# Lumber Calculator

I know how many boards I need and their dimensions. Is there some sort of calculator that can tell me how many long boards to buy so that I lower the cost? For example, I need 2 60" 2x4's and I also need 2 20" 2x4's. You might just buy 2 96" boards and get your cut out of that but it might be cheaper to buy 1 16' 2x4 and get it all out of that. I'm looking for a calculator that has that kind of algorithm.

• I mean no offense but due to the project specific nature, coupled with local availability, I think your best bet is your brain. It would be interesting to write a little script for it though - given available board dimensions and cost per board, compute the minimum \$\$ for any particular parts list assuming you can rip/crosscut anything. Even then you must factor in %-age error because you could waste a large portion of a board if you cut it wrong and the margins are very tight. Feb 16, 2017 at 1:41
• Cutlist Optimiser. It's wonderful. play.google.com/store/apps/details?id=com.cutlistoptimizer Mar 22, 2021 at 19:05
• @NaralieNBenek Hi, welcome to StackExchange. Thanks for your addition, but you might want to specifically mention that this app is for optimised cutting of panels from sheet goods and not lumber, which is actually what the original Question asked about. Mar 22, 2021 at 23:20
• Well this is a great addition to the conversation actually. My question may have been slightly specific only in that I was giving 2x4 as an example. This great @NatalieNBenek if you add it as an answer I'll be glad to mark it as the only answer that's been really given with a usable app. Mar 24, 2021 at 15:12
• Hi Kristopher, if Natalie did return, ads this again as an Answer and you select it, it devalues the original Question and the well-meaning Answers you already received. Even if they weren't quite what you hoped for/wanted, they did answer the Question as posed. This latest addition, while you may find it of interest now, 4 years on, is technically an Answer to a different query entirely...... so, I suggest the ideal thing to do is for you to ask that exact Question, setting it up so that you can tick their Answer (and simultaneous making it more directly findable for future searchers). Mar 26, 2021 at 9:17

The question is inherently too subjective for any single calculator. There are whole industries dedicated to this, and even then the software must be constantly amended, and customized to each company's specific use and needs.

Longer material may be cheaper, but that depends heavily on the choice of material, and ability to source the species in those lengths.

Beyond that you must make transportation and tooling constraints. You may not be able to transport a 16' board at all, even if it would be cheaper.

The woodworking software industry is about as fragmented as any, and as a result there are a lot of optimization programs out there that vary across a very wide spectrum, and very rarely are the cheap or free ones very useful.

Even with this, a very high percentage still does things the old fashioned way, cut-listing by hand, or using Excel or some other generic program.

• This is, really, the correct answer.
– user5572
Mar 23, 2021 at 12:25

You might be able to do this for dimensional lumber (i.e., your standard 1x and 2x material), since there are several "standard" lengths - 6', 8', and 10' being the most common*, with 12' and 16' being fairly widely available, in the US at least. My local hardwood dealer carries some 7' and 9' pre-milled boards, though, so maybe there aren't any standards... It will also work for plywood since those sheets are standard sizes (4'x8', 5'x5' typically). It is not likely to be available for rough cut lumber because the only standard dimension there is thickness (4/4, 6/4, 8/4, etc).

Looking at this question and this one, though, a lot of people tend to make their own cut lists / layouts because the products that do exist aren't very good, or don't produce layouts which minimize waste. Throw cost into the equation, too, and that adds a whole layer of complexity that most programs don't even try to tackle.

Your best bet is to get Sketchup (available for free) or a similar piece of software, or break out the good 'ol graph paper, and try several different layouts yourself. You know what sizes your local store carries and so you can come up with a couple different layouts for the typical lengths available in your area.

*Given that you said 2x4, I assume you're buying from the big box stores and not buying from a specialized (hard)wood shop. Those are the typical sizes at my local big box stores; YMMV of course.

• I certainly do mean to use dimensional lumber. Feb 15, 2017 at 21:29
• For serious hardwood work, there's also the question of what parts of which boards have grain patterns suitable for which parts of the project, even if the parts need to be cut at an angle to the board's current dimensions. Some pros go in with their cut list and notes, tape meadire, chalk, and (with vendor's permission) a small plane so tey can better see grain in rough-cut boards, and do the full project layout right there, sorting through boards to find the ones that best suit their needs. (Closest I've come to that is the sorting.) Feb 16, 2017 at 17:35