📐 Framing, Lumber & Math Calculators
📝 JusTheTool Editorial | 🔄 Last reviewed: July 21, 2026 | 13 tools
This is the general-purpose set: the geometry and unit conversions that sit underneath every other estimate on the site. Board feet, linear feet, square footage, volume, and the right-triangle maths that rafters and stairs both depend on.
If you are not sure which calculator you need, start here — most material questions reduce to an area or a volume first.
Most used in this category
- Linear Footage Calculator
Free linear footage calculator. Learn how to calculate linear feet for baseboards, convert square feet to linear feet for decking, and measure fencing. - Volume in Gallons Calculator (Tank, Pool & Pipe)
Calculate the exact liquid volume for rectangular tanks, swimming pools, aquariums, and cylindrical pipes. Instantly convert cubic feet to gallons.
All framing, lumber and math tools
- Wall Stud & Framing Calculator
Calculate how many studs and plate boards you need for a wall. Supports 16, 24, and 12-inch on-center spacing, corners, and openings. - Board Foot & Lumber Calculator
Calculate exactly how many board feet and the total cost of your lumber. Accounts for nominal vs actual dimensions and rough-to-finish waste. - Wood Beam Calculator
Free wood beam calculator for built-up beam material and cost. Calculate board feet, lumber count, and price once you know your required beam size. - Square Footage Calculator
Calculate exact square footage for any room or shape. Formulas for rectangles, L-shapes, triangles, circles. Ideal for flooring, paint, roofing. - Right Triangle Calculator
Right triangle calculator and solver. Enter any two values (legs, hypotenuse, or an angle) to find the missing sides, angles, area, and perimeter. - Acreage & Square Footage Master Converter
Instantly convert acres to square feet, square inches to square feet, and learn how to easily calculate the square footage of any building or irregular lot - Golden Ratio Calculator
Golden ratio calculator. Enter any measurement to get the longer and shorter golden segments (phi = 1.618) and the golden split of your value. - Epoxy Calculator: Resin Volume & Coverage
Calculate exact epoxy resin volume for river tables, casting molds, countertops, and deep pour projects. Includes coverage charts and mixing ratios. - The Ultimate Epoxy River Table Guide
Master mixing, pouring, and finishing epoxy resin. Includes a lift depth & exotherm risk reference chart and a printable pour day checklist. - 3D Print Cost Calculator
Calculate the true cost of your 3D prints. Factors in filament weight, spool price, print time, electricity usage, and failure rates. - Free Printable Ruler (Actual Size PDF)
Free printable ruler PDF in actual size: 9-inch ruler with 1/16 inch divisions plus a 22 cm metric ruler. Includes calibration check square so your print i
Before you order
- Measure twice, at the building. Plans and reality diverge. A wall drawn at 30 ft is often 30 ft 1 in once framed.
- Add a waste factor. Every calculator here exposes one. The defaults are industry-standard ranges, not guarantees — complex layouts need more.
- Confirm code locally. We cite the model IRC where a limit applies. Your jurisdiction amends it, and your building department has the final word.
- These are estimates, not quotes. Useful for budgeting and comparing options; not a substitute for a supplier quote or a licensed professional.
How we derive every figure is set out on our methodology page, including the code sections and manufacturer specs behind each constant.
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