IdBL Square Inch Conversion Chart
division A (industry)
1-720.99 sq. inches
721-2160.99 sq. inches
division B (consumer)
1-160.99 sq. inches
361-720.99 sq.inches
721-1440.99 sq. inches
1441-2160.99 sq. inches
2161+ sq. inches
Woofer Diameter
6.5
8
10
12
15
18
Woofer Quantity
Total Square Inches
1
33.17
50.24
78.50
113.04
176.63
254.34
2
66.33
100.48
157.00
226.08
353.25
508.68
3
99.49
150.72
235.50
339.12
529.87
763.02
4
132.65
200.96
314.00
452.16
706.49
1017.36
5
165.81
251.20
392.50
565.20
883.11
1271.70
6
198.97
301.44
471.00
678.24
1059.73
1526.04
7
232.13
351.68
549.50
791.28
1236.35
1780.38
265.29
401.92
628.00
904.32
1412.97
2034.72
9
298.45
706.50
1589.59
2289.06
331.61
502.40
785.00
1130.40
1766.21
2543.40
11
364.77
552.64
863.50
1243.44
1942.83
2797.74
397.93
602.88
942.00
1356.48
2119.45
3052.08
13
431.09
653.12
1020.50
1469.52
2296.07
3306.42
14
464.25
703.36
1099.00
1582.56
2472.69
3560.76
497.41
753.60
1177.50
1695.60
2649.31
3815.10
16
530.57
803.84
1256.00
1808.64
2825.93
4069.44
17
563.73
854.08
1334.50
1921.68
3002.55
4323.78
596.89
1413.00
3179.17
4578.12
19
630.05
954.56
1491.50
2147.76
3355.79
4832.46
20
663.21
1004.80
1570.00
2260.80
3532.41
5086.80
21
696.37
1055.04
1648.50
2373.84
3709.03
5341.14
22
729.53
1105.28
1727.00
2486.88
3885.65
5595.48
23
762.69
1155.52
1805.50
2599.92
4062.27
5849.82
24
795.85
1205.76
1884.00
2712.96
4238.89
6104.16
25
829.01
1962.50
2826.00
4415.51
6358.50
26
862.17
1306.24
2041.00
2939.04
4592.13
6612.84
27
895.33
2119.50
4768.75
6867.18
28
928.49
1406.72
2198.00
3165.12
4945.37
7121.52
29
961.65
1456.96
2276.50
3278.16
5121.99
7375.86
30
994.81
1507.20
2355.00
3391.20
5298.61
7630.20
31
1027.97
1557.44
2433.50
3504.24
5475.23
7884.54
32
1061.13
1607.68
2512.00
3617.28
5651.85
8138.88
33
1094.29
1657.92
2590.50
3730.32
5828.47
8393.22
34
1127.45
1708.16
2669.00
3843.36
6005.09
8647.56
35
1160.61
1758.40
2747.50
3956.40
6181.71
8901.90
36
1193.77
6358.33
9156.24
37
1226.93
1858.88
2904.50
4182.48
6534.95
9410.58
38
1260.09
1909.12
2983.00
4295.52
6711.57
9664.92
39
1293.25
1959.36
3061.50
4408.56
6888.19
9919.26
40
1326.41
2009.60
3140.00
4521.60
7064.81
10173.60
41
1359.57
2059.84
3218.50
4634.64
7241.43
10427.94
42
1392.73
2110.08
3297.00
4747.68
7418.05
10682.28
43
1425.89
2160.32
3375.50
4860.72
7594.67
10936.62
44
1459.05
2210.56
3454.00
4973.76
7771.29
11190.96
45
1492.21
3532.50
7947.91
11445.30
46
1525.37
2311.04
3611.00
5199.84
8124.53
11699.64
47
1558.53
2361.28
3689.50
5312.88
8301.15
11953.98
48
1591.69
2411.52
3768.00
5425.92
8477.77
12208.32
49
1624.85
2461.76
3846.50
5538.96
8654.39
12462.66
50
1658.01
3925.00
5652.00
8831.01
12717.00
51
1691.17
2562.24
4003.50
5765.04
9007.63
12971.34
52
1724.33
2612.48
4082.00
5878.08
9184.25
13225.68
53
1757.49
2662.72
4160.50
5991.12
9360.87
13480.02
54
1790.65
4239.00
9537.49
13734.36
55
1823.81
2763.20
4317.50
6217.20
9714.11
13988.70
56
1856.97
2813.44
4396.00
6330.24
9890.73
14243.04
57
1890.13
2863.68
4474.50
6443.28
10067.35
14497.38
58
1923.29
2913.92
4553.00
6556.32
10243.97
14751.72
59
1956.45
2964.16
4631.50
6669.36
10420.59
15006.06
60
1989.61
3014.40
4710.00
6782.40
10597.21
15260.40
61
2022.77
3064.64
4788.50
6895.44
10773.83
15514.74
62
2055.93
3114.88
4867.00
7008.48
10950.45
15769.08
63
2089.09
4945.50
11127.07
16023.42
64
2122.25
3215.36
5024.00
7234.56
11303.69
16277.76
converted by: J. B. Schuren (aka The Chiccin, FHLH)
