Materials Design Center Processes Unit Conversion Formulas Mathematics
 Calculators Discussion Forum Trade Publications Directory Service
Salary Expectation

8 things to know about the interview question "What's your salary expectation"?

Essentials of Manufacturing

Information, coverage of important developments and expert commentary in manufacturing.

STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.

Selecting the Right 3D Printer

Discover how to choose the right 3D printer for your needs and the key performance attributes to consider.

more free publications
Glossary » Beams » Simply Supported » Uniformly Distributed Load » Four Equal Spans » 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 four equal spans, we compute the displacement at the middle of the first and fourth spans, and the maximum normal stress occuring at the second and fourth supports 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 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.

 Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft) L = 3.00 ft (lbf/ft) (in) (psi) 44.0 1.51 × 10-6 6.24 50.0 1.72 × 10-6 7.09 60.0 2.06 × 10-6 8.50 70.0 2.40 × 10-6 9.92 80.0 2.75 × 10-6 11.3 90.0 3.09 × 10-6 12.8 100 3.43 × 10-6 14.2 200 6.87 × 10-6 28.3 300 1.03 × 10-5 42.5 400 1.37 × 10-5 56.7 500 1.72 × 10-5 70.9 600 2.06 × 10-5 85.0 700 2.40 × 10-5 99.2 800 2.75 × 10-5 113 900 3.09 × 10-5 128 1000 3.43 × 10-5 142 2000 6.87 × 10-5 283 3000 1.03 × 10-4 425 4000 1.37 × 10-4 567 5000 1.72 × 10-4 709 6000 2.06 × 10-4 850 7000 2.40 × 10-4 992 8000 2.75 × 10-4 1130 9000 3.09 × 10-4 1280 1.00 × 104 3.43 × 10-4 1420 2.00 × 104 6.87 × 10-4 2830 3.00 × 104 0.00103 4250 4.00 × 104 0.00137 5670 5.00 × 104 0.00172 7090 6.00 × 104 0.00206 8500 7.00 × 104 0.00240 9920 8.00 × 104 0.00275 1.13 × 104 9.00 × 104 0.00309 1.28 × 104 1.00 × 105 0.00343 1.42 × 104 2.00 × 105 0.00687 2.83 × 104 3.00 × 105 0.0103 4.25 × 104 4.00 × 105 0.0137 5.67 × 104 5.00 × 105 0.0172 7.09 × 104 6.00 × 105 0.0206 8.50 × 104 7.00 × 105 0.0240 9.92 × 104 8.00 × 105 0.0275 1.13 × 105 9.00 × 105 0.0309 1.28 × 105 1.00 × 106 0.0343 1.42 × 105 2.00 × 106 0.0687 2.83 × 105 2.10 × 106 0.0720 2.97 × 105
 Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft) L = 5.00 ft (lbf/ft) (in) (psi) 44.0 1.17 × 10-5 17.3 50.0 1.32 × 10-5 19.7 60.0 1.59 × 10-5 23.6 70.0 1.85 × 10-5 27.6 80.0 2.12 × 10-5 31.5 90.0 2.38 × 10-5 35.4 100 2.65 × 10-5 39.4 200 5.30 × 10-5 78.7 300 7.95 × 10-5 118 400 1.06 × 10-4 157 500 1.32 × 10-4 197 600 1.59 × 10-4 236 700 1.85 × 10-4 276 800 2.12 × 10-4 315 900 2.38 × 10-4 354 1000 2.65 × 10-4 394 2000 5.30 × 10-4 787 3000 7.95 × 10-4 1180 4000 0.00106 1570 5000 0.00132 1970 6000 0.00159 2360 7000 0.00185 2760 8000 0.00212 3150 9000 0.00238 3540 1.00 × 104 0.00265 3940 2.00 × 104 0.00530 7870 3.00 × 104 0.00795 1.18 × 104 4.00 × 104 0.0106 1.57 × 104 5.00 × 104 0.0132 1.97 × 104 6.00 × 104 0.0159 2.36 × 104 7.00 × 104 0.0185 2.76 × 104 8.00 × 104 0.0212 3.15 × 104 9.00 × 104 0.0238 3.54 × 104 1.00 × 105 0.0265 3.94 × 104 2.00 × 105 0.0530 7.87 × 104 3.00 × 105 0.0795 1.18 × 105 4.00 × 105 0.106 1.57 × 105 5.00 × 105 0.132 1.97 × 105 6.00 × 105 0.159 2.36 × 105 7.00 × 105 0.185 2.76 × 105 7.54 × 105 0.200 2.97 × 105
 Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft) L = 10.0 ft (lbf/ft) (in) (psi) 44.0 1.87 × 10-4 69.3 50.0 2.12 × 10-4 78.7 60.0 2.54 × 10-4 94.5 70.0 2.97 × 10-4 110 80.0 3.39 × 10-4 126 90.0 3.82 × 10-4 142 100 4.24 × 10-4 157 200 8.48 × 10-4 315 300 0.00127 472 400 0.00170 630 500 0.00212 787 600 0.00254 945 700 0.00297 1100 800 0.00339 1260 900 0.00382 1420 1000 0.00424 1570 2000 0.00848 3150 3000 0.0127 4720 4000 0.0170 6300 5000 0.0212 7870 6000 0.0254 9450 7000 0.0297 1.10 × 104 8000 0.0339 1.26 × 104 9000 0.0382 1.42 × 104 1.00 × 104 0.0424 1.57 × 104 2.00 × 104 0.0848 3.15 × 104 3.00 × 104 0.127 4.72 × 104 4.00 × 104 0.170 6.30 × 104 5.00 × 104 0.212 7.87 × 104 6.00 × 104 0.254 9.45 × 104 7.00 × 104 0.297 1.10 × 105 8.00 × 104 0.339 1.26 × 105 9.00 × 104 0.382 1.42 × 105 1.00 × 105 0.424 1.57 × 105 1.89 × 105 0.800 2.97 × 105
 Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft) L = 15.0 ft (lbf/ft) (in) (psi) 44.0 9.44 × 10-4 156 50.0 0.00107 177 60.0 0.00129 213 70.0 0.00150 248 80.0 0.00172 283 90.0 0.00193 319 100 0.00215 354 200 0.00429 709 300 0.00644 1060 400 0.00859 1420 500 0.0107 1770 600 0.0129 2130 700 0.0150 2480 800 0.0172 2830 900 0.0193 3190 1000 0.0215 3540 2000 0.0429 7090 3000 0.0644 1.06 × 104 4000 0.0859 1.42 × 104 5000 0.107 1.77 × 104 6000 0.129 2.13 × 104 7000 0.150 2.48 × 104 8000 0.172 2.83 × 104 9000 0.193 3.19 × 104 1.00 × 104 0.215 3.54 × 104 2.00 × 104 0.429 7.09 × 104 3.00 × 104 0.644 1.06 × 105 4.00 × 104 0.859 1.42 × 105 5.00 × 104 1.07 1.77 × 105 6.00 × 104 1.29 2.13 × 105 7.00 × 104 1.50 2.48 × 105 8.00 × 104 1.72 2.83 × 105 8.38 × 104 1.80 2.97 × 105
 Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft) L = 20.0 ft (lbf/ft) (in) (psi) 44.0 0.00298 277 50.0 0.00339 315 60.0 0.00407 378 70.0 0.00475 441 80.0 0.00543 504 90.0 0.00611 567 100 0.00678 630 200 0.0136 1260 300 0.0204 1890 400 0.0271 2520 500 0.0339 3150 600 0.0407 3780 700 0.0475 4410 800 0.0543 5040 900 0.0611 5670 1000 0.0678 6300 2000 0.136 1.26 × 104 3000 0.204 1.89 × 104 4000 0.271 2.52 × 104 5000 0.339 3.15 × 104 6000 0.407 3.78 × 104 7000 0.475 4.41 × 104 8000 0.543 5.04 × 104 9000 0.611 5.67 × 104 1.00 × 104 0.678 6.30 × 104 2.00 × 104 1.36 1.26 × 105 3.00 × 104 2.04 1.89 × 105 4.00 × 104 2.71 2.52 × 105 4.72 × 104 3.20 2.97 × 105
 Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft) L = 25.0 ft (lbf/ft) (in) (psi) 44.0 0.00729 433 50.0 0.00828 492 60.0 0.00994 591 70.0 0.0116 689 80.0 0.0132 787 90.0 0.0149 886 100 0.0166 984 200 0.0331 1970 300 0.0497 2950 400 0.0662 3940 500 0.0828 4920 600 0.0994 5910 700 0.116 6890 800 0.132 7870 900 0.149 8860 1000 0.166 9840 2000 0.331 1.97 × 104 3000 0.497 2.95 × 104 4000 0.662 3.94 × 104 5000 0.828 4.92 × 104 6000 0.994 5.91 × 104 7000 1.16 6.89 × 104 8000 1.32 7.87 × 104 9000 1.49 8.86 × 104 1.00 × 104 1.66 9.84 × 104 2.00 × 104 3.31 1.97 × 105 3.00 × 104 4.97 2.95 × 105 3.02 × 104 5.00 2.97 × 105
 Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft) L = 30.0 ft (lbf/ft) (in) (psi) 44.0 0.0151 624 50.0 0.0172 709 60.0 0.0206 850 70.0 0.0240 992 80.0 0.0275 1130 90.0 0.0309 1280 100 0.0343 1420 200 0.0687 2830 300 0.103 4250 400 0.137 5670 500 0.172 7090 600 0.206 8500 700 0.240 9920 800 0.275 1.13 × 104 900 0.309 1.28 × 104 1000 0.343 1.42 × 104 2000 0.687 2.83 × 104 3000 1.03 4.25 × 104 4000 1.37 5.67 × 104 5000 1.72 7.09 × 104 6000 2.06 8.50 × 104 7000 2.40 9.92 × 104 8000 2.75 1.13 × 105 9000 3.09 1.28 × 105 1.00 × 104 3.43 1.42 × 105 2.00 × 104 6.87 2.83 × 105 2.10 × 104 7.20 2.97 × 105
 Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft) L = 40.0 ft (lbf/ft) (in) (psi) 44.0 0.0478 1110 50.0 0.0543 1260 60.0 0.0651 1510 70.0 0.0760 1760 80.0 0.0868 2020 90.0 0.0977 2270 100 0.109 2520 200 0.217 5040 300 0.326 7560 400 0.434 1.01 × 104 500 0.543 1.26 × 104 600 0.651 1.51 × 104 700 0.760 1.76 × 104 800 0.868 2.02 × 104 900 0.977 2.27 × 104 1000 1.09 2.52 × 104 2000 2.17 5.04 × 104 3000 3.26 7.56 × 104 4000 4.34 1.01 × 105 5000 5.43 1.26 × 105 6000 6.51 1.51 × 105 7000 7.60 1.76 × 105 8000 8.68 2.02 × 105 9000 9.77 2.27 × 105 1.00 × 104 10.9 2.52 × 105 1.18 × 104 12.8 2.97 × 105
 Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft) L = 50.0 ft (lbf/ft) (in) (psi) 44.0 0.117 1730 50.0 0.132 1970 60.0 0.159 2360 70.0 0.185 2760 80.0 0.212 3150 90.0 0.238 3540 100 0.265 3940 200 0.530 7870 300 0.795 1.18 × 104 400 1.06 1.57 × 104 500 1.32 1.97 × 104 600 1.59 2.36 × 104 700 1.85 2.76 × 104 800 2.12 3.15 × 104 900 2.38 3.54 × 104 1000 2.65 3.94 × 104 2000 5.30 7.87 × 104 3000 7.95 1.18 × 105 4000 10.6 1.57 × 105 5000 13.2 1.97 × 105 6000 15.9 2.36 × 105 7000 18.5 2.76 × 105 7540 20.0 2.97 × 105
 Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft) L = 60.0 ft (lbf/ft) (in) (psi) 44.0 0.242 2490 50.0 0.275 2830 60.0 0.330 3400 70.0 0.385 3970 80.0 0.440 4540 90.0 0.495 5100 100 0.549 5670 200 1.10 1.13 × 104 300 1.65 1.70 × 104 400 2.20 2.27 × 104 500 2.75 2.83 × 104 600 3.30 3.40 × 104 700 3.85 3.97 × 104 800 4.40 4.54 × 104 900 4.95 5.10 × 104 1000 5.49 5.67 × 104 2000 11.0 1.13 × 105 3000 16.5 1.70 × 105 3760 20.7 2.13 × 105
 Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft) L = 70.0 ft (lbf/ft) (in) (psi) 44.0 0.448 3400 50.0 0.509 3860 60.0 0.611 4630 70.0 0.713 5400 80.0 0.814 6170 90.0 0.916 6950 100 1.02 7720 200 2.04 1.54 × 104 300 3.05 2.32 × 104 400 4.07 3.09 × 104 500 5.09 3.86 × 104 600 6.11 4.63 × 104 700 7.13 5.40 × 104 800 8.14 6.17 × 104 900 9.16 6.95 × 104 1000 10.2 7.72 × 104 2000 20.4 1.54 × 105 2030 20.7 1.57 × 105
 Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft) L = 80.0 ft (lbf/ft) (in) (psi) 44.0 0.764 4430 50.0 0.868 5040 60.0 1.04 6050 70.0 1.22 7060 80.0 1.39 8060 90.0 1.56 9070 100 1.74 1.01 × 104 200 3.47 2.02 × 104 300 5.21 3.02 × 104 400 6.95 4.03 × 104 500 8.68 5.04 × 104 600 10.4 6.05 × 104 700 12.2 7.06 × 104 800 13.9 8.06 × 104 900 15.6 9.07 × 104 1000 17.4 1.01 × 105 1190 20.7 1.20 × 105
 Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft) L = 90.0 ft (lbf/ft) (in) (psi) 44.0 1.22 5610 50.0 1.39 6380 60.0 1.67 7650 70.0 1.95 8930 80.0 2.23 1.02 × 104 90.0 2.50 1.15 × 104 100 2.78 1.28 × 104 200 5.56 2.55 × 104 300 8.35 3.83 × 104 400 11.1 5.10 × 104 500 13.9 6.38 × 104 600 16.7 7.65 × 104 700 19.5 8.93 × 104 743 20.7 9.47 × 104
 Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft) L = 100 ft (lbf/ft) (in) (psi) 44.0 1.87 6930 50.0 2.12 7870 60.0 2.54 9450 70.0 2.97 1.10 × 104 80.0 3.39 1.26 × 104 90.0 3.82 1.42 × 104 100 4.24 1.57 × 104 200 8.48 3.15 × 104 300 12.7 4.72 × 104 400 17.0 6.30 × 104 487 20.7 7.67 × 104
 Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft) L = 125 ft (lbf/ft) (in) (psi) 44.0 4.55 1.08 × 104 50.0 5.18 1.23 × 104 60.0 6.21 1.48 × 104 70.0 7.25 1.72 × 104 80.0 8.28 1.97 × 104 90.0 9.32 2.21 × 104 100 10.4 2.46 × 104 200 20.7 4.91 × 104
 Steel I Beam: W21 × 44 (Wide Flange 21 inch tall × 44 lbf/ft) L = 150 ft (lbf/ft) (in) (psi) 44.0 9.44 1.56 × 104 50.0 10.7 1.77 × 104 60.0 12.9 2.13 × 104 70.0 15.0 2.48 × 104 80.0 17.2 2.83 × 104 90.0 19.3 3.19 × 104 96.3 20.7 3.41 × 104
Related Pages
Salary Expectation

8 things to know about the interview question "What's your salary expectation"?

Essentials of Manufacturing

Information, coverage of important developments and expert commentary in manufacturing.

STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.

Selecting the Right 3D Printer

Discover how to choose the right 3D printer for your needs and the key performance attributes to consider.