Lumber Calc

Under review

Free lumber calculator for deck, stair and rafter cuts

Plan lumber cuts and takeoffs with free calculators for board feet, decks, stairs, balusters, and rafters, plus diagrams and shopping lists.

Productivity · Design Tools · Free

Coming soon on Launch Llama Tools

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Plan lumber cuts and takeoffs with free calculators for board feet, decks, stairs, balusters, and rafters, plus diagrams and shopping lists.

About

Lumber Calc publishes free English calculators for board feet, log scales, stairs, deck takeoffs, baluster spacing, and rafters. DIY homeowners, hobby woodworkers, and small contractors can use the tools to plan cuts, layouts, and material lists before buying lumber. Lengths stay exact to 1/16 inch until the final display, and measurements stay in your browser rather than being sent to a server. Calculator pages include diagrams, worked examples, and shopping lists where available; optional checks cite IRC and DCA 6. Results are planning estimates, not structural designs, approvals, or manufacturer specifications. Verify field measurements and local code requirements with the appropriate professionals before building.

Key Features

Calculators for board feet, logs, decks, stairs, balusters, cut lists, and rafters
Diagrams, worked examples, and material takeoffs with printable shopping lists
Lengths stay exact to 1/16 inch until final display; optional checks cite IRC and DCA 6
Entered measurements stay in your browser rather than being sent to a server

Use Cases

Calculating board feet and cut lists before ordering hardwood or dimensional lumber at the yard
Laying out stair risers, treads, and stringer cut marks before building a stair
Estimating deck boards, screws, and waste for a single deck surface

From the founder

Who it's for

“DIY homeowners, hobby woodworkers, and small contractors who need board-foot estimates, deck and stair layouts, or rafter measurements before buying or cutting lumber.”

Why I built it

“We built Lumber Calc to make common lumber planning easier to check before a project starts. It pairs calculators with diagrams, shopping lists, and optional code references, while keeping entered measurements in your browser.”

— [email protected], founder of Lumber Calc

Who it is for

DIY homeowners planning deck, stair, or fence projects
Hobby woodworkers pricing lumber and planning cuts
Small contractors doing lumber takeoffs and rafter layout

Pricing

Lumber Calc is free to use. See the website for details.

FAQ

Do these calculators replace a building inspector or engineer? +

No. Lumber Calc helps you estimate lumber, layout, and IRC-style checks before you buy or cut. A local code official, structural engineer, or lumber supplier still decides what is acceptable on your job. Use the disclaimer and methodology pages when you need the limits in writing.

Where do the numbers on each page come from? +

Each tool page shows the formula, a hand-checked example, and the same math our automated tests run. Methodology lists the code sections and lumber rules we cite. If a worked example on the page does not match what you see in the calculator, email us with the share link.

Why is there no account or cloud save? +

Inputs stay in your browser unless you copy a share link or save a project locally on Lumber Calc. That keeps pricing and room dimensions off our servers. Saved projects and cookie choices are described on the privacy page.

Which calculator should I open first on a deck build? +

Start with deck board calculator when you know the deck size and board layout. Use deck project when you want one list for framing, boards, stairs, and railing together. Outdoor stair and baluster tools plug in when you size those pieces separately.