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Wide Flange Steel I Beam: W12 × 65
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Two Equal Spans » Wide Flange Steel I Beam » W12 × 65
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 = 533 in4) for the W12 × 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
  
Steel I Beam: W12 × 65 (Wide Flange 12 inch tall × 65 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 2.92 × 10-6 9.98
70.0 3.14 × 10-6 10.7
80.0 3.59 × 10-6 12.3
90.0 4.04 × 10-6 13.8
100 4.49 × 10-6 15.3
200 8.98 × 10-6 30.7
300 1.35 × 10-5 46.0
400 1.80 × 10-5 61.4
500 2.25 × 10-5 76.7
600 2.69 × 10-5 92.1
700 3.14 × 10-5 107
800 3.59 × 10-5 123
900 4.04 × 10-5 138
1000 4.49 × 10-5 153
2000 8.98 × 10-5 307
3000 1.35 × 10-4 460
4000 1.80 × 10-4 614
5000 2.25 × 10-4 767
6000 2.69 × 10-4 921
7000 3.14 × 10-4 1070
8000 3.59 × 10-4 1230
9000 4.04 × 10-4 1380
1.00 × 104 4.49 × 10-4 1530
2.00 × 104 8.98 × 10-4 3070
3.00 × 104 0.00135 4600
4.00 × 104 0.00180 6140
5.00 × 104 0.00225 7670
6.00 × 104 0.00269 9210
7.00 × 104 0.00314 1.07 × 104
8.00 × 104 0.00359 1.23 × 104
9.00 × 104 0.00404 1.38 × 104
1.00 × 105 0.00449 1.53 × 104
2.00 × 105 0.00898 3.07 × 104
3.00 × 105 0.0135 4.60 × 104
4.00 × 105 0.0180 6.14 × 104
5.00 × 105 0.0225 7.67 × 104
6.00 × 105 0.0269 9.21 × 104
7.00 × 105 0.0314 1.07 × 105
8.00 × 105 0.0359 1.23 × 105
9.00 × 105 0.0404 1.38 × 105
1.00 × 106 0.0449 1.53 × 105
1.94 × 106 0.0869 2.97 × 105
Steel I Beam: W12 × 65 (Wide Flange 12 inch tall × 65 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 2.25 × 10-5 27.7
70.0 2.43 × 10-5 29.8
80.0 2.77 × 10-5 34.1
90.0 3.12 × 10-5 38.4
100 3.46 × 10-5 42.6
200 6.93 × 10-5 85.3
300 1.04 × 10-4 128
400 1.39 × 10-4 171
500 1.73 × 10-4 213
600 2.08 × 10-4 256
700 2.43 × 10-4 298
800 2.77 × 10-4 341
900 3.12 × 10-4 384
1000 3.46 × 10-4 426
2000 6.93 × 10-4 853
3000 0.00104 1280
4000 0.00139 1710
5000 0.00173 2130
6000 0.00208 2560
7000 0.00243 2980
8000 0.00277 3410
9000 0.00312 3840
1.00 × 104 0.00346 4260
2.00 × 104 0.00693 8530
3.00 × 104 0.0104 1.28 × 104
4.00 × 104 0.0139 1.71 × 104
5.00 × 104 0.0173 2.13 × 104
6.00 × 104 0.0208 2.56 × 104
7.00 × 104 0.0243 2.98 × 104
8.00 × 104 0.0277 3.41 × 104
9.00 × 104 0.0312 3.84 × 104
1.00 × 105 0.0346 4.26 × 104
2.00 × 105 0.0693 8.53 × 104
3.00 × 105 0.104 1.28 × 105
4.00 × 105 0.139 1.71 × 105
5.00 × 105 0.173 2.13 × 105
6.00 × 105 0.208 2.56 × 105
6.97 × 105 0.241 2.97 × 105
Steel I Beam: W12 × 65 (Wide Flange 12 inch tall × 65 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 3.60 × 10-4 111
70.0 3.88 × 10-4 119
80.0 4.44 × 10-4 136
90.0 4.99 × 10-4 153
100 5.54 × 10-4 171
200 0.00111 341
300 0.00166 512
400 0.00222 682
500 0.00277 853
600 0.00333 1020
700 0.00388 1190
800 0.00444 1360
900 0.00499 1530
1000 0.00554 1710
2000 0.0111 3410
3000 0.0166 5120
4000 0.0222 6820
5000 0.0277 8530
6000 0.0333 1.02 × 104
7000 0.0388 1.19 × 104
8000 0.0444 1.36 × 104
9000 0.0499 1.53 × 104
1.00 × 104 0.0554 1.71 × 104
2.00 × 104 0.111 3.41 × 104
3.00 × 104 0.166 5.12 × 104
4.00 × 104 0.222 6.82 × 104
5.00 × 104 0.277 8.53 × 104
6.00 × 104 0.333 1.02 × 105
7.00 × 104 0.388 1.19 × 105
8.00 × 104 0.444 1.36 × 105
9.00 × 104 0.499 1.53 × 105
1.00 × 105 0.554 1.71 × 105
1.74 × 105 0.966 2.97 × 105
Steel I Beam: W12 × 65 (Wide Flange 12 inch tall × 65 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 0.00182 249
70.0 0.00196 269
80.0 0.00225 307
90.0 0.00253 345
100 0.00281 384
200 0.00561 767
300 0.00842 1150
400 0.0112 1530
500 0.0140 1920
600 0.0168 2300
700 0.0196 2690
800 0.0225 3070
900 0.0253 3450
1000 0.0281 3840
2000 0.0561 7670
3000 0.0842 1.15 × 104
4000 0.112 1.53 × 104
5000 0.140 1.92 × 104
6000 0.168 2.30 × 104
7000 0.196 2.69 × 104
8000 0.225 3.07 × 104
9000 0.253 3.45 × 104
1.00 × 104 0.281 3.84 × 104
2.00 × 104 0.561 7.67 × 104
3.00 × 104 0.842 1.15 × 105
4.00 × 104 1.12 1.53 × 105
5.00 × 104 1.40 1.92 × 105
6.00 × 104 1.68 2.30 × 105
7.00 × 104 1.96 2.69 × 105
7.74 × 104 2.17 2.97 × 105
Steel I Beam: W12 × 65 (Wide Flange 12 inch tall × 65 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 0.00577 443
70.0 0.00621 478
80.0 0.00710 546
90.0 0.00798 614
100 0.00887 682
200 0.0177 1360
300 0.0266 2050
400 0.0355 2730
500 0.0444 3410
600 0.0532 4090
700 0.0621 4780
800 0.0710 5460
900 0.0798 6140
1000 0.0887 6820
2000 0.177 1.36 × 104
3000 0.266 2.05 × 104
4000 0.355 2.73 × 104
5000 0.444 3.41 × 104
6000 0.532 4.09 × 104
7000 0.621 4.78 × 104
8000 0.710 5.46 × 104
9000 0.798 6.14 × 104
1.00 × 104 0.887 6.82 × 104
2.00 × 104 1.77 1.36 × 105
3.00 × 104 2.66 2.05 × 105
4.00 × 104 3.55 2.73 × 105
4.35 × 104 3.86 2.97 × 105
Steel I Beam: W12 × 65 (Wide Flange 12 inch tall × 65 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 0.0141 693
70.0 0.0152 746
80.0 0.0173 853
90.0 0.0195 959
100 0.0217 1070
200 0.0433 2130
300 0.0650 3200
400 0.0866 4260
500 0.108 5330
600 0.130 6400
700 0.152 7460
800 0.173 8530
900 0.195 9590
1000 0.217 1.07 × 104
2000 0.433 2.13 × 104
3000 0.650 3.20 × 104
4000 0.866 4.26 × 104
5000 1.08 5.33 × 104
6000 1.30 6.40 × 104
7000 1.52 7.46 × 104
8000 1.73 8.53 × 104
9000 1.95 9.59 × 104
1.00 × 104 2.17 1.07 × 105
2.00 × 104 4.33 2.13 × 105
2.79 × 104 6.03 2.97 × 105
Steel I Beam: W12 × 65 (Wide Flange 12 inch tall × 65 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 0.0292 998
70.0 0.0314 1070
80.0 0.0359 1230
90.0 0.0404 1380
100 0.0449 1530
200 0.0898 3070
300 0.135 4600
400 0.180 6140
500 0.225 7670
600 0.269 9210
700 0.314 1.07 × 104
800 0.359 1.23 × 104
900 0.404 1.38 × 104
1000 0.449 1.53 × 104
2000 0.898 3.07 × 104
3000 1.35 4.60 × 104
4000 1.80 6.14 × 104
5000 2.25 7.67 × 104
6000 2.69 9.21 × 104
7000 3.14 1.07 × 105
8000 3.59 1.23 × 105
9000 4.04 1.38 × 105
1.00 × 104 4.49 1.53 × 105
1.94 × 104 8.69 2.97 × 105
Steel I Beam: W12 × 65 (Wide Flange 12 inch tall × 65 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 0.0923 1770
70.0 0.0993 1910
80.0 0.114 2180
90.0 0.128 2460
100 0.142 2730
200 0.284 5460
300 0.426 8190
400 0.568 1.09 × 104
500 0.710 1.36 × 104
600 0.852 1.64 × 104
700 0.993 1.91 × 104
800 1.14 2.18 × 104
900 1.28 2.46 × 104
1000 1.42 2.73 × 104
2000 2.84 5.46 × 104
3000 4.26 8.19 × 104
4000 5.68 1.09 × 105
5000 7.10 1.36 × 105
6000 8.52 1.64 × 105
7000 9.93 1.91 × 105
8000 11.4 2.18 × 105
8540 12.1 2.33 × 105
Steel I Beam: W12 × 65 (Wide Flange 12 inch tall × 65 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 0.225 2770
70.0 0.243 2980
80.0 0.277 3410
90.0 0.312 3840
100 0.346 4260
200 0.693 8530
300 1.04 1.28 × 104
400 1.39 1.71 × 104
500 1.73 2.13 × 104
600 2.08 2.56 × 104
700 2.43 2.98 × 104
800 2.77 3.41 × 104
900 3.12 3.84 × 104
1000 3.46 4.26 × 104
2000 6.93 8.53 × 104
3000 10.4 1.28 × 105
3500 12.1 1.49 × 105
Steel I Beam: W12 × 65 (Wide Flange 12 inch tall × 65 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 0.467 3990
70.0 0.503 4300
80.0 0.575 4910
90.0 0.647 5530
100 0.718 6140
200 1.44 1.23 × 104
300 2.16 1.84 × 104
400 2.87 2.46 × 104
500 3.59 3.07 × 104
600 4.31 3.68 × 104
700 5.03 4.30 × 104
800 5.75 4.91 × 104
900 6.47 5.53 × 104
1000 7.18 6.14 × 104
1690 12.1 1.04 × 105
Steel I Beam: W12 × 65 (Wide Flange 12 inch tall × 65 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 0.865 5430
70.0 0.932 5850
80.0 1.06 6690
90.0 1.20 7520
100 1.33 8360
200 2.66 1.67 × 104
300 3.99 2.51 × 104
400 5.32 3.34 × 104
500 6.66 4.18 × 104
600 7.99 5.01 × 104
700 9.32 5.85 × 104
800 10.6 6.69 × 104
900 12.0 7.52 × 104
911 12.1 7.61 × 104
Steel I Beam: W12 × 65 (Wide Flange 12 inch tall × 65 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 1.48 7090
70.0 1.59 7640
80.0 1.82 8730
90.0 2.04 9820
100 2.27 1.09 × 104
200 4.54 2.18 × 104
300 6.81 3.27 × 104
400 9.08 4.37 × 104
500 11.4 5.46 × 104
534 12.1 5.83 × 104
Steel I Beam: W12 × 65 (Wide Flange 12 inch tall × 65 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 2.36 8980
70.0 2.55 9670
80.0 2.91 1.11 × 104
90.0 3.27 1.24 × 104
100 3.64 1.38 × 104
200 7.27 2.76 × 104
300 10.9 4.14 × 104
333 12.1 4.60 × 104
Steel I Beam: W12 × 65 (Wide Flange 12 inch tall × 65 lbf/ft)
L = 100 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 3.60 1.11 × 104
70.0 3.88 1.19 × 104
80.0 4.44 1.36 × 104
90.0 4.99 1.53 × 104
100 5.54 1.71 × 104
200 11.1 3.41 × 104
219 12.1 3.73 × 104
Steel I Beam: W12 × 65 (Wide Flange 12 inch tall × 65 lbf/ft)
L = 125 ft
P (lbf/ft) w_max (in) stress_max (psi)
65.0 8.80 1.73 × 104
70.0 9.47 1.87 × 104
80.0 10.8 2.13 × 104
89.5 12.1 2.39 × 104
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