Paying for more lumber than you need adds up fast. Our board foot calculator converts your dimensions into accurate volume estimates so you can order with confidence.
Don't Guess at Lumber Volume
Lumber is priced by the board foot, and that single measurement is where a lot of projects quietly overpay. Order too much and you're paying to store deadwood. Order too little and you're paying premium prices for a rush delivery mid-build. Both outcomes are easy to avoid with a quick calculation.
Our board-foot calculator converts your dimensions into accurate volume in seconds, so you can order with confidence instead of crossing your fingers.
What a Board Foot Actually Is
A board foot is a piece of lumber one foot long, one foot wide, and one inch thick — 144 cubic inches of wood. The formula is straightforward: thickness in inches times width in inches times length in feet, divided by 12.
The trap is the nominal dimensions. A 2x4 isn't actually two by four inches once it's dried and dressed — it's tighter than that. Know whether your numbers are nominal or actual before you run them, or your estimate will be off.
- Board feet = (thickness in inches × width in inches × length in feet) ÷ 12
- For multiple pieces, multiply by the number of boards.
- Add waste for cutting, knots, and defects — 10–15% is a sane margin.
Know Your Dimension
If you're buying rough-sawn timber, nominal and actual are basically the same. If you're buying dressed lumber at the yard, they're not. Get the mill's actual measurements before you trust any volume math, especially on pricey species like cedar where a few board feet matters.
For something like a cedar accent wall, a timber beam, or a log-home trim package, the difference between rough and dressed can swing your invoice by hundreds of dollars. It's worth confirming.
Use It Before You Order
The whole point of the calculator is to keep you from over- or under-buying. Run your quantities, pad for waste, then round up to the nearest bundle or board the yard actually stocks.
And when your project involves real cedar — logs, beams, or trim — lean on the people who estimate that material daily. They'll catch things a general formula won't.
Big Twig Homes Team
Based in Hendersonville, NC, the Big Twig Homes team brings years of experience in cedar log homes and SIP panel construction. We share practical insights to help you build smarter.