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Wide Flange Steel I Beam: W12 × 30
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Single Span » 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 a single span, the maximum displacement w_max and the maximum normal stress stress_max occur at the center 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
   
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 7.54 × 10-6 10.5
40.0 1.01 × 10-5 14.0
50.0 1.26 × 10-5 17.5
60.0 1.51 × 10-5 21.0
70.0 1.76 × 10-5 24.5
80.0 2.01 × 10-5 28.0
90.0 2.26 × 10-5 31.5
100 2.51 × 10-5 35.0
200 5.03 × 10-5 70.0
300 7.54 × 10-5 105
400 1.01 × 10-4 140
500 1.26 × 10-4 175
600 1.51 × 10-4 210
700 1.76 × 10-4 245
800 2.01 × 10-4 280
900 2.26 × 10-4 315
1000 2.51 × 10-4 350
2000 5.03 × 10-4 700
3000 7.54 × 10-4 1050
4000 0.00101 1400
5000 0.00126 1750
6000 0.00151 2100
7000 0.00176 2450
8000 0.00201 2800
9000 0.00226 3150
1.00 × 104 0.00251 3500
2.00 × 104 0.00503 7000
3.00 × 104 0.00754 1.05 × 104
4.00 × 104 0.0101 1.40 × 104
5.00 × 104 0.0126 1.75 × 104
6.00 × 104 0.0151 2.10 × 104
7.00 × 104 0.0176 2.45 × 104
8.00 × 104 0.0201 2.80 × 104
9.00 × 104 0.0226 3.15 × 104
1.00 × 105 0.0251 3.50 × 104
2.00 × 105 0.0503 7.00 × 104
3.00 × 105 0.0754 1.05 × 105
4.00 × 105 0.101 1.40 × 105
5.00 × 105 0.126 1.75 × 105
6.00 × 105 0.151 2.10 × 105
7.00 × 105 0.176 2.45 × 105
8.00 × 105 0.201 2.80 × 105
8.49 × 105 0.213 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 5.82 × 10-5 29.2
40.0 7.76 × 10-5 38.9
50.0 9.70 × 10-5 48.6
60.0 1.16 × 10-4 58.3
70.0 1.36 × 10-4 68.1
80.0 1.55 × 10-4 77.8
90.0 1.75 × 10-4 87.5
100 1.94 × 10-4 97.2
200 3.88 × 10-4 194
300 5.82 × 10-4 292
400 7.76 × 10-4 389
500 9.70 × 10-4 486
600 0.00116 583
700 0.00136 681
800 0.00155 778
900 0.00175 875
1000 0.00194 972
2000 0.00388 1940
3000 0.00582 2920
4000 0.00776 3890
5000 0.00970 4860
6000 0.0116 5830
7000 0.0136 6810
8000 0.0155 7780
9000 0.0175 8750
1.00 × 104 0.0194 9720
2.00 × 104 0.0388 1.94 × 104
3.00 × 104 0.0582 2.92 × 104
4.00 × 104 0.0776 3.89 × 104
5.00 × 104 0.0970 4.86 × 104
6.00 × 104 0.116 5.83 × 104
7.00 × 104 0.136 6.81 × 104
8.00 × 104 0.155 7.78 × 104
9.00 × 104 0.175 8.75 × 104
1.00 × 105 0.194 9.72 × 104
2.00 × 105 0.388 1.94 × 105
3.00 × 105 0.582 2.92 × 105
3.06 × 105 0.593 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 9.31 × 10-4 117
40.0 0.00124 156
50.0 0.00155 194
60.0 0.00186 233
70.0 0.00217 272
80.0 0.00248 311
90.0 0.00279 350
100 0.00310 389
200 0.00621 778
300 0.00931 1170
400 0.0124 1560
500 0.0155 1940
600 0.0186 2330
700 0.0217 2720
800 0.0248 3110
900 0.0279 3500
1000 0.0310 3890
2000 0.0621 7780
3000 0.0931 1.17 × 104
4000 0.124 1.56 × 104
5000 0.155 1.94 × 104
6000 0.186 2.33 × 104
7000 0.217 2.72 × 104
8000 0.248 3.11 × 104
9000 0.279 3.50 × 104
1.00 × 104 0.310 3.89 × 104
2.00 × 104 0.621 7.78 × 104
3.00 × 104 0.931 1.17 × 105
4.00 × 104 1.24 1.56 × 105
5.00 × 104 1.55 1.94 × 105
6.00 × 104 1.86 2.33 × 105
7.00 × 104 2.17 2.72 × 105
7.64 × 104 2.37 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 0.00471 262
40.0 0.00629 350
50.0 0.00786 437
60.0 0.00943 525
70.0 0.0110 612
80.0 0.0126 700
90.0 0.0141 787
100 0.0157 875
200 0.0314 1750
300 0.0471 2620
400 0.0629 3500
500 0.0786 4370
600 0.0943 5250
700 0.110 6120
800 0.126 7000
900 0.141 7870
1000 0.157 8750
2000 0.314 1.75 × 104
3000 0.471 2.62 × 104
4000 0.629 3.50 × 104
5000 0.786 4.37 × 104
6000 0.943 5.25 × 104
7000 1.10 6.12 × 104
8000 1.26 7.00 × 104
9000 1.41 7.87 × 104
1.00 × 104 1.57 8.75 × 104
2.00 × 104 3.14 1.75 × 105
3.00 × 104 4.71 2.62 × 105
3.39 × 104 5.33 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 0.0149 467
40.0 0.0199 622
50.0 0.0248 778
60.0 0.0298 933
70.0 0.0348 1090
80.0 0.0397 1240
90.0 0.0447 1400
100 0.0497 1560
200 0.0993 3110
300 0.149 4670
400 0.199 6220
500 0.248 7780
600 0.298 9330
700 0.348 1.09 × 104
800 0.397 1.24 × 104
900 0.447 1.40 × 104
1000 0.497 1.56 × 104
2000 0.993 3.11 × 104
3000 1.49 4.67 × 104
4000 1.99 6.22 × 104
5000 2.48 7.78 × 104
6000 2.98 9.33 × 104
7000 3.48 1.09 × 105
8000 3.97 1.24 × 105
9000 4.47 1.40 × 105
1.00 × 104 4.97 1.56 × 105
1.91 × 104 9.48 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 0.0364 729
40.0 0.0485 972
50.0 0.0606 1220
60.0 0.0727 1460
70.0 0.0849 1700
80.0 0.0970 1940
90.0 0.109 2190
100 0.121 2430
200 0.242 4860
300 0.364 7290
400 0.485 9720
500 0.606 1.22 × 104
600 0.727 1.46 × 104
700 0.849 1.70 × 104
800 0.970 1.94 × 104
900 1.09 2.19 × 104
1000 1.21 2.43 × 104
2000 2.42 4.86 × 104
3000 3.64 7.29 × 104
4000 4.85 9.72 × 104
5000 6.06 1.22 × 105
6000 7.27 1.46 × 105
7000 8.49 1.70 × 105
8000 9.70 1.94 × 105
9000 10.9 2.19 × 105
1.00 × 104 12.1 2.43 × 105
1.22 × 104 14.8 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 0.0754 1050
40.0 0.101 1400
50.0 0.126 1750
60.0 0.151 2100
70.0 0.176 2450
80.0 0.201 2800
90.0 0.226 3150
100 0.251 3500
200 0.503 7000
300 0.754 1.05 × 104
400 1.01 1.40 × 104
500 1.26 1.75 × 104
600 1.51 2.10 × 104
700 1.76 2.45 × 104
800 2.01 2.80 × 104
900 2.26 3.15 × 104
1000 2.51 3.50 × 104
2000 5.03 7.00 × 104
3000 7.54 1.05 × 105
4000 10.1 1.40 × 105
4910 12.3 1.72 × 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 0.238 1870
40.0 0.318 2490
50.0 0.397 3110
60.0 0.477 3730
70.0 0.556 4360
80.0 0.636 4980
90.0 0.715 5600
100 0.795 6220
200 1.59 1.24 × 104
300 2.38 1.87 × 104
400 3.18 2.49 × 104
500 3.97 3.11 × 104
600 4.77 3.73 × 104
700 5.56 4.36 × 104
800 6.36 4.98 × 104
900 7.15 5.60 × 104
1000 7.95 6.22 × 104
1550 12.3 9.66 × 104
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 0.582 2920
40.0 0.776 3890
50.0 0.970 4860
60.0 1.16 5830
70.0 1.36 6810
80.0 1.55 7780
90.0 1.75 8750
100 1.94 9720
200 3.88 1.94 × 104
300 5.82 2.92 × 104
400 7.76 3.89 × 104
500 9.70 4.86 × 104
600 11.6 5.83 × 104
636 12.3 6.18 × 104
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 1.21 4200
40.0 1.61 5600
50.0 2.01 7000
60.0 2.41 8400
70.0 2.82 9800
80.0 3.22 1.12 × 104
90.0 3.62 1.26 × 104
100 4.02 1.40 × 104
200 8.05 2.80 × 104
300 12.1 4.20 × 104
307 12.3 4.29 × 104
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 2.24 5720
40.0 2.98 7620
50.0 3.73 9530
60.0 4.47 1.14 × 104
70.0 5.22 1.33 × 104
80.0 5.96 1.52 × 104
90.0 6.71 1.71 × 104
100 7.45 1.91 × 104
166 12.3 3.16 × 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 3.81 7470
40.0 5.09 9950
50.0 6.36 1.24 × 104
60.0 7.63 1.49 × 104
70.0 8.90 1.74 × 104
80.0 10.2 1.99 × 104
90.0 11.4 2.24 × 104
97.1 12.3 2.42 × 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 6.11 9450
40.0 8.15 1.26 × 104
50.0 10.2 1.57 × 104
60.0 12.2 1.89 × 104
60.6 12.3 1.91 × 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 9.31 1.17 × 104
39.8 12.3 1.55 × 104
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