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Wide Flange Steel I Beam: W18 × 65
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Four Equal Spans » Wide Flange Steel I Beam » W18 × 65
Wide Flange Steel I Beam | Single Span | Two Equal Spans | Three Equal Spans | Four Equal Spans

For a simply supported beam in four equal spans, we compute the displacement at the middle of the first and fourth spans, and the maximum normal stress stress_max occuring at the second and fourth supports of the beam.
The tabulated data listed in this page are calculated based on the area moment of inertia (Ixx = 1070 in4) for the W18 × 65 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
L = 150 ft
   
Steel I Beam: W18 × 65 (Wide Flange 18 inch tall × 65 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 1.76 × 10-6 6.45
70.0 1.89 × 10-6 6.94
80.0 2.16 × 10-6 7.93
90.0 2.44 × 10-6 8.93
100 2.71 × 10-6 9.92
200 5.41 × 10-6 19.8
300 8.12 × 10-6 29.8
400 1.08 × 10-5 39.7
500 1.35 × 10-5 49.6
600 1.62 × 10-5 59.5
700 1.89 × 10-5 69.4
800 2.16 × 10-5 79.3
900 2.44 × 10-5 89.3
1000 2.71 × 10-5 99.2
2000 5.41 × 10-5 198
3000 8.12 × 10-5 298
4000 1.08 × 10-4 397
5000 1.35 × 10-4 496
6000 1.62 × 10-4 595
7000 1.89 × 10-4 694
8000 2.16 × 10-4 793
9000 2.44 × 10-4 893
1.00 × 104 2.71 × 10-4 992
2.00 × 104 5.41 × 10-4 1980
3.00 × 104 8.12 × 10-4 2980
4.00 × 104 0.00108 3970
5.00 × 104 0.00135 4960
6.00 × 104 0.00162 5950
7.00 × 104 0.00189 6940
8.00 × 104 0.00216 7930
9.00 × 104 0.00244 8930
1.00 × 105 0.00271 9920
2.00 × 105 0.00541 1.98 × 104
3.00 × 105 0.00812 2.98 × 104
4.00 × 105 0.0108 3.97 × 104
5.00 × 105 0.0135 4.96 × 104
6.00 × 105 0.0162 5.95 × 104
7.00 × 105 0.0189 6.94 × 104
8.00 × 105 0.0216 7.93 × 104
9.00 × 105 0.0244 8.93 × 104
1.00 × 106 0.0271 9.92 × 104
2.00 × 106 0.0541 1.98 × 105
2.99 × 106 0.0810 2.97 × 105
Steel I Beam: W18 × 65 (Wide Flange 18 inch tall × 65 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 1.36 × 10-5 17.9
70.0 1.46 × 10-5 19.3
80.0 1.67 × 10-5 22.0
90.0 1.88 × 10-5 24.8
100 2.09 × 10-5 27.6
200 4.18 × 10-5 55.1
300 6.26 × 10-5 82.7
400 8.35 × 10-5 110
500 1.04 × 10-4 138
600 1.25 × 10-4 165
700 1.46 × 10-4 193
800 1.67 × 10-4 220
900 1.88 × 10-4 248
1000 2.09 × 10-4 276
2000 4.18 × 10-4 551
3000 6.26 × 10-4 827
4000 8.35 × 10-4 1100
5000 0.00104 1380
6000 0.00125 1650
7000 0.00146 1930
8000 0.00167 2200
9000 0.00188 2480
1.00 × 104 0.00209 2760
2.00 × 104 0.00418 5510
3.00 × 104 0.00626 8270
4.00 × 104 0.00835 1.10 × 104
5.00 × 104 0.0104 1.38 × 104
6.00 × 104 0.0125 1.65 × 104
7.00 × 104 0.0146 1.93 × 104
8.00 × 104 0.0167 2.20 × 104
9.00 × 104 0.0188 2.48 × 104
1.00 × 105 0.0209 2.76 × 104
2.00 × 105 0.0418 5.51 × 104
3.00 × 105 0.0626 8.27 × 104
4.00 × 105 0.0835 1.10 × 105
5.00 × 105 0.104 1.38 × 105
6.00 × 105 0.125 1.65 × 105
7.00 × 105 0.146 1.93 × 105
8.00 × 105 0.167 2.20 × 105
9.00 × 105 0.188 2.48 × 105
1.00 × 106 0.209 2.76 × 105
1.08 × 106 0.225 2.97 × 105
Steel I Beam: W18 × 65 (Wide Flange 18 inch tall × 65 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 2.17 × 10-4 71.6
70.0 2.34 × 10-4 77.1
80.0 2.67 × 10-4 88.2
90.0 3.01 × 10-4 99.2
100 3.34 × 10-4 110
200 6.68 × 10-4 220
300 0.00100 331
400 0.00134 441
500 0.00167 551
600 0.00200 661
700 0.00234 771
800 0.00267 882
900 0.00301 992
1000 0.00334 1100
2000 0.00668 2200
3000 0.0100 3310
4000 0.0134 4410
5000 0.0167 5510
6000 0.0200 6610
7000 0.0234 7710
8000 0.0267 8820
9000 0.0301 9920
1.00 × 104 0.0334 1.10 × 104
2.00 × 104 0.0668 2.20 × 104
3.00 × 104 0.100 3.31 × 104
4.00 × 104 0.134 4.41 × 104
5.00 × 104 0.167 5.51 × 104
6.00 × 104 0.200 6.61 × 104
7.00 × 104 0.234 7.71 × 104
8.00 × 104 0.267 8.82 × 104
9.00 × 104 0.301 9.92 × 104
1.00 × 105 0.334 1.10 × 105
2.00 × 105 0.668 2.20 × 105
2.70 × 105 0.900 2.97 × 105
Steel I Beam: W18 × 65 (Wide Flange 18 inch tall × 65 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 0.00110 161
70.0 0.00118 174
80.0 0.00135 198
90.0 0.00152 223
100 0.00169 248
200 0.00338 496
300 0.00507 744
400 0.00676 992
500 0.00846 1240
600 0.0101 1490
700 0.0118 1740
800 0.0135 1980
900 0.0152 2230
1000 0.0169 2480
2000 0.0338 4960
3000 0.0507 7440
4000 0.0676 9920
5000 0.0846 1.24 × 104
6000 0.101 1.49 × 104
7000 0.118 1.74 × 104
8000 0.135 1.98 × 104
9000 0.152 2.23 × 104
1.00 × 104 0.169 2.48 × 104
2.00 × 104 0.338 4.96 × 104
3.00 × 104 0.507 7.44 × 104
4.00 × 104 0.676 9.92 × 104
5.00 × 104 0.846 1.24 × 105
6.00 × 104 1.01 1.49 × 105
7.00 × 104 1.18 1.74 × 105
8.00 × 104 1.35 1.98 × 105
9.00 × 104 1.52 2.23 × 105
1.00 × 105 1.69 2.48 × 105
1.20 × 105 2.03 2.97 × 105
Steel I Beam: W18 × 65 (Wide Flange 18 inch tall × 65 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 0.00347 287
70.0 0.00374 309
80.0 0.00428 353
90.0 0.00481 397
100 0.00534 441
200 0.0107 882
300 0.0160 1320
400 0.0214 1760
500 0.0267 2200
600 0.0321 2640
700 0.0374 3090
800 0.0428 3530
900 0.0481 3970
1000 0.0534 4410
2000 0.107 8820
3000 0.160 1.32 × 104
4000 0.214 1.76 × 104
5000 0.267 2.20 × 104
6000 0.321 2.64 × 104
7000 0.374 3.09 × 104
8000 0.428 3.53 × 104
9000 0.481 3.97 × 104
1.00 × 104 0.534 4.41 × 104
2.00 × 104 1.07 8.82 × 104
3.00 × 104 1.60 1.32 × 105
4.00 × 104 2.14 1.76 × 105
5.00 × 104 2.67 2.20 × 105
6.00 × 104 3.21 2.64 × 105
6.74 × 104 3.60 2.97 × 105
Steel I Beam: W18 × 65 (Wide Flange 18 inch tall × 65 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 0.00848 448
70.0 0.00913 482
80.0 0.0104 551
90.0 0.0117 620
100 0.0130 689
200 0.0261 1380
300 0.0391 2070
400 0.0522 2760
500 0.0652 3440
600 0.0783 4130
700 0.0913 4820
800 0.104 5510
900 0.117 6200
1000 0.130 6890
2000 0.261 1.38 × 104
3000 0.391 2.07 × 104
4000 0.522 2.76 × 104
5000 0.652 3.44 × 104
6000 0.783 4.13 × 104
7000 0.913 4.82 × 104
8000 1.04 5.51 × 104
9000 1.17 6.20 × 104
1.00 × 104 1.30 6.89 × 104
2.00 × 104 2.61 1.38 × 105
3.00 × 104 3.91 2.07 × 105
4.00 × 104 5.22 2.76 × 105
4.31 × 104 5.63 2.97 × 105
Steel I Beam: W18 × 65 (Wide Flange 18 inch tall × 65 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 0.0176 645
70.0 0.0189 694
80.0 0.0216 793
90.0 0.0244 893
100 0.0271 992
200 0.0541 1980
300 0.0812 2980
400 0.108 3970
500 0.135 4960
600 0.162 5950
700 0.189 6940
800 0.216 7930
900 0.244 8930
1000 0.271 9920
2000 0.541 1.98 × 104
3000 0.812 2.98 × 104
4000 1.08 3.97 × 104
5000 1.35 4.96 × 104
6000 1.62 5.95 × 104
7000 1.89 6.94 × 104
8000 2.16 7.93 × 104
9000 2.44 8.93 × 104
1.00 × 104 2.71 9.92 × 104
2.00 × 104 5.41 1.98 × 105
2.99 × 104 8.10 2.97 × 105
Steel I Beam: W18 × 65 (Wide Flange 18 inch tall × 65 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 0.0556 1150
70.0 0.0599 1230
80.0 0.0684 1410
90.0 0.0770 1590
100 0.0855 1760
200 0.171 3530
300 0.257 5290
400 0.342 7050
500 0.428 8820
600 0.513 1.06 × 104
700 0.599 1.23 × 104
800 0.684 1.41 × 104
900 0.770 1.59 × 104
1000 0.855 1.76 × 104
2000 1.71 3.53 × 104
3000 2.57 5.29 × 104
4000 3.42 7.05 × 104
5000 4.28 8.82 × 104
6000 5.13 1.06 × 105
7000 5.99 1.23 × 105
8000 6.84 1.41 × 105
9000 7.70 1.59 × 105
1.00 × 104 8.55 1.76 × 105
1.68 × 104 14.4 2.97 × 105
Steel I Beam: W18 × 65 (Wide Flange 18 inch tall × 65 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 0.136 1790
70.0 0.146 1930
80.0 0.167 2200
90.0 0.188 2480
100 0.209 2760
200 0.418 5510
300 0.626 8270
400 0.835 1.10 × 104
500 1.04 1.38 × 104
600 1.25 1.65 × 104
700 1.46 1.93 × 104
800 1.67 2.20 × 104
900 1.88 2.48 × 104
1000 2.09 2.76 × 104
2000 4.18 5.51 × 104
3000 6.26 8.27 × 104
4000 8.35 1.10 × 105
5000 10.4 1.38 × 105
6000 12.5 1.65 × 105
7000 14.6 1.93 × 105
8000 16.7 2.20 × 105
8790 18.4 2.42 × 105
Steel I Beam: W18 × 65 (Wide Flange 18 inch tall × 65 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 0.281 2580
70.0 0.303 2780
80.0 0.346 3170
90.0 0.390 3570
100 0.433 3970
200 0.866 7930
300 1.30 1.19 × 104
400 1.73 1.59 × 104
500 2.16 1.98 × 104
600 2.60 2.38 × 104
700 3.03 2.78 × 104
800 3.46 3.17 × 104
900 3.90 3.57 × 104
1000 4.33 3.97 × 104
2000 8.66 7.93 × 104
3000 13.0 1.19 × 105
4000 17.3 1.59 × 105
4240 18.4 1.68 × 105
Steel I Beam: W18 × 65 (Wide Flange 18 inch tall × 65 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 0.521 3510
70.0 0.561 3780
80.0 0.642 4320
90.0 0.722 4860
100 0.802 5400
200 1.60 1.08 × 104
300 2.41 1.62 × 104
400 3.21 2.16 × 104
500 4.01 2.70 × 104
600 4.81 3.24 × 104
700 5.61 3.78 × 104
800 6.42 4.32 × 104
900 7.22 4.86 × 104
1000 8.02 5.40 × 104
2000 16.0 1.08 × 105
2290 18.4 1.24 × 105
Steel I Beam: W18 × 65 (Wide Flange 18 inch tall × 65 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 0.889 4580
70.0 0.958 4940
80.0 1.09 5640
90.0 1.23 6350
100 1.37 7050
200 2.74 1.41 × 104
300 4.10 2.12 × 104
400 5.47 2.82 × 104
500 6.84 3.53 × 104
600 8.21 4.23 × 104
700 9.58 4.94 × 104
800 10.9 5.64 × 104
900 12.3 6.35 × 104
1000 13.7 7.05 × 104
1340 18.4 9.46 × 104
Steel I Beam: W18 × 65 (Wide Flange 18 inch tall × 65 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 1.42 5800
70.0 1.53 6250
80.0 1.75 7140
90.0 1.97 8030
100 2.19 8930
200 4.38 1.79 × 104
300 6.57 2.68 × 104
400 8.77 3.57 × 104
500 11.0 4.46 × 104
600 13.1 5.36 × 104
700 15.3 6.25 × 104
800 17.5 7.14 × 104
837 18.4 7.47 × 104
Steel I Beam: W18 × 65 (Wide Flange 18 inch tall × 65 lbf/ft)
L = 100 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 2.17 7160
70.0 2.34 7710
80.0 2.67 8820
90.0 3.01 9920
100 3.34 1.10 × 104
200 6.68 2.20 × 104
300 10.0 3.31 × 104
400 13.4 4.41 × 104
500 16.7 5.51 × 104
549 18.4 6.05 × 104
Steel I Beam: W18 × 65 (Wide Flange 18 inch tall × 65 lbf/ft)
L = 125 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 5.30 1.12 × 104
70.0 5.71 1.21 × 104
80.0 6.52 1.38 × 104
90.0 7.34 1.55 × 104
100 8.16 1.72 × 104
200 16.3 3.44 × 104
225 18.4 3.87 × 104
Steel I Beam: W18 × 65 (Wide Flange 18 inch tall × 65 lbf/ft)
L = 150 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 11.0 1.61 × 104
70.0 11.8 1.74 × 104
80.0 13.5 1.98 × 104
90.0 15.2 2.23 × 104
100 16.9 2.48 × 104
109 18.4 2.69 × 104
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