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Wide Flange Steel I Beam: W18 × 50
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Single Span » Wide Flange Steel I Beam » W18 × 50
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 = 800 in4) for the W18 × 50 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: W18 × 50 (Wide Flange 18 inch tall × 50 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
50.0 3.74 × 10-6 7.59
60.0 4.49 × 10-6 9.11
70.0 5.24 × 10-6 10.6
80.0 5.98 × 10-6 12.1
90.0 6.73 × 10-6 13.7
100 7.48 × 10-6 15.2
200 1.50 × 10-5 30.4
300 2.24 × 10-5 45.5
400 2.99 × 10-5 60.7
500 3.74 × 10-5 75.9
600 4.49 × 10-5 91.1
700 5.24 × 10-5 106
800 5.98 × 10-5 121
900 6.73 × 10-5 137
1000 7.48 × 10-5 152
2000 1.50 × 10-4 304
3000 2.24 × 10-4 455
4000 2.99 × 10-4 607
5000 3.74 × 10-4 759
6000 4.49 × 10-4 911
7000 5.24 × 10-4 1060
8000 5.98 × 10-4 1210
9000 6.73 × 10-4 1370
1.00 × 104 7.48 × 10-4 1520
2.00 × 104 0.00150 3040
3.00 × 104 0.00224 4550
4.00 × 104 0.00299 6070
5.00 × 104 0.00374 7590
6.00 × 104 0.00449 9110
7.00 × 104 0.00524 1.06 × 104
8.00 × 104 0.00598 1.21 × 104
9.00 × 104 0.00673 1.37 × 104
1.00 × 105 0.00748 1.52 × 104
2.00 × 105 0.0150 3.04 × 104
3.00 × 105 0.0224 4.55 × 104
4.00 × 105 0.0299 6.07 × 104
5.00 × 105 0.0374 7.59 × 104
6.00 × 105 0.0449 9.11 × 104
7.00 × 105 0.0524 1.06 × 105
8.00 × 105 0.0598 1.21 × 105
9.00 × 105 0.0673 1.37 × 105
1.00 × 106 0.0748 1.52 × 105
1.96 × 106 0.146 2.97 × 105
Steel I Beam: W18 × 50 (Wide Flange 18 inch tall × 50 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
50.0 2.89 × 10-5 21.1
60.0 3.46 × 10-5 25.3
70.0 4.04 × 10-5 29.5
80.0 4.62 × 10-5 33.7
90.0 5.19 × 10-5 37.9
100 5.77 × 10-5 42.2
200 1.15 × 10-4 84.3
300 1.73 × 10-4 126
400 2.31 × 10-4 169
500 2.89 × 10-4 211
600 3.46 × 10-4 253
700 4.04 × 10-4 295
800 4.62 × 10-4 337
900 5.19 × 10-4 379
1000 5.77 × 10-4 422
2000 0.00115 843
3000 0.00173 1260
4000 0.00231 1690
5000 0.00289 2110
6000 0.00346 2530
7000 0.00404 2950
8000 0.00462 3370
9000 0.00519 3790
1.00 × 104 0.00577 4220
2.00 × 104 0.0115 8430
3.00 × 104 0.0173 1.26 × 104
4.00 × 104 0.0231 1.69 × 104
5.00 × 104 0.0289 2.11 × 104
6.00 × 104 0.0346 2.53 × 104
7.00 × 104 0.0404 2.95 × 104
8.00 × 104 0.0462 3.37 × 104
9.00 × 104 0.0519 3.79 × 104
1.00 × 105 0.0577 4.22 × 104
2.00 × 105 0.115 8.43 × 104
3.00 × 105 0.173 1.26 × 105
4.00 × 105 0.231 1.69 × 105
5.00 × 105 0.289 2.11 × 105
6.00 × 105 0.346 2.53 × 105
7.00 × 105 0.404 2.95 × 105
7.04 × 105 0.407 2.97 × 105
Steel I Beam: W18 × 50 (Wide Flange 18 inch tall × 50 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
50.0 4.62 × 10-4 84.3
60.0 5.54 × 10-4 101
70.0 6.46 × 10-4 118
80.0 7.39 × 10-4 135
90.0 8.31 × 10-4 152
100 9.23 × 10-4 169
200 0.00185 337
300 0.00277 506
400 0.00369 675
500 0.00462 843
600 0.00554 1010
700 0.00646 1180
800 0.00739 1350
900 0.00831 1520
1000 0.00923 1690
2000 0.0185 3370
3000 0.0277 5060
4000 0.0369 6750
5000 0.0462 8430
6000 0.0554 1.01 × 104
7000 0.0646 1.18 × 104
8000 0.0739 1.35 × 104
9000 0.0831 1.52 × 104
1.00 × 104 0.0923 1.69 × 104
2.00 × 104 0.185 3.37 × 104
3.00 × 104 0.277 5.06 × 104
4.00 × 104 0.369 6.75 × 104
5.00 × 104 0.462 8.43 × 104
6.00 × 104 0.554 1.01 × 105
7.00 × 104 0.646 1.18 × 105
8.00 × 104 0.739 1.35 × 105
9.00 × 104 0.831 1.52 × 105
1.00 × 105 0.923 1.69 × 105
1.76 × 105 1.63 2.97 × 105
Steel I Beam: W18 × 50 (Wide Flange 18 inch tall × 50 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
50.0 0.00234 190
60.0 0.00280 228
70.0 0.00327 266
80.0 0.00374 304
90.0 0.00421 342
100 0.00467 379
200 0.00935 759
300 0.0140 1140
400 0.0187 1520
500 0.0234 1900
600 0.0280 2280
700 0.0327 2660
800 0.0374 3040
900 0.0421 3420
1000 0.0467 3790
2000 0.0935 7590
3000 0.140 1.14 × 104
4000 0.187 1.52 × 104
5000 0.234 1.90 × 104
6000 0.280 2.28 × 104
7000 0.327 2.66 × 104
8000 0.374 3.04 × 104
9000 0.421 3.42 × 104
1.00 × 104 0.467 3.79 × 104
2.00 × 104 0.935 7.59 × 104
3.00 × 104 1.40 1.14 × 105
4.00 × 104 1.87 1.52 × 105
5.00 × 104 2.34 1.90 × 105
6.00 × 104 2.80 2.28 × 105
7.00 × 104 3.27 2.66 × 105
7.83 × 104 3.66 2.97 × 105
Steel I Beam: W18 × 50 (Wide Flange 18 inch tall × 50 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
50.0 0.00739 337
60.0 0.00886 405
70.0 0.0103 472
80.0 0.0118 540
90.0 0.0133 607
100 0.0148 675
200 0.0295 1350
300 0.0443 2020
400 0.0591 2700
500 0.0739 3370
600 0.0886 4050
700 0.103 4720
800 0.118 5400
900 0.133 6070
1000 0.148 6750
2000 0.295 1.35 × 104
3000 0.443 2.02 × 104
4000 0.591 2.70 × 104
5000 0.739 3.37 × 104
6000 0.886 4.05 × 104
7000 1.03 4.72 × 104
8000 1.18 5.40 × 104
9000 1.33 6.07 × 104
1.00 × 104 1.48 6.75 × 104
2.00 × 104 2.95 1.35 × 105
3.00 × 104 4.43 2.02 × 105
4.00 × 104 5.91 2.70 × 105
4.40 × 104 6.51 2.97 × 105
Steel I Beam: W18 × 50 (Wide Flange 18 inch tall × 50 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
50.0 0.0180 527
60.0 0.0216 632
70.0 0.0252 738
80.0 0.0289 843
90.0 0.0325 949
100 0.0361 1050
200 0.0721 2110
300 0.108 3160
400 0.144 4220
500 0.180 5270
600 0.216 6320
700 0.252 7380
800 0.289 8430
900 0.325 9490
1000 0.361 1.05 × 104
2000 0.721 2.11 × 104
3000 1.08 3.16 × 104
4000 1.44 4.22 × 104
5000 1.80 5.27 × 104
6000 2.16 6.32 × 104
7000 2.52 7.38 × 104
8000 2.89 8.43 × 104
9000 3.25 9.49 × 104
1.00 × 104 3.61 1.05 × 105
2.00 × 104 7.21 2.11 × 105
2.82 × 104 10.2 2.97 × 105
Steel I Beam: W18 × 50 (Wide Flange 18 inch tall × 50 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
50.0 0.0374 759
60.0 0.0449 911
70.0 0.0524 1060
80.0 0.0598 1210
90.0 0.0673 1370
100 0.0748 1520
200 0.150 3040
300 0.224 4550
400 0.299 6070
500 0.374 7590
600 0.449 9110
700 0.524 1.06 × 104
800 0.598 1.21 × 104
900 0.673 1.37 × 104
1000 0.748 1.52 × 104
2000 1.50 3.04 × 104
3000 2.24 4.55 × 104
4000 2.99 6.07 × 104
5000 3.74 7.59 × 104
6000 4.49 9.11 × 104
7000 5.24 1.06 × 105
8000 5.98 1.21 × 105
9000 6.73 1.37 × 105
1.00 × 104 7.48 1.52 × 105
1.96 × 104 14.6 2.97 × 105
Steel I Beam: W18 × 50 (Wide Flange 18 inch tall × 50 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
50.0 0.118 1350
60.0 0.142 1620
70.0 0.165 1890
80.0 0.189 2160
90.0 0.213 2430
100 0.236 2700
200 0.473 5400
300 0.709 8100
400 0.946 1.08 × 104
500 1.18 1.35 × 104
600 1.42 1.62 × 104
700 1.65 1.89 × 104
800 1.89 2.16 × 104
900 2.13 2.43 × 104
1000 2.36 2.70 × 104
2000 4.73 5.40 × 104
3000 7.09 8.10 × 104
4000 9.46 1.08 × 105
5000 11.8 1.35 × 105
6000 14.2 1.62 × 105
7000 16.5 1.89 × 105
7610 18.0 2.05 × 105
Steel I Beam: W18 × 50 (Wide Flange 18 inch tall × 50 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
50.0 0.289 2110
60.0 0.346 2530
70.0 0.404 2950
80.0 0.462 3370
90.0 0.519 3790
100 0.577 4220
200 1.15 8430
300 1.73 1.26 × 104
400 2.31 1.69 × 104
500 2.89 2.11 × 104
600 3.46 2.53 × 104
700 4.04 2.95 × 104
800 4.62 3.37 × 104
900 5.19 3.79 × 104
1000 5.77 4.22 × 104
2000 11.5 8.43 × 104
3000 17.3 1.26 × 105
3120 18.0 1.31 × 105
Steel I Beam: W18 × 50 (Wide Flange 18 inch tall × 50 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
50.0 0.598 3040
60.0 0.718 3640
70.0 0.838 4250
80.0 0.957 4860
90.0 1.08 5460
100 1.20 6070
200 2.39 1.21 × 104
300 3.59 1.82 × 104
400 4.79 2.43 × 104
500 5.98 3.04 × 104
600 7.18 3.64 × 104
700 8.38 4.25 × 104
800 9.57 4.86 × 104
900 10.8 5.46 × 104
1000 12.0 6.07 × 104
1500 18.0 9.13 × 104
Steel I Beam: W18 × 50 (Wide Flange 18 inch tall × 50 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
50.0 1.11 4130
60.0 1.33 4960
70.0 1.55 5780
80.0 1.77 6610
90.0 2.00 7440
100 2.22 8260
200 4.43 1.65 × 104
300 6.65 2.48 × 104
400 8.87 3.31 × 104
500 11.1 4.13 × 104
600 13.3 4.96 × 104
700 15.5 5.78 × 104
800 17.7 6.61 × 104
811 18.0 6.71 × 104
Steel I Beam: W18 × 50 (Wide Flange 18 inch tall × 50 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
50.0 1.89 5400
60.0 2.27 6480
70.0 2.65 7560
80.0 3.03 8640
90.0 3.40 9710
100 3.78 1.08 × 104
200 7.56 2.16 × 104
300 11.3 3.24 × 104
400 15.1 4.32 × 104
476 18.0 5.13 × 104
Steel I Beam: W18 × 50 (Wide Flange 18 inch tall × 50 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
50.0 3.03 6830
60.0 3.64 8200
70.0 4.24 9560
80.0 4.85 1.09 × 104
90.0 5.45 1.23 × 104
100 6.06 1.37 × 104
200 12.1 2.73 × 104
297 18.0 4.06 × 104
Steel I Beam: W18 × 50 (Wide Flange 18 inch tall × 50 lbf/ft)
L = 100 ft
P (lbf/ft) w_max (in) stress_max (psi)
50.0 4.62 8430
60.0 5.54 1.01 × 104
70.0 6.46 1.18 × 104
80.0 7.39 1.35 × 104
90.0 8.31 1.52 × 104
100 9.23 1.69 × 104
195 18.0 3.29 × 104
Steel I Beam: W18 × 50 (Wide Flange 18 inch tall × 50 lbf/ft)
L = 125 ft
P (lbf/ft) w_max (in) stress_max (psi)
50.0 11.3 1.32 × 104
60.0 13.5 1.58 × 104
70.0 15.8 1.84 × 104
79.8 18.0 2.10 × 104
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