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Welcome to our free online bending moment and shear force diagram calculator which can generate the Reactions, Shear Force Diagrams (SFD) and Bending Moment Diagrams (BMD) of a simply supported beam. Simply add a beam length, supports and then apply loads where you want them! Also remember to select your units. Once you have drawn the beam you want, please click the "Solve" button to calculate the Reactions, SFD, BMD and other data. This free online bending moment calculator generates and draws Shear Force Diagrams (SFD) and Bending Moment Diagrams (BMD) of simply supported beams. Customize your own beam and loads and hit "Solve" when done!

Click "Add Beam" to start calculator. Watch this video if you're unsure how to use the calculator.
Use the table underneath the calculator to view and delete the components you add.

Select Force Units:

Select Length Units:

Solve Now

Support Location



Starting Location Ending Location Starting Magnitude Ending Magnitude

Use the table below to view and delete the beam length, supports and added loads. Any changes made will automatically re-draw the free body diagram of your simply supported beam. Bending Moment Calculations are made once the "Solve" button is hit and will automatically generate the Shear Force and Bending Moment Diagrams.

The above calculator is a versatile engineering tool used to calculate the bending moment in a beam. It is able to accommodate up to 4 different point loads, 4 distributed loads and 4 moments. The distributed loads can be arrange so that they are uniformly distributed loads (udl), triangular distributed loads or trapezoidal distributed loads. All loads and moments can be of both upwards (+) or downward (-) magnitude, which should be able to account for most common beam analysis situations. Bending Moment and Shear Force calculations may take up to 10 seconds to appear and please note you will be directed to a new page with the reactions, shear force diagram and bending moment of a beam.

Again the calculator and the results of the SFD and BMD should not be used in actual beam design. Though the results are accurate, these calculations of bending moment diagrams and shear force diagrams are for educational purposes only - This calculator is very useful in helping school and university students with their degrees.