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Wide Flange Steel I Beam: W21 × 73
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Single Span » Wide Flange Steel I Beam » W21 × 73
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 = 1600 in4) for the W21 × 73 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: W21 × 73 (Wide Flange 21 inch tall × 73 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
73.0 2.73 × 10-6 6.54
80.0 2.99 × 10-6 7.17
90.0 3.37 × 10-6 8.06
100 3.74 × 10-6 8.96
200 7.48 × 10-6 17.9
300 1.12 × 10-5 26.9
400 1.50 × 10-5 35.8
500 1.87 × 10-5 44.8
600 2.24 × 10-5 53.8
700 2.62 × 10-5 62.7
800 2.99 × 10-5 71.7
900 3.37 × 10-5 80.6
1000 3.74 × 10-5 89.6
2000 7.48 × 10-5 179
3000 1.12 × 10-4 269
4000 1.50 × 10-4 358
5000 1.87 × 10-4 448
6000 2.24 × 10-4 538
7000 2.62 × 10-4 627
8000 2.99 × 10-4 717
9000 3.37 × 10-4 806
1.00 × 104 3.74 × 10-4 896
2.00 × 104 7.48 × 10-4 1790
3.00 × 104 0.00112 2690
4.00 × 104 0.00150 3580
5.00 × 104 0.00187 4480
6.00 × 104 0.00224 5380
7.00 × 104 0.00262 6270
8.00 × 104 0.00299 7170
9.00 × 104 0.00337 8060
1.00 × 105 0.00374 8960
2.00 × 105 0.00748 1.79 × 104
3.00 × 105 0.0112 2.69 × 104
4.00 × 105 0.0150 3.58 × 104
5.00 × 105 0.0187 4.48 × 104
6.00 × 105 0.0224 5.38 × 104
7.00 × 105 0.0262 6.27 × 104
8.00 × 105 0.0299 7.17 × 104
9.00 × 105 0.0337 8.06 × 104
1.00 × 106 0.0374 8.96 × 104
2.00 × 106 0.0748 1.79 × 105
3.00 × 106 0.112 2.69 × 105
3.31 × 106 0.124 2.97 × 105
Steel I Beam: W21 × 73 (Wide Flange 21 inch tall × 73 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
73.0 2.11 × 10-5 18.2
80.0 2.31 × 10-5 19.9
90.0 2.60 × 10-5 22.4
100 2.89 × 10-5 24.9
200 5.77 × 10-5 49.8
300 8.66 × 10-5 74.7
400 1.15 × 10-4 99.6
500 1.44 × 10-4 124
600 1.73 × 10-4 149
700 2.02 × 10-4 174
800 2.31 × 10-4 199
900 2.60 × 10-4 224
1000 2.89 × 10-4 249
2000 5.77 × 10-4 498
3000 8.66 × 10-4 747
4000 0.00115 996
5000 0.00144 1240
6000 0.00173 1490
7000 0.00202 1740
8000 0.00231 1990
9000 0.00260 2240
1.00 × 104 0.00289 2490
2.00 × 104 0.00577 4980
3.00 × 104 0.00866 7470
4.00 × 104 0.0115 9960
5.00 × 104 0.0144 1.24 × 104
6.00 × 104 0.0173 1.49 × 104
7.00 × 104 0.0202 1.74 × 104
8.00 × 104 0.0231 1.99 × 104
9.00 × 104 0.0260 2.24 × 104
1.00 × 105 0.0289 2.49 × 104
2.00 × 105 0.0577 4.98 × 104
3.00 × 105 0.0866 7.47 × 104
4.00 × 105 0.115 9.96 × 104
5.00 × 105 0.144 1.24 × 105
6.00 × 105 0.173 1.49 × 105
7.00 × 105 0.202 1.74 × 105
8.00 × 105 0.231 1.99 × 105
9.00 × 105 0.260 2.24 × 105
1.00 × 106 0.289 2.49 × 105
1.19 × 106 0.344 2.97 × 105
Steel I Beam: W21 × 73 (Wide Flange 21 inch tall × 73 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
73.0 3.37 × 10-4 72.7
80.0 3.69 × 10-4 79.6
90.0 4.16 × 10-4 89.6
100 4.62 × 10-4 99.6
200 9.23 × 10-4 199
300 0.00139 299
400 0.00185 398
500 0.00231 498
600 0.00277 597
700 0.00323 697
800 0.00369 797
900 0.00416 896
1000 0.00462 996
2000 0.00923 1990
3000 0.0139 2990
4000 0.0185 3980
5000 0.0231 4980
6000 0.0277 5970
7000 0.0323 6970
8000 0.0369 7960
9000 0.0416 8960
1.00 × 104 0.0462 9960
2.00 × 104 0.0923 1.99 × 104
3.00 × 104 0.139 2.99 × 104
4.00 × 104 0.185 3.98 × 104
5.00 × 104 0.231 4.98 × 104
6.00 × 104 0.277 5.97 × 104
7.00 × 104 0.323 6.97 × 104
8.00 × 104 0.369 7.96 × 104
9.00 × 104 0.416 8.96 × 104
1.00 × 105 0.462 9.96 × 104
2.00 × 105 0.923 1.99 × 105
2.98 × 105 1.38 2.97 × 105
Steel I Beam: W21 × 73 (Wide Flange 21 inch tall × 73 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
73.0 0.00171 164
80.0 0.00187 179
90.0 0.00210 202
100 0.00234 224
200 0.00467 448
300 0.00701 672
400 0.00935 896
500 0.0117 1120
600 0.0140 1340
700 0.0164 1570
800 0.0187 1790
900 0.0210 2020
1000 0.0234 2240
2000 0.0467 4480
3000 0.0701 6720
4000 0.0935 8960
5000 0.117 1.12 × 104
6000 0.140 1.34 × 104
7000 0.164 1.57 × 104
8000 0.187 1.79 × 104
9000 0.210 2.02 × 104
1.00 × 104 0.234 2.24 × 104
2.00 × 104 0.467 4.48 × 104
3.00 × 104 0.701 6.72 × 104
4.00 × 104 0.935 8.96 × 104
5.00 × 104 1.17 1.12 × 105
6.00 × 104 1.40 1.34 × 105
7.00 × 104 1.64 1.57 × 105
8.00 × 104 1.87 1.79 × 105
9.00 × 104 2.10 2.02 × 105
1.00 × 105 2.34 2.24 × 105
1.33 × 105 3.10 2.97 × 105
Steel I Beam: W21 × 73 (Wide Flange 21 inch tall × 73 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
73.0 0.00539 291
80.0 0.00591 319
90.0 0.00665 358
100 0.00739 398
200 0.0148 797
300 0.0222 1190
400 0.0295 1590
500 0.0369 1990
600 0.0443 2390
700 0.0517 2790
800 0.0591 3190
900 0.0665 3580
1000 0.0739 3980
2000 0.148 7960
3000 0.222 1.19 × 104
4000 0.295 1.59 × 104
5000 0.369 1.99 × 104
6000 0.443 2.39 × 104
7000 0.517 2.79 × 104
8000 0.591 3.19 × 104
9000 0.665 3.58 × 104
1.00 × 104 0.739 3.98 × 104
2.00 × 104 1.48 7.96 × 104
3.00 × 104 2.22 1.19 × 105
4.00 × 104 2.95 1.59 × 105
5.00 × 104 3.69 1.99 × 105
6.00 × 104 4.43 2.39 × 105
7.00 × 104 5.17 2.79 × 105
7.46 × 104 5.51 2.97 × 105
Steel I Beam: W21 × 73 (Wide Flange 21 inch tall × 73 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
73.0 0.0132 454
80.0 0.0144 498
90.0 0.0162 560
100 0.0180 622
200 0.0361 1240
300 0.0541 1870
400 0.0721 2490
500 0.0902 3110
600 0.108 3730
700 0.126 4360
800 0.144 4980
900 0.162 5600
1000 0.180 6220
2000 0.361 1.24 × 104
3000 0.541 1.87 × 104
4000 0.721 2.49 × 104
5000 0.902 3.11 × 104
6000 1.08 3.73 × 104
7000 1.26 4.36 × 104
8000 1.44 4.98 × 104
9000 1.62 5.60 × 104
1.00 × 104 1.80 6.22 × 104
2.00 × 104 3.61 1.24 × 105
3.00 × 104 5.41 1.87 × 105
4.00 × 104 7.21 2.49 × 105
4.77 × 104 8.61 2.97 × 105
Steel I Beam: W21 × 73 (Wide Flange 21 inch tall × 73 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
73.0 0.0273 654
80.0 0.0299 717
90.0 0.0337 806
100 0.0374 896
200 0.0748 1790
300 0.112 2690
400 0.150 3580
500 0.187 4480
600 0.224 5380
700 0.262 6270
800 0.299 7170
900 0.337 8060
1000 0.374 8960
2000 0.748 1.79 × 104
3000 1.12 2.69 × 104
4000 1.50 3.58 × 104
5000 1.87 4.48 × 104
6000 2.24 5.38 × 104
7000 2.62 6.27 × 104
8000 2.99 7.17 × 104
9000 3.37 8.06 × 104
1.00 × 104 3.74 8.96 × 104
2.00 × 104 7.48 1.79 × 105
3.00 × 104 11.2 2.69 × 105
3.31 × 104 12.4 2.97 × 105
Steel I Beam: W21 × 73 (Wide Flange 21 inch tall × 73 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
73.0 0.0863 1160
80.0 0.0946 1270
90.0 0.106 1430
100 0.118 1590
200 0.236 3190
300 0.355 4780
400 0.473 6370
500 0.591 7960
600 0.709 9560
700 0.827 1.12 × 104
800 0.946 1.27 × 104
900 1.06 1.43 × 104
1000 1.18 1.59 × 104
2000 2.36 3.19 × 104
3000 3.55 4.78 × 104
4000 4.73 6.37 × 104
5000 5.91 7.96 × 104
6000 7.09 9.56 × 104
7000 8.27 1.12 × 105
8000 9.46 1.27 × 105
9000 10.6 1.43 × 105
1.00 × 104 11.8 1.59 × 105
1.86 × 104 22.0 2.97 × 105
Steel I Beam: W21 × 73 (Wide Flange 21 inch tall × 73 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
73.0 0.211 1820
80.0 0.231 1990
90.0 0.260 2240
100 0.289 2490
200 0.577 4980
300 0.866 7470
400 1.15 9960
500 1.44 1.24 × 104
600 1.73 1.49 × 104
700 2.02 1.74 × 104
800 2.31 1.99 × 104
900 2.60 2.24 × 104
1000 2.89 2.49 × 104
2000 5.77 4.98 × 104
3000 8.66 7.47 × 104
4000 11.5 9.96 × 104
5000 14.4 1.24 × 105
6000 17.3 1.49 × 105
7000 20.2 1.74 × 105
7360 21.2 1.83 × 105
Steel I Beam: W21 × 73 (Wide Flange 21 inch tall × 73 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
73.0 0.437 2620
80.0 0.479 2870
90.0 0.539 3230
100 0.598 3580
200 1.20 7170
300 1.80 1.08 × 104
400 2.39 1.43 × 104
500 2.99 1.79 × 104
600 3.59 2.15 × 104
700 4.19 2.51 × 104
800 4.79 2.87 × 104
900 5.39 3.23 × 104
1000 5.98 3.58 × 104
2000 12.0 7.17 × 104
3000 18.0 1.08 × 105
3550 21.2 1.27 × 105
Steel I Beam: W21 × 73 (Wide Flange 21 inch tall × 73 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
73.0 0.809 3560
80.0 0.887 3900
90.0 0.998 4390
100 1.11 4880
200 2.22 9760
300 3.33 1.46 × 104
400 4.43 1.95 × 104
500 5.54 2.44 × 104
600 6.65 2.93 × 104
700 7.76 3.41 × 104
800 8.87 3.90 × 104
900 9.98 4.39 × 104
1000 11.1 4.88 × 104
1920 21.2 9.35 × 104
Steel I Beam: W21 × 73 (Wide Flange 21 inch tall × 73 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
73.0 1.38 4650
80.0 1.51 5100
90.0 1.70 5730
100 1.89 6370
200 3.78 1.27 × 104
300 5.67 1.91 × 104
400 7.56 2.55 × 104
500 9.46 3.19 × 104
600 11.3 3.82 × 104
700 13.2 4.46 × 104
800 15.1 5.10 × 104
900 17.0 5.73 × 104
1000 18.9 6.37 × 104
1120 21.2 7.16 × 104
Steel I Beam: W21 × 73 (Wide Flange 21 inch tall × 73 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
73.0 2.21 5890
80.0 2.42 6450
90.0 2.73 7260
100 3.03 8060
200 6.06 1.61 × 104
300 9.09 2.42 × 104
400 12.1 3.23 × 104
500 15.1 4.03 × 104
600 18.2 4.84 × 104
700 21.2 5.65 × 104
701 21.2 5.65 × 104
Steel I Beam: W21 × 73 (Wide Flange 21 inch tall × 73 lbf/ft)
L = 100 ft
P (lbf/ft) w_max (in) stress_max (psi)
73.0 3.37 7270
80.0 3.69 7960
90.0 4.16 8960
100 4.62 9960
200 9.23 1.99 × 104
300 13.9 2.99 × 104
400 18.5 3.98 × 104
460 21.2 4.58 × 104
Steel I Beam: W21 × 73 (Wide Flange 21 inch tall × 73 lbf/ft)
L = 125 ft
P (lbf/ft) w_max (in) stress_max (psi)
73.0 8.23 1.14 × 104
80.0 9.02 1.24 × 104
90.0 10.1 1.40 × 104
100 11.3 1.56 × 104
188 21.2 2.93 × 104
Steel I Beam: W21 × 73 (Wide Flange 21 inch tall × 73 lbf/ft)
L = 150 ft
P (lbf/ft) w_max (in) stress_max (psi)
73.0 17.1 1.64 × 104
80.0 18.7 1.79 × 104
90.0 21.0 2.02 × 104
90.9 21.2 2.04 × 104
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