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Wide Flange Steel I Beam: W12 × 79
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Single Span » Wide Flange Steel I Beam » W12 × 79
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 = 662 in4) for the W12 × 79 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 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 7.14 × 10-6 9.97
80.0 7.23 × 10-6 10.1
90.0 8.13 × 10-6 11.4
100 9.04 × 10-6 12.6
200 1.81 × 10-5 25.2
300 2.71 × 10-5 37.9
400 3.62 × 10-5 50.5
500 4.52 × 10-5 63.1
600 5.42 × 10-5 75.7
700 6.33 × 10-5 88.4
800 7.23 × 10-5 101
900 8.13 × 10-5 114
1000 9.04 × 10-5 126
2000 1.81 × 10-4 252
3000 2.71 × 10-4 379
4000 3.62 × 10-4 505
5000 4.52 × 10-4 631
6000 5.42 × 10-4 757
7000 6.33 × 10-4 884
8000 7.23 × 10-4 1010
9000 8.13 × 10-4 1140
1.00 × 104 9.04 × 10-4 1260
2.00 × 104 0.00181 2520
3.00 × 104 0.00271 3790
4.00 × 104 0.00362 5050
5.00 × 104 0.00452 6310
6.00 × 104 0.00542 7570
7.00 × 104 0.00633 8840
8.00 × 104 0.00723 1.01 × 104
9.00 × 104 0.00813 1.14 × 104
1.00 × 105 0.00904 1.26 × 104
2.00 × 105 0.0181 2.52 × 104
3.00 × 105 0.0271 3.79 × 104
4.00 × 105 0.0362 5.05 × 104
5.00 × 105 0.0452 6.31 × 104
6.00 × 105 0.0542 7.57 × 104
7.00 × 105 0.0633 8.84 × 104
8.00 × 105 0.0723 1.01 × 105
9.00 × 105 0.0813 1.14 × 105
1.00 × 106 0.0904 1.26 × 105
2.00 × 106 0.181 2.52 × 105
2.35 × 106 0.213 2.97 × 105
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 5.51 × 10-5 27.7
80.0 5.58 × 10-5 28.1
90.0 6.28 × 10-5 31.6
100 6.97 × 10-5 35.1
200 1.39 × 10-4 70.1
300 2.09 × 10-4 105
400 2.79 × 10-4 140
500 3.49 × 10-4 175
600 4.18 × 10-4 210
700 4.88 × 10-4 245
800 5.58 × 10-4 281
900 6.28 × 10-4 316
1000 6.97 × 10-4 351
2000 0.00139 701
3000 0.00209 1050
4000 0.00279 1400
5000 0.00349 1750
6000 0.00418 2100
7000 0.00488 2450
8000 0.00558 2810
9000 0.00628 3160
1.00 × 104 0.00697 3510
2.00 × 104 0.0139 7010
3.00 × 104 0.0209 1.05 × 104
4.00 × 104 0.0279 1.40 × 104
5.00 × 104 0.0349 1.75 × 104
6.00 × 104 0.0418 2.10 × 104
7.00 × 104 0.0488 2.45 × 104
8.00 × 104 0.0558 2.81 × 104
9.00 × 104 0.0628 3.16 × 104
1.00 × 105 0.0697 3.51 × 104
2.00 × 105 0.139 7.01 × 104
3.00 × 105 0.209 1.05 × 105
4.00 × 105 0.279 1.40 × 105
5.00 × 105 0.349 1.75 × 105
6.00 × 105 0.418 2.10 × 105
7.00 × 105 0.488 2.45 × 105
8.00 × 105 0.558 2.81 × 105
8.47 × 105 0.591 2.97 × 105
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 8.82 × 10-4 111
80.0 8.93 × 10-4 112
90.0 0.00100 126
100 0.00112 140
200 0.00223 281
300 0.00335 421
400 0.00446 561
500 0.00558 701
600 0.00670 842
700 0.00781 982
800 0.00893 1120
900 0.0100 1260
1000 0.0112 1400
2000 0.0223 2810
3000 0.0335 4210
4000 0.0446 5610
5000 0.0558 7010
6000 0.0670 8420
7000 0.0781 9820
8000 0.0893 1.12 × 104
9000 0.100 1.26 × 104
1.00 × 104 0.112 1.40 × 104
2.00 × 104 0.223 2.81 × 104
3.00 × 104 0.335 4.21 × 104
4.00 × 104 0.446 5.61 × 104
5.00 × 104 0.558 7.01 × 104
6.00 × 104 0.670 8.42 × 104
7.00 × 104 0.781 9.82 × 104
8.00 × 104 0.893 1.12 × 105
9.00 × 104 1.00 1.26 × 105
1.00 × 105 1.12 1.40 × 105
2.00 × 105 2.23 2.81 × 105
2.12 × 105 2.36 2.97 × 105
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 0.00446 249
80.0 0.00452 252
90.0 0.00508 284
100 0.00565 316
200 0.0113 631
300 0.0169 947
400 0.0226 1260
500 0.0282 1580
600 0.0339 1890
700 0.0395 2210
800 0.0452 2520
900 0.0508 2840
1000 0.0565 3160
2000 0.113 6310
3000 0.169 9470
4000 0.226 1.26 × 104
5000 0.282 1.58 × 104
6000 0.339 1.89 × 104
7000 0.395 2.21 × 104
8000 0.452 2.52 × 104
9000 0.508 2.84 × 104
1.00 × 104 0.565 3.16 × 104
2.00 × 104 1.13 6.31 × 104
3.00 × 104 1.69 9.47 × 104
4.00 × 104 2.26 1.26 × 105
5.00 × 104 2.82 1.58 × 105
6.00 × 104 3.39 1.89 × 105
7.00 × 104 3.95 2.21 × 105
8.00 × 104 4.52 2.52 × 105
9.00 × 104 5.08 2.84 × 105
9.41 × 104 5.32 2.97 × 105
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 0.0141 443
80.0 0.0143 449
90.0 0.0161 505
100 0.0179 561
200 0.0357 1120
300 0.0536 1680
400 0.0714 2240
500 0.0893 2810
600 0.107 3370
700 0.125 3930
800 0.143 4490
900 0.161 5050
1000 0.179 5610
2000 0.357 1.12 × 104
3000 0.536 1.68 × 104
4000 0.714 2.24 × 104
5000 0.893 2.81 × 104
6000 1.07 3.37 × 104
7000 1.25 3.93 × 104
8000 1.43 4.49 × 104
9000 1.61 5.05 × 104
1.00 × 104 1.79 5.61 × 104
2.00 × 104 3.57 1.12 × 105
3.00 × 104 5.36 1.68 × 105
4.00 × 104 7.14 2.24 × 105
5.00 × 104 8.93 2.81 × 105
5.29 × 104 9.45 2.97 × 105
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 0.0344 693
80.0 0.0349 701
90.0 0.0392 789
100 0.0436 877
200 0.0872 1750
300 0.131 2630
400 0.174 3510
500 0.218 4380
600 0.262 5260
700 0.305 6140
800 0.349 7010
900 0.392 7890
1000 0.436 8770
2000 0.872 1.75 × 104
3000 1.31 2.63 × 104
4000 1.74 3.51 × 104
5000 2.18 4.38 × 104
6000 2.62 5.26 × 104
7000 3.05 6.14 × 104
8000 3.49 7.01 × 104
9000 3.92 7.89 × 104
1.00 × 104 4.36 8.77 × 104
2.00 × 104 8.72 1.75 × 105
2.84 × 104 12.4 2.49 × 105
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 0.0714 997
80.0 0.0723 1010
90.0 0.0813 1140
100 0.0904 1260
200 0.181 2520
300 0.271 3790
400 0.362 5050
500 0.452 6310
600 0.542 7570
700 0.633 8840
800 0.723 1.01 × 104
900 0.813 1.14 × 104
1000 0.904 1.26 × 104
2000 1.81 2.52 × 104
3000 2.71 3.79 × 104
4000 3.62 5.05 × 104
5000 4.52 6.31 × 104
6000 5.42 7.57 × 104
7000 6.33 8.84 × 104
8000 7.23 1.01 × 105
9000 8.13 1.14 × 105
1.00 × 104 9.04 1.26 × 105
1.37 × 104 12.4 1.73 × 105
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 0.226 1770
80.0 0.229 1800
90.0 0.257 2020
100 0.286 2240
200 0.571 4490
300 0.857 6730
400 1.14 8980
500 1.43 1.12 × 104
600 1.71 1.35 × 104
700 2.00 1.57 × 104
800 2.29 1.80 × 104
900 2.57 2.02 × 104
1000 2.86 2.24 × 104
2000 5.71 4.49 × 104
3000 8.57 6.73 × 104
4000 11.4 8.98 × 104
4330 12.4 9.73 × 104
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 0.551 2770
80.0 0.558 2810
90.0 0.628 3160
100 0.697 3510
200 1.39 7010
300 2.09 1.05 × 104
400 2.79 1.40 × 104
500 3.49 1.75 × 104
600 4.18 2.10 × 104
700 4.88 2.45 × 104
800 5.58 2.81 × 104
900 6.28 3.16 × 104
1000 6.97 3.51 × 104
1780 12.4 6.22 × 104
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 1.14 3990
80.0 1.16 4040
90.0 1.30 4540
100 1.45 5050
200 2.89 1.01 × 104
300 4.34 1.51 × 104
400 5.78 2.02 × 104
500 7.23 2.52 × 104
600 8.68 3.03 × 104
700 10.1 3.53 × 104
800 11.6 4.04 × 104
856 12.4 4.32 × 104
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 2.12 5430
80.0 2.14 5500
90.0 2.41 6190
100 2.68 6870
200 5.36 1.37 × 104
300 8.04 2.06 × 104
400 10.7 2.75 × 104
462 12.4 3.18 × 104
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 3.61 7090
80.0 3.66 7180
90.0 4.11 8080
100 4.57 8980
200 9.14 1.80 × 104
271 12.4 2.43 × 104
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 5.78 8980
80.0 5.86 9090
90.0 6.59 1.02 × 104
100 7.32 1.14 × 104
169 12.4 1.92 × 104
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 100 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 8.82 1.11 × 104
80.0 8.93 1.12 × 104
90.0 10.0 1.26 × 104
100 11.2 1.40 × 104
111 12.4 1.56 × 104
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