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Wide Flange Steel I Beam: W21 × 44
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Single Span » Wide Flange Steel I Beam » W21 × 44
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 = 843 in4) for the W21 × 44 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 × 44 (Wide Flange 21 inch tall × 44 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
44.0 3.12 × 10-6 7.28
50.0 3.55 × 10-6 8.27
60.0 4.26 × 10-6 9.93
70.0 4.97 × 10-6 11.6
80.0 5.68 × 10-6 13.2
90.0 6.39 × 10-6 14.9
100 7.10 × 10-6 16.5
200 1.42 × 10-5 33.1
300 2.13 × 10-5 49.6
400 2.84 × 10-5 66.2
500 3.55 × 10-5 82.7
600 4.26 × 10-5 99.3
700 4.97 × 10-5 116
800 5.68 × 10-5 132
900 6.39 × 10-5 149
1000 7.10 × 10-5 165
2000 1.42 × 10-4 331
3000 2.13 × 10-4 496
4000 2.84 × 10-4 662
5000 3.55 × 10-4 827
6000 4.26 × 10-4 993
7000 4.97 × 10-4 1160
8000 5.68 × 10-4 1320
9000 6.39 × 10-4 1490
1.00 × 104 7.10 × 10-4 1650
2.00 × 104 0.00142 3310
3.00 × 104 0.00213 4960
4.00 × 104 0.00284 6620
5.00 × 104 0.00355 8270
6.00 × 104 0.00426 9930
7.00 × 104 0.00497 1.16 × 104
8.00 × 104 0.00568 1.32 × 104
9.00 × 104 0.00639 1.49 × 104
1.00 × 105 0.00710 1.65 × 104
2.00 × 105 0.0142 3.31 × 104
3.00 × 105 0.0213 4.96 × 104
4.00 × 105 0.0284 6.62 × 104
5.00 × 105 0.0355 8.27 × 104
6.00 × 105 0.0426 9.93 × 104
7.00 × 105 0.0497 1.16 × 105
8.00 × 105 0.0568 1.32 × 105
9.00 × 105 0.0639 1.49 × 105
1.00 × 106 0.0710 1.65 × 105
1.80 × 106 0.127 2.97 × 105
Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
44.0 2.41 × 10-5 20.2
50.0 2.74 × 10-5 23.0
60.0 3.29 × 10-5 27.6
70.0 3.83 × 10-5 32.2
80.0 4.38 × 10-5 36.8
90.0 4.93 × 10-5 41.4
100 5.48 × 10-5 46.0
200 1.10 × 10-4 91.9
300 1.64 × 10-4 138
400 2.19 × 10-4 184
500 2.74 × 10-4 230
600 3.29 × 10-4 276
700 3.83 × 10-4 322
800 4.38 × 10-4 368
900 4.93 × 10-4 414
1000 5.48 × 10-4 460
2000 0.00110 919
3000 0.00164 1380
4000 0.00219 1840
5000 0.00274 2300
6000 0.00329 2760
7000 0.00383 3220
8000 0.00438 3680
9000 0.00493 4140
1.00 × 104 0.00548 4600
2.00 × 104 0.0110 9190
3.00 × 104 0.0164 1.38 × 104
4.00 × 104 0.0219 1.84 × 104
5.00 × 104 0.0274 2.30 × 104
6.00 × 104 0.0329 2.76 × 104
7.00 × 104 0.0383 3.22 × 104
8.00 × 104 0.0438 3.68 × 104
9.00 × 104 0.0493 4.14 × 104
1.00 × 105 0.0548 4.60 × 104
2.00 × 105 0.110 9.19 × 104
3.00 × 105 0.164 1.38 × 105
4.00 × 105 0.219 1.84 × 105
5.00 × 105 0.274 2.30 × 105
6.00 × 105 0.329 2.76 × 105
6.46 × 105 0.354 2.97 × 105
Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
44.0 3.86 × 10-4 80.9
50.0 4.38 × 10-4 91.9
60.0 5.26 × 10-4 110
70.0 6.13 × 10-4 129
80.0 7.01 × 10-4 147
90.0 7.89 × 10-4 165
100 8.76 × 10-4 184
200 0.00175 368
300 0.00263 551
400 0.00351 735
500 0.00438 919
600 0.00526 1100
700 0.00613 1290
800 0.00701 1470
900 0.00789 1650
1000 0.00876 1840
2000 0.0175 3680
3000 0.0263 5510
4000 0.0351 7350
5000 0.0438 9190
6000 0.0526 1.10 × 104
7000 0.0613 1.29 × 104
8000 0.0701 1.47 × 104
9000 0.0789 1.65 × 104
1.00 × 104 0.0876 1.84 × 104
2.00 × 104 0.175 3.68 × 104
3.00 × 104 0.263 5.51 × 104
4.00 × 104 0.351 7.35 × 104
5.00 × 104 0.438 9.19 × 104
6.00 × 104 0.526 1.10 × 105
7.00 × 104 0.613 1.29 × 105
8.00 × 104 0.701 1.47 × 105
9.00 × 104 0.789 1.65 × 105
1.00 × 105 0.876 1.84 × 105
1.62 × 105 1.42 2.97 × 105
Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
44.0 0.00195 182
50.0 0.00222 207
60.0 0.00266 248
70.0 0.00311 289
80.0 0.00355 331
90.0 0.00399 372
100 0.00444 414
200 0.00887 827
300 0.0133 1240
400 0.0177 1650
500 0.0222 2070
600 0.0266 2480
700 0.0311 2890
800 0.0355 3310
900 0.0399 3720
1000 0.0444 4140
2000 0.0887 8270
3000 0.133 1.24 × 104
4000 0.177 1.65 × 104
5000 0.222 2.07 × 104
6000 0.266 2.48 × 104
7000 0.311 2.89 × 104
8000 0.355 3.31 × 104
9000 0.399 3.72 × 104
1.00 × 104 0.444 4.14 × 104
2.00 × 104 0.887 8.27 × 104
3.00 × 104 1.33 1.24 × 105
4.00 × 104 1.77 1.65 × 105
5.00 × 104 2.22 2.07 × 105
6.00 × 104 2.66 2.48 × 105
7.00 × 104 3.11 2.89 × 105
7.18 × 104 3.19 2.97 × 105
Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
44.0 0.00617 324
50.0 0.00701 368
60.0 0.00841 441
70.0 0.00981 515
80.0 0.0112 588
90.0 0.0126 662
100 0.0140 735
200 0.0280 1470
300 0.0421 2210
400 0.0561 2940
500 0.0701 3680
600 0.0841 4410
700 0.0981 5150
800 0.112 5880
900 0.126 6620
1000 0.140 7350
2000 0.280 1.47 × 104
3000 0.421 2.21 × 104
4000 0.561 2.94 × 104
5000 0.701 3.68 × 104
6000 0.841 4.41 × 104
7000 0.981 5.15 × 104
8000 1.12 5.88 × 104
9000 1.26 6.62 × 104
1.00 × 104 1.40 7.35 × 104
2.00 × 104 2.80 1.47 × 105
3.00 × 104 4.21 2.21 × 105
4.00 × 104 5.61 2.94 × 105
4.04 × 104 5.66 2.97 × 105
Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
44.0 0.0151 505
50.0 0.0171 574
60.0 0.0205 689
70.0 0.0240 804
80.0 0.0274 919
90.0 0.0308 1030
100 0.0342 1150
200 0.0685 2300
300 0.103 3450
400 0.137 4600
500 0.171 5740
600 0.205 6890
700 0.240 8040
800 0.274 9190
900 0.308 1.03 × 104
1000 0.342 1.15 × 104
2000 0.685 2.30 × 104
3000 1.03 3.45 × 104
4000 1.37 4.60 × 104
5000 1.71 5.74 × 104
6000 2.05 6.89 × 104
7000 2.40 8.04 × 104
8000 2.74 9.19 × 104
9000 3.08 1.03 × 105
1.00 × 104 3.42 1.15 × 105
2.00 × 104 6.85 2.30 × 105
2.59 × 104 8.85 2.97 × 105
Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
44.0 0.0312 728
50.0 0.0355 827
60.0 0.0426 993
70.0 0.0497 1160
80.0 0.0568 1320
90.0 0.0639 1490
100 0.0710 1650
200 0.142 3310
300 0.213 4960
400 0.284 6620
500 0.355 8270
600 0.426 9930
700 0.497 1.16 × 104
800 0.568 1.32 × 104
900 0.639 1.49 × 104
1000 0.710 1.65 × 104
2000 1.42 3.31 × 104
3000 2.13 4.96 × 104
4000 2.84 6.62 × 104
5000 3.55 8.27 × 104
6000 4.26 9.93 × 104
7000 4.97 1.16 × 105
8000 5.68 1.32 × 105
9000 6.39 1.49 × 105
1.00 × 104 7.10 1.65 × 105
1.80 × 104 12.7 2.97 × 105
Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
44.0 0.0987 1290
50.0 0.112 1470
60.0 0.135 1760
70.0 0.157 2060
80.0 0.179 2350
90.0 0.202 2650
100 0.224 2940
200 0.449 5880
300 0.673 8820
400 0.897 1.18 × 104
500 1.12 1.47 × 104
600 1.35 1.76 × 104
700 1.57 2.06 × 104
800 1.79 2.35 × 104
900 2.02 2.65 × 104
1000 2.24 2.94 × 104
2000 4.49 5.88 × 104
3000 6.73 8.82 × 104
4000 8.97 1.18 × 105
5000 11.2 1.47 × 105
6000 13.5 1.76 × 105
7000 15.7 2.06 × 105
8000 17.9 2.35 × 105
9000 20.2 2.65 × 105
9210 20.7 2.71 × 105
Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
44.0 0.241 2020
50.0 0.274 2300
60.0 0.329 2760
70.0 0.383 3220
80.0 0.438 3680
90.0 0.493 4140
100 0.548 4600
200 1.10 9190
300 1.64 1.38 × 104
400 2.19 1.84 × 104
500 2.74 2.30 × 104
600 3.29 2.76 × 104
700 3.83 3.22 × 104
800 4.38 3.68 × 104
900 4.93 4.14 × 104
1000 5.48 4.60 × 104
2000 11.0 9.19 × 104
3000 16.4 1.38 × 105
3770 20.7 1.73 × 105
Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
44.0 0.500 2910
50.0 0.568 3310
60.0 0.681 3970
70.0 0.795 4630
80.0 0.909 5290
90.0 1.02 5960
100 1.14 6620
200 2.27 1.32 × 104
300 3.41 1.99 × 104
400 4.54 2.65 × 104
500 5.68 3.31 × 104
600 6.81 3.97 × 104
700 7.95 4.63 × 104
800 9.09 5.29 × 104
900 10.2 5.96 × 104
1000 11.4 6.62 × 104
1820 20.7 1.20 × 105
Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
44.0 0.926 3960
50.0 1.05 4500
60.0 1.26 5400
70.0 1.47 6300
80.0 1.68 7210
90.0 1.89 8110
100 2.10 9010
200 4.21 1.80 × 104
300 6.31 2.70 × 104
400 8.42 3.60 × 104
500 10.5 4.50 × 104
600 12.6 5.40 × 104
700 14.7 6.30 × 104
800 16.8 7.21 × 104
900 18.9 8.11 × 104
982 20.7 8.84 × 104
Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
44.0 1.58 5180
50.0 1.79 5880
60.0 2.15 7060
70.0 2.51 8230
80.0 2.87 9410
90.0 3.23 1.06 × 104
100 3.59 1.18 × 104
200 7.18 2.35 × 104
300 10.8 3.53 × 104
400 14.4 4.71 × 104
500 17.9 5.88 × 104
576 20.7 6.77 × 104
Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
44.0 2.53 6550
50.0 2.87 7440
60.0 3.45 8930
70.0 4.02 1.04 × 104
80.0 4.60 1.19 × 104
90.0 5.17 1.34 × 104
100 5.75 1.49 × 104
200 11.5 2.98 × 104
300 17.2 4.47 × 104
359 20.7 5.35 × 104
Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft)
L = 100 ft
P (lbf/ft) w_max (in) stress_max (psi)
44.0 3.86 8090
50.0 4.38 9190
60.0 5.26 1.10 × 104
70.0 6.13 1.29 × 104
80.0 7.01 1.47 × 104
90.0 7.89 1.65 × 104
100 8.76 1.84 × 104
200 17.5 3.68 × 104
236 20.7 4.33 × 104
Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft)
L = 125 ft
P (lbf/ft) w_max (in) stress_max (psi)
44.0 9.41 1.26 × 104
50.0 10.7 1.44 × 104
60.0 12.8 1.72 × 104
70.0 15.0 2.01 × 104
80.0 17.1 2.30 × 104
90.0 19.3 2.58 × 104
96.6 20.7 2.77 × 104
Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft)
L = 150 ft
P (lbf/ft) w_max (in) stress_max (psi)
44.0 19.5 1.82 × 104
46.6 20.7 1.93 × 104
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