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Beam Load Calculator

Calculates support reactions, maximum shear and maximum bending moment for a simply supported beam under a distributed and point load.

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In short Beam Load Calculator is a free online tool on inputtesthub.com that calculates support reactions, maximum shear and maximum bending moment for a simply supported beam under a distributed and point load. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Beam Load Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Beam Load Calculator

The Beam Load Calculator calculates support reactions, maximum shear and maximum bending moment for a simply supported beam under a distributed and point load. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Checking the bending moment a span has to carry.
  • Working out the reaction at each support.
  • Preparing figures to take to an engineer.

Details

UDL momentwL² ÷ 8
Point load momentPL ÷ 4
Reaction, UDLwL ÷ 2
Maximum shearAt the supports

The maths behind it

This tool uses For a simply supported beam: reactions = total load ÷ 2, maximum moment from a UDL = wL²/8, and from a central point load = PL/4. Every intermediate value is shown on screen, so the result can be checked by hand.

This is statics only and deliberately does not tell you what beam to use. Choosing a section needs material grade, section modulus, deflection limits, lateral restraint, bearing and your local load combinations. Take these figures to a structural engineer — do not size a beam from them.

Frequently asked questions

Is there a limit on how often I can use the Beam Load Calculator?
It is free, with no account, no trial and no daily cap. Every calculators tool on inputtesthub.com works the same way: open the page and use it.
Is what I paste into the Beam Load Calculator stored?
No. The Beam Load Calculator runs entirely in your browser using JavaScript. Because the work happens locally, the tool also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
What is the equation behind the Beam Load Calculator?
It uses For a simply supported beam: reactions = total load ÷ 2, maximum moment from a UDL = wL²/8, and from a central point load = PL/4. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What is the Beam Load Calculator used for?
The most common reasons people reach for it: checking the bending moment a span has to carry. Working out the reaction at each support. Preparing figures to take to an engineer. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there a catch?
This is statics only and deliberately does not tell you what beam to use. Choosing a section needs material grade, section modulus, deflection limits, lateral restraint, bearing and your local load combinations. Take these figures to a structural engineer — do not size a beam from them.
What figures does the Beam Load Calculator work from?
UDL moment is wL² ÷ 8. Point load moment is PL ÷ 4. Reaction, UDL is wL ÷ 2. These are printed on the page itself, so you do not have to take them on trust.
Is the number rounded?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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