FREE Calculator

Select your units then click "Add Beam" to begin. 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.
Force Units:

Length Units:

Solve Now
Type Point Location Point Magnitude Start Location End Location Start Magnitude End Magnitude Edit/Delete
Please select your units and add a beam to begin...

Need More Functionality?

SkyCiv offers a Student account, offering the SkyCiv Truss Software - allowing you to solve larger structures, with more supports and forces. SkyCiv also offers a full 3D Structural Analaysis Software in the cloud, complete with professional reporting, 3D Rendering and Stress Analysis. If you have any questions with the account types, simply contact us.


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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.

Use the table above 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 2 different concentrated point loads, 2 distributed loads and 2 moments. The distributed loads can be arranged 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 direction in 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 diagram of the 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.