'	1945	2025	2100	2180	2265	2345	2430	2515	2605	2695	2785	2875	2970	3065	3160	3260
16'	2080	2165	2245	2330	2420	2510	2600	2690	2785	2880	2975	3075	3175	3275	3375	3480
17'	2215	2305	2395	2485	2575	2670	2770	2865	2965	3065	3170	3275	3380	3485	3595	3710
18'	2355	2445	2540	2635	2735	2835	2935	3040	3145	3255	3360	3475	3585	3700	3815	3935
19'	2490	2590	2690	2790	2895	3000	3105	3215	3325	3440	3555	3675	3790	3910	4035	4160
20'	2625	2730	2835	2940	3050	3165	3275	3390	3510	3630	3750	3870	4000	4125	4255	4385

Len/Diam	68"	69"	70"	71"	72"	73"	74"	75"
4'	875	905	930	960	985	1015	1045	1070
5'	1100	1135	1165	1200	1235	1270	1305	1345
6'	1320	1360	1405	1445	1485	1530	1570	1615
7'	1545	1590	1640	1685	1735	1785	1835	1885
8'	1765	1820	1875	1930	1985	2040	2100	2160
9'	1995	2055	2115	2175	2240	2305	2370	2435
10'	2220	2285	2355	2425	2495	2565	2635	2710
11'	2445	2520	2595	2670	2745	2825	2905	2985
12'	2670	2750	2835	2915	3000	3085	3170	3260
13'	2900	2985	3075	3165	3255	3350	3445	3540
14'	3130	3225	3320	3415	3515	3615	3715	3815
15'	3360	3460	3560	3665	3770	3880	3985	4095
16'	3590	3695	3805	3915	4030	4140	4260	4375
17'	3820	3935	4050	4170	4290	4410	4535	4660
18'	4055	4175	4300	4425	4550	4680	4810	4940
19'	4285	4415	4545	4675	4810	4945	5085	5225
20'	4520	4655	4790	4930	5070	5215	5360	5505

The following Table shows the International 1/4" Rule volumes, rounded to a ten board feet (10 BF)

Len/Diam	4"	5"	6"	7"	8"	9"	10"	11"	12"	13"	14"	15"	16"	17"	18"	19"
4'	0	0	0	10	10	10	10	20	20	30	30	40	40	50	50	60
5'	0	0	0	0	10	10	20	20	30	30	40	40	50	60	70	80
6'	0	0	10	10	10	20	20	30	30	40	50	50	60	70	80	90
7'	0	0	10	10	10	20	20	30	40	50	50	60	70	80	100	110
8'	0	0	10	10	20	20	30	40	40	50	60	70	80	100	110	120
9'	0	10	10	10	20	30	30	40	50	60	70	80	100	110	120	140
10'	0	10	10	20	20	30	40	50	60	70	80	90	110	120	140	160
11'	0	10	10	20	20	30	40	50	60	80	90	100	120	140	150	170
12'	0	10	10	20	30	40	50	60	70	80	100	110	130	150	170	190
13'	0	10	10	20	30	40	50	60	80	90	110	120	140	160	180	210
14'	0	10	20	20	30	40	60	70	80	100	120	140	160	180	200	220
15'	10	10	20	30	40	50	60	70	90	110	130	150	170	190	220	240
16'	10	10	20	30	40	50	60	80	100	120	140	160	180	210	230	260
17'	10	10	20	30	40	60	70	90	100	120	150	170	190	220	250	280
18'	10	10	20	30	50	60	80	90	110	130	160	180	210	240	270	300
19'	10	20	20	40	50	60	80	100	120	140	170	190	220	250	280	320
20'	10	20	30	40	50	70	90	110	130	150	180	200	230	270	300	330

Len/Diam	20"	21"	22"	23"	24"	25"	26"	27"	28"	29"	30"	31"	32"	33"	34"	35"
4'	70	70	80	90	100	110	120	130	140	150	160	170	180	200	210	220
5'	80	90	100	110	130	140	150	160	170	190	200	220	230	250	260	280
6'	100	110	130	140	150	160	180	190	210	230	240	260	280	300	320	340
7'	120	130	150	160	180	190	210	230	250	260	280	300	330	350	370	390
8'	140	150	170	190	200	220	240	260	280	300	330	350	370	400	420	450
9'	160	170	190	210	230	250	270	300	320	340	370	390	420	450	480	510
10'	170	190	210	240	260	280	300	330	360	380	410	440	470	500	530	570
11'	190	210	240	260	280	310	340	360	390	420	450	490	520	550	590	630
12'	210	230	260	280	310	340	370	400	430	460	500	530	570	610	640	680
13'	230	260	280	310	340	370	400	430	470	500	540	580	620	660	700	740
14'	250	280	310	340	370	400	430	470	510	550	590	630	670	710	760	810
15'	270	300	330	360	400	430	470	510	550	590	630	670	720	770	820	870
16'	290	320	350	390	420	460	500	540	580	630	670	720	770	820	870	930
17'	310	340	380	420	450	490	540	580	620	670	720	770	820	880	930	990
18'	330	370	400	440	480	530	570	620	660	710	770	820	870	930	990	1050
19'	350	390	430	470	510	560	600	650	700	760	810	870	930	990	1050	1110
20'	370	410	450	500	540	590	640	690	740	800	860	920	980	1040	1110	1180

Len/Diam	36"	37"	38"	39"	40"	41"	42"	43"	44"	45"	46"	47"	48"	49"	50"	51"
4'	230	250	260	280	290	310	320	340	360	370	390	410	430	450	470	490
5'	300	315	330	350	370	390	410	430	450	470	490	510	540	560	580	610
6'	360	375	400	420	440	470	490	510	540	570	590	620	650	670	700	730
7'	420	440	470	490	520	550	570	600	630	660	690	720	760	790	820	860
8'	480	505	530	560	590	620	660	690	720	760	790	830	870	900	940	980
9'	540	570	600	640	670	710	740	780	820	860	890	940	980	1020	1060	1110
10'	600	635	670	710	750	790	830	870	910	950	1000	1040	1090	1140	1180	1230
11'	660	700	740	780	820	870	910	960	1000	1050	1100	1150	1200	1250	1300	1360
12'	730	770	810	860	900	950	1000	1050	1100	1150	1200	1260	1310	1370	1430	1490
13'	790	835	880	930	980	1030	1080	1140	1190	1250	1310	1370	1430	1490	1550	1610
14'	850	905	950	1010	1060	1110	1170	1230	1290	1350	1410	1470	1540	1610	1670	1740
15'	920	970	1030	1080	1140	1200	1260	1320	1380	1450	1520	1580	1650	1720	1800	1870
16'	980	1040	1100	1160	1220	1280	1350	1410	1480	1550	1620	1690	1770	1840	1920	2000
17'	1050	1110	1170	1230	1300	1370	1440	1510	1580	1650	1730	1810	1880	1960	2050	2130
18'	1110	1175	1240	1310	1380	1450	1520	1600	1680	1750	1830	1920	2000	2090	2170	2260
19'	1180	1245	1320	1390	1460	1540	1610	1690	1770	1860	1940	2030	2120	2210	2300	2390
20'	1240	1315	1390	1460	1540	1620	1700	1790	1870	1960	2050	2140	2230	2330	2430	2530

Len/Diam	52"	53"	54"	55"	56"	57"	58"	59"	60"	61"	62"	63"	64"	65"	66"	67"
4'	500	530	550	570	590	610	630	660	680	700	730	750	770	800	820	850
5'	630	660	680	710	740	770	790	820	850	880	910	940	970	1000	1030	1070
6'	760	790	820	860	890	920	950	990	1020	1060	1090	1130	1170	1210	1240	1280
7'	890	930	960	1000	1040	1080	1120	1160	1200	1240	1280	1320	1360	1410	1450	1500
8'	1020	1060	1100	1140	1190	1230	1280	1320	1370	1420	1460	1510	1560	1610	1660	1710
9'	1150	1200	1240	1290	1340	1390	1440	1490	1540	1600	1650	1710	1760	1820	1880	1930
10'	1280	1330	1390	1440	1490	1550	1600	1660	1720	1780	1840	1900	1960	2020	2090	2150
11'	1410	1470	1530	1590	1650	1710	1770	1830	1890	1960	2030	2090	2160	2230	2300	2370
12'	1550	1610	1670	1730	1800	1860	1930	2000	2070	2140	2210	2290	2360	2440	2510	2590
13'	1680	1750	1810	1880	1950	2030	2100	2170	2250	2330	2400	2480	2560	2650	2730	2810
14'	1810	1880	1960	2030	2110	2190	2260	2340	2430	2510	2590	2680	2770	2860	2950	3040
15'	1950	2020	2100	2180	2260	2350	2430	2520	2600	2690	2780	2880	2970	3060	3160	3260
16'	2080	2160	2250	2330	2420	2510	2600	2690	2780	2880	2970	3070	3170	3270	3380	3480
17'	2220	2300	2390	2480	2580	2670	2770	2870	2960	3070	3170	3270	3380	3490	3600	3710
18'	2350	2450	2540	2640	2740	2840	2940	3040	3150	3250	3360	3470	3590	3700	3820	3930
19'	2490	2590	2690	2790	2890	3000	3110	3220	3330	3440	3560	3670	3790	3910	4030	4160
20'	2630	2730	2840	2940	3050	3160	3280	3390	3510	3630	3750	3870	4000	4120	4250	4390

Len/Diam	68"	69"	70"	71"	72"	73"	74"	75"
4'	880	900	930	960	990	1010	1040	1070
5'	1100	1130	1170	1200	1240	1270	1310	1340
6'	1320	1360	1400	1440	1490	1530	1570	1610
7'	1540	1590	1640	1690	1740	1790	1840	1890
8'	1770	1820	1870	1930	1990	2040	2100	2160
9'	1990	2050	2110	2180	2240	2300	2370	2430
10'	2220	2290	2350	2420	2490	2560	2640	2710
11'	2440	2520	2590	2670	2750	2820	2900	2980
12'	2670	2750	2830	2920	3000	3090	3170	3260
13'	2900	2990	3080	3170	3260	3350	3440	3540
14'	3130	3220	3320	3420	3510	3610	3710	3820
15'	3360	3460	3560	3670	3770	3880	3990	4100
16'	3590	3700	3800	3920	4030	4140	4260	4380
17'	3820	3940	4050	4170	4290	4410	4530	4660
18'	4050	4170	4300	4420	4550	4680	4810	4940
19'	4290	4410	4540	4680	4810	4950	5080	5220
20'	4520	4650	4790	4930	5070	5210	5360	5510