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Wide Flange Steel I Beam: W12 × 30
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Two Equal Spans » Wide Flange Steel I Beam » W12 × 30
Wide Flange Steel I Beam | Single Span | Two Equal Spans | Three Equal Spans | Four Equal Spans

For a simply supported beam in two equal spans, we compute the displacement at the middle of each span w_mid and the maximum normal stress stress_max occuring at the center support of the beam.
The tabulated data listed in this page are calculated based on the area moment of inertia (Ixx = 238 in4) for the W12 × 30 Wide Flange Steel I Beam and the typical Young's modulus (E = 3.046 × 107 psi) of steels. Note that the typical yielding stress Yield of steels can range from 1.015 × 104 to 2.970 × 105 psi. The purpose of this page is to give a rough estimation of the load-bearing capacity of this particular beam, rather than a guideline for designing actual building structures. Please check your local building codes for regulatory requirements.

Note: The weight of the beam itself is not included in the calculation.
L = 3 ft
L = 5 ft
L = 10 ft
L = 15 ft
L = 20 ft
L = 25 ft
L = 30 ft
L = 40 ft
L = 50 ft
L = 60 ft
L = 70 ft
L = 80 ft
L = 90 ft
L = 100 ft
L = 125 ft
  
Steel I Beam: W12 × 30 (Wide Flange 12 inch tall × 30 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
30.0 3.02 × 10-6 10.5
40.0 4.02 × 10-6 14.0
50.0 5.03 × 10-6 17.5
60.0 6.03 × 10-6 21.0
70.0 7.04 × 10-6 24.5
80.0 8.05 × 10-6 28.0
90.0 9.05 × 10-6 31.5
100 1.01 × 10-5 35.0
200 2.01 × 10-5 70.0
300 3.02 × 10-5 105
400 4.02 × 10-5 140
500 5.03 × 10-5 175
600 6.03 × 10-5 210
700 7.04 × 10-5 245
800 8.05 × 10-5 280
900 9.05 × 10-5 315
1000 1.01 × 10-4 350
2000 2.01 × 10-4 700
3000 3.02 × 10-4 1050
4000 4.02 × 10-4 1400
5000 5.03 × 10-4 1750
6000 6.03 × 10-4 2100
7000 7.04 × 10-4 2450
8000 8.05 × 10-4 2800
9000 9.05 × 10-4 3150
1.00 × 104 0.00101 3500
2.00 × 104 0.00201 7000
3.00 × 104 0.00302 1.05 × 104
4.00 × 104 0.00402 1.40 × 104
5.00 × 104 0.00503 1.75 × 104
6.00 × 104 0.00603 2.10 × 104
7.00 × 104 0.00704 2.45 × 104
8.00 × 104 0.00805 2.80 × 104
9.00 × 104 0.00905 3.15 × 104
1.00 × 105 0.0101 3.50 × 104
2.00 × 105 0.0201 7.00 × 104
3.00 × 105 0.0302 1.05 × 105
4.00 × 105 0.0402 1.40 × 105
5.00 × 105 0.0503 1.75 × 105
6.00 × 105 0.0603 2.10 × 105
7.00 × 105 0.0704 2.45 × 105
8.00 × 105 0.0805 2.80 × 105
8.49 × 105 0.0854 2.97 × 105
Steel I Beam: W12 × 30 (Wide Flange 12 inch tall × 30 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
30.0 2.33 × 10-5 29.2
40.0 3.10 × 10-5 38.9
50.0 3.88 × 10-5 48.6
60.0 4.66 × 10-5 58.3
70.0 5.43 × 10-5 68.1
80.0 6.21 × 10-5 77.8
90.0 6.98 × 10-5 87.5
100 7.76 × 10-5 97.2
200 1.55 × 10-4 194
300 2.33 × 10-4 292
400 3.10 × 10-4 389
500 3.88 × 10-4 486
600 4.66 × 10-4 583
700 5.43 × 10-4 681
800 6.21 × 10-4 778
900 6.98 × 10-4 875
1000 7.76 × 10-4 972
2000 0.00155 1940
3000 0.00233 2920
4000 0.00310 3890
5000 0.00388 4860
6000 0.00466 5830
7000 0.00543 6810
8000 0.00621 7780
9000 0.00698 8750
1.00 × 104 0.00776 9720
2.00 × 104 0.0155 1.94 × 104
3.00 × 104 0.0233 2.92 × 104
4.00 × 104 0.0310 3.89 × 104
5.00 × 104 0.0388 4.86 × 104
6.00 × 104 0.0466 5.83 × 104
7.00 × 104 0.0543 6.81 × 104
8.00 × 104 0.0621 7.78 × 104
9.00 × 104 0.0698 8.75 × 104
1.00 × 105 0.0776 9.72 × 104
2.00 × 105 0.155 1.94 × 105
3.00 × 105 0.233 2.92 × 105
3.06 × 105 0.237 2.97 × 105
Steel I Beam: W12 × 30 (Wide Flange 12 inch tall × 30 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
30.0 3.72 × 10-4 117
40.0 4.97 × 10-4 156
50.0 6.21 × 10-4 194
60.0 7.45 × 10-4 233
70.0 8.69 × 10-4 272
80.0 9.93 × 10-4 311
90.0 0.00112 350
100 0.00124 389
200 0.00248 778
300 0.00372 1170
400 0.00497 1560
500 0.00621 1940
600 0.00745 2330
700 0.00869 2720
800 0.00993 3110
900 0.0112 3500
1000 0.0124 3890
2000 0.0248 7780
3000 0.0372 1.17 × 104
4000 0.0497 1.56 × 104
5000 0.0621 1.94 × 104
6000 0.0745 2.33 × 104
7000 0.0869 2.72 × 104
8000 0.0993 3.11 × 104
9000 0.112 3.50 × 104
1.00 × 104 0.124 3.89 × 104
2.00 × 104 0.248 7.78 × 104
3.00 × 104 0.372 1.17 × 105
4.00 × 104 0.497 1.56 × 105
5.00 × 104 0.621 1.94 × 105
6.00 × 104 0.745 2.33 × 105
7.00 × 104 0.869 2.72 × 105
7.64 × 104 0.948 2.97 × 105
Steel I Beam: W12 × 30 (Wide Flange 12 inch tall × 30 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
30.0 0.00189 262
40.0 0.00251 350
50.0 0.00314 437
60.0 0.00377 525
70.0 0.00440 612
80.0 0.00503 700
90.0 0.00566 787
100 0.00629 875
200 0.0126 1750
300 0.0189 2620
400 0.0251 3500
500 0.0314 4370
600 0.0377 5250
700 0.0440 6120
800 0.0503 7000
900 0.0566 7870
1000 0.0629 8750
2000 0.126 1.75 × 104
3000 0.189 2.62 × 104
4000 0.251 3.50 × 104
5000 0.314 4.37 × 104
6000 0.377 5.25 × 104
7000 0.440 6.12 × 104
8000 0.503 7.00 × 104
9000 0.566 7.87 × 104
1.00 × 104 0.629 8.75 × 104
2.00 × 104 1.26 1.75 × 105
3.00 × 104 1.89 2.62 × 105
3.39 × 104 2.13 2.97 × 105
Steel I Beam: W12 × 30 (Wide Flange 12 inch tall × 30 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
30.0 0.00596 467
40.0 0.00795 622
50.0 0.00993 778
60.0 0.0119 933
70.0 0.0139 1090
80.0 0.0159 1240
90.0 0.0179 1400
100 0.0199 1560
200 0.0397 3110
300 0.0596 4670
400 0.0795 6220
500 0.0993 7780
600 0.119 9330
700 0.139 1.09 × 104
800 0.159 1.24 × 104
900 0.179 1.40 × 104
1000 0.199 1.56 × 104
2000 0.397 3.11 × 104
3000 0.596 4.67 × 104
4000 0.795 6.22 × 104
5000 0.993 7.78 × 104
6000 1.19 9.33 × 104
7000 1.39 1.09 × 105
8000 1.59 1.24 × 105
9000 1.79 1.40 × 105
1.00 × 104 1.99 1.56 × 105
1.91 × 104 3.79 2.97 × 105
Steel I Beam: W12 × 30 (Wide Flange 12 inch tall × 30 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
30.0 0.0145 729
40.0 0.0194 972
50.0 0.0242 1220
60.0 0.0291 1460
70.0 0.0339 1700
80.0 0.0388 1940
90.0 0.0436 2190
100 0.0485 2430
200 0.0970 4860
300 0.145 7290
400 0.194 9720
500 0.242 1.22 × 104
600 0.291 1.46 × 104
700 0.339 1.70 × 104
800 0.388 1.94 × 104
900 0.436 2.19 × 104
1000 0.485 2.43 × 104
2000 0.970 4.86 × 104
3000 1.45 7.29 × 104
4000 1.94 9.72 × 104
5000 2.42 1.22 × 105
6000 2.91 1.46 × 105
7000 3.39 1.70 × 105
8000 3.88 1.94 × 105
9000 4.36 2.19 × 105
1.00 × 104 4.85 2.43 × 105
1.22 × 104 5.93 2.97 × 105
Steel I Beam: W12 × 30 (Wide Flange 12 inch tall × 30 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
30.0 0.0302 1050
40.0 0.0402 1400
50.0 0.0503 1750
60.0 0.0603 2100
70.0 0.0704 2450
80.0 0.0805 2800
90.0 0.0905 3150
100 0.101 3500
200 0.201 7000
300 0.302 1.05 × 104
400 0.402 1.40 × 104
500 0.503 1.75 × 104
600 0.603 2.10 × 104
700 0.704 2.45 × 104
800 0.805 2.80 × 104
900 0.905 3.15 × 104
1000 1.01 3.50 × 104
2000 2.01 7.00 × 104
3000 3.02 1.05 × 105
4000 4.02 1.40 × 105
5000 5.03 1.75 × 105
6000 6.03 2.10 × 105
7000 7.04 2.45 × 105
8000 8.05 2.80 × 105
8490 8.54 2.97 × 105
Steel I Beam: W12 × 30 (Wide Flange 12 inch tall × 30 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
30.0 0.0954 1870
40.0 0.127 2490
50.0 0.159 3110
60.0 0.191 3730
70.0 0.222 4360
80.0 0.254 4980
90.0 0.286 5600
100 0.318 6220
200 0.636 1.24 × 104
300 0.954 1.87 × 104
400 1.27 2.49 × 104
500 1.59 3.11 × 104
600 1.91 3.73 × 104
700 2.22 4.36 × 104
800 2.54 4.98 × 104
900 2.86 5.60 × 104
1000 3.18 6.22 × 104
2000 6.36 1.24 × 105
3000 9.54 1.87 × 105
3880 12.3 2.42 × 105
Steel I Beam: W12 × 30 (Wide Flange 12 inch tall × 30 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
30.0 0.233 2920
40.0 0.310 3890
50.0 0.388 4860
60.0 0.466 5830
70.0 0.543 6810
80.0 0.621 7780
90.0 0.698 8750
100 0.776 9720
200 1.55 1.94 × 104
300 2.33 2.92 × 104
400 3.10 3.89 × 104
500 3.88 4.86 × 104
600 4.66 5.83 × 104
700 5.43 6.81 × 104
800 6.21 7.78 × 104
900 6.98 8.75 × 104
1000 7.76 9.72 × 104
1590 12.3 1.55 × 105
Steel I Beam: W12 × 30 (Wide Flange 12 inch tall × 30 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
30.0 0.483 4200
40.0 0.644 5600
50.0 0.805 7000
60.0 0.965 8400
70.0 1.13 9800
80.0 1.29 1.12 × 104
90.0 1.45 1.26 × 104
100 1.61 1.40 × 104
200 3.22 2.80 × 104
300 4.83 4.20 × 104
400 6.44 5.60 × 104
500 8.05 7.00 × 104
600 9.65 8.40 × 104
700 11.3 9.80 × 104
767 12.3 1.07 × 105
Steel I Beam: W12 × 30 (Wide Flange 12 inch tall × 30 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
30.0 0.894 5720
40.0 1.19 7620
50.0 1.49 9530
60.0 1.79 1.14 × 104
70.0 2.09 1.33 × 104
80.0 2.38 1.52 × 104
90.0 2.68 1.71 × 104
100 2.98 1.91 × 104
200 5.96 3.81 × 104
300 8.94 5.72 × 104
400 11.9 7.62 × 104
414 12.3 7.89 × 104
Steel I Beam: W12 × 30 (Wide Flange 12 inch tall × 30 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
30.0 1.53 7470
40.0 2.03 9950
50.0 2.54 1.24 × 104
60.0 3.05 1.49 × 104
70.0 3.56 1.74 × 104
80.0 4.07 1.99 × 104
90.0 4.58 2.24 × 104
100 5.09 2.49 × 104
200 10.2 4.98 × 104
243 12.3 6.04 × 104
Steel I Beam: W12 × 30 (Wide Flange 12 inch tall × 30 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
30.0 2.44 9450
40.0 3.26 1.26 × 104
50.0 4.07 1.57 × 104
60.0 4.89 1.89 × 104
70.0 5.70 2.20 × 104
80.0 6.52 2.52 × 104
90.0 7.33 2.83 × 104
100 8.15 3.15 × 104
151 12.3 4.77 × 104
Steel I Beam: W12 × 30 (Wide Flange 12 inch tall × 30 lbf/ft)
L = 100 ft
P (lbf/ft) w_max (in) stress_max (psi)
30.0 3.72 1.17 × 104
40.0 4.97 1.56 × 104
50.0 6.21 1.94 × 104
60.0 7.45 2.33 × 104
70.0 8.69 2.72 × 104
80.0 9.93 3.11 × 104
90.0 11.2 3.50 × 104
99.4 12.3 3.87 × 104
Steel I Beam: W12 × 30 (Wide Flange 12 inch tall × 30 lbf/ft)
L = 125 ft
P (lbf/ft) w_max (in) stress_max (psi)
30.0 9.09 1.82 × 104
40.0 12.1 2.43 × 104
40.7 12.3 2.47 × 104
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