This app will calculate the approximate maximum span of a beam, joist, etc. with a symmetric cross section based on the following inputs (Most are automatically entered using the picker views):
- Height
- Width
- Point Dead Load Applied at Centre
- Dead Distributed Load
- Point Live Load Applied at Centre
- Live Distributed Load
- Maximum Stress
- Modulus of Elasticity
- Live Load Deflection Limit (Fraction of Span)
- Total Load Deflection Limit (Fraction of Span)

This app operates in U.S. units by default although there is a setting to use metric units (picker views always display in imperial but will enter metric values if the app is set to metric).

This app has an option for a light or dark appearance.

This app makes several assumptions and approximations and neglects multiple factors that are necessary to consider including but not limited to neglecting shear.

More features may be added in an update released later.

Disclaimer: For entertainment purposes only, have real construction applications professionally engineered as all construction situations are different.

What’s New

Version 4.2

Adds a button at the bottom of the scroll view to rate this app (only displayed on iOS 10.3 and newer).

Ratings and Reviews

2.4 out of 5
9 Ratings

9 Ratings

Jason Thomas86 ,

Pretty good

Simple. Can customize yield stress psi. Gives load capacities for pretty much all residential applications. This is not for commercial building use at all. Can size all wood joist, wood beams, and A36 steel up to 12” tall steel I-beams. If you need to size beams quickly for residential use, this will work well.

Chasedzn ,

I want my money back

Useless. Program crashes when asked to ‘calculate’.

refund apple app ,

RAWood Repairs LLC

Will not calculation true numbers of span length
I want a refund.
Hope Apple will investigate your app


Kyle McCarroll
15.3 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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