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Wide Flange Steel I Beam: W6 × 20
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Single Span » Wide Flange Steel I Beam » W6 × 20
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 = 41.4 in4) for the W6 × 20 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
  
Steel I Beam: W6 × 20 (Wide Flange 6 inch tall × 20 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
20.0 2.89 × 10-5 20.2
30.0 4.34 × 10-5 30.3
40.0 5.78 × 10-5 40.4
50.0 7.23 × 10-5 50.5
60.0 8.67 × 10-5 60.7
70.0 1.01 × 10-4 70.8
80.0 1.16 × 10-4 80.9
90.0 1.30 × 10-4 91.0
100 1.45 × 10-4 101
200 2.89 × 10-4 202
300 4.34 × 10-4 303
400 5.78 × 10-4 404
500 7.23 × 10-4 505
600 8.67 × 10-4 607
700 0.00101 708
800 0.00116 809
900 0.00130 910
1000 0.00145 1010
2000 0.00289 2020
3000 0.00434 3030
4000 0.00578 4040
5000 0.00723 5050
6000 0.00867 6070
7000 0.0101 7080
8000 0.0116 8090
9000 0.0130 9100
1.00 × 104 0.0145 1.01 × 104
2.00 × 104 0.0289 2.02 × 104
3.00 × 104 0.0434 3.03 × 104
4.00 × 104 0.0578 4.04 × 104
5.00 × 104 0.0723 5.05 × 104
6.00 × 104 0.0867 6.07 × 104
7.00 × 104 0.101 7.08 × 104
8.00 × 104 0.116 8.09 × 104
9.00 × 104 0.130 9.10 × 104
1.00 × 105 0.145 1.01 × 105
2.00 × 105 0.289 2.02 × 105
2.94 × 105 0.425 2.97 × 105
Steel I Beam: W6 × 20 (Wide Flange 6 inch tall × 20 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
20.0 2.23 × 10-4 56.2
30.0 3.35 × 10-4 84.2
40.0 4.46 × 10-4 112
50.0 5.58 × 10-4 140
60.0 6.69 × 10-4 168
70.0 7.81 × 10-4 197
80.0 8.92 × 10-4 225
90.0 0.00100 253
100 0.00112 281
200 0.00223 562
300 0.00335 842
400 0.00446 1120
500 0.00558 1400
600 0.00669 1680
700 0.00781 1970
800 0.00892 2250
900 0.0100 2530
1000 0.0112 2810
2000 0.0223 5620
3000 0.0335 8420
4000 0.0446 1.12 × 104
5000 0.0558 1.40 × 104
6000 0.0669 1.68 × 104
7000 0.0781 1.97 × 104
8000 0.0892 2.25 × 104
9000 0.100 2.53 × 104
1.00 × 104 0.112 2.81 × 104
2.00 × 104 0.223 5.62 × 104
3.00 × 104 0.335 8.42 × 104
4.00 × 104 0.446 1.12 × 105
5.00 × 104 0.558 1.40 × 105
6.00 × 104 0.669 1.68 × 105
7.00 × 104 0.781 1.97 × 105
8.00 × 104 0.892 2.25 × 105
9.00 × 104 1.00 2.53 × 105
1.00 × 105 1.12 2.81 × 105
1.06 × 105 1.18 2.97 × 105
Steel I Beam: W6 × 20 (Wide Flange 6 inch tall × 20 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
20.0 0.00357 225
30.0 0.00535 337
40.0 0.00714 449
50.0 0.00892 562
60.0 0.0107 674
70.0 0.0125 786
80.0 0.0143 899
90.0 0.0161 1010
100 0.0178 1120
200 0.0357 2250
300 0.0535 3370
400 0.0714 4490
500 0.0892 5620
600 0.107 6740
700 0.125 7860
800 0.143 8990
900 0.161 1.01 × 104
1000 0.178 1.12 × 104
2000 0.357 2.25 × 104
3000 0.535 3.37 × 104
4000 0.714 4.49 × 104
5000 0.892 5.62 × 104
6000 1.07 6.74 × 104
7000 1.25 7.86 × 104
8000 1.43 8.99 × 104
9000 1.61 1.01 × 105
1.00 × 104 1.78 1.12 × 105
2.00 × 104 3.57 2.25 × 105
2.64 × 104 4.72 2.97 × 105
Steel I Beam: W6 × 20 (Wide Flange 6 inch tall × 20 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
20.0 0.0181 505
30.0 0.0271 758
40.0 0.0361 1010
50.0 0.0452 1260
60.0 0.0542 1520
70.0 0.0632 1770
80.0 0.0723 2020
90.0 0.0813 2270
100 0.0903 2530
200 0.181 5050
300 0.271 7580
400 0.361 1.01 × 104
500 0.452 1.26 × 104
600 0.542 1.52 × 104
700 0.632 1.77 × 104
800 0.723 2.02 × 104
900 0.813 2.27 × 104
1000 0.903 2.53 × 104
2000 1.81 5.05 × 104
3000 2.71 7.58 × 104
4000 3.61 1.01 × 105
5000 4.52 1.26 × 105
6000 5.42 1.52 × 105
6860 6.20 1.73 × 105
Steel I Beam: W6 × 20 (Wide Flange 6 inch tall × 20 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
20.0 0.0571 899
30.0 0.0856 1350
40.0 0.114 1800
50.0 0.143 2250
60.0 0.171 2700
70.0 0.200 3140
80.0 0.228 3590
90.0 0.257 4040
100 0.285 4490
200 0.571 8990
300 0.856 1.35 × 104
400 1.14 1.80 × 104
500 1.43 2.25 × 104
600 1.71 2.70 × 104
700 2.00 3.14 × 104
800 2.28 3.59 × 104
900 2.57 4.04 × 104
1000 2.85 4.49 × 104
2000 5.71 8.99 × 104
2170 6.20 9.76 × 104
Steel I Beam: W6 × 20 (Wide Flange 6 inch tall × 20 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
20.0 0.139 1400
30.0 0.209 2110
40.0 0.279 2810
50.0 0.349 3510
60.0 0.418 4210
70.0 0.488 4910
80.0 0.558 5620
90.0 0.627 6320
100 0.697 7020
200 1.39 1.40 × 104
300 2.09 2.11 × 104
400 2.79 2.81 × 104
500 3.49 3.51 × 104
600 4.18 4.21 × 104
700 4.88 4.91 × 104
800 5.58 5.62 × 104
890 6.20 6.24 × 104
Steel I Beam: W6 × 20 (Wide Flange 6 inch tall × 20 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
20.0 0.289 2020
30.0 0.434 3030
40.0 0.578 4040
50.0 0.723 5050
60.0 0.867 6070
70.0 1.01 7080
80.0 1.16 8090
90.0 1.30 9100
100 1.45 1.01 × 104
200 2.89 2.02 × 104
300 4.34 3.03 × 104
400 5.78 4.04 × 104
429 6.20 4.34 × 104
Steel I Beam: W6 × 20 (Wide Flange 6 inch tall × 20 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
20.0 0.914 3590
30.0 1.37 5390
40.0 1.83 7190
50.0 2.28 8990
60.0 2.74 1.08 × 104
70.0 3.20 1.26 × 104
80.0 3.65 1.44 × 104
90.0 4.11 1.62 × 104
100 4.57 1.80 × 104
136 6.20 2.44 × 104
Steel I Beam: W6 × 20 (Wide Flange 6 inch tall × 20 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
20.0 2.23 5620
30.0 3.35 8420
40.0 4.46 1.12 × 104
50.0 5.58 1.40 × 104
55.6 6.20 1.56 × 104
Steel I Beam: W6 × 20 (Wide Flange 6 inch tall × 20 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
20.0 4.63 8090
26.8 6.20 1.08 × 104
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