18 calculators · metric and imperial
Calculators for every stage of a build
Each tool shows its formula, a worked example and the limits of what it models. Inputs stay in your browser.
01Lumber & cost
Volume, price and the gap between nominal labels and real boards.
- Board Foot CalculatorLumber volume from thickness, width, length and quantity, with optional price.
- Lumber/Timber Cost CalculatorMaterial cost from quantity, unit price, waste and extra allowance.
- Nominal to Actual Lumber Size CalculatorSourced dressed sizes for North American softwood labels.
- Board Foot to Linear Foot CalculatorBoard feet to linear feet and back, on nominal or dressed size.
- Wood Weight CalculatorWeight from species density, dimensions, moisture and quantity.
02Panels & cutting
Where material is lost between the mark and the finished part.
03Outdoor builds
Surface boards, pickets and posts for decks and fences.
04Framing, fixing & movement
Layout and fastener-placement geometry before any structural check, and how wood changes size.
- Stair Stringer CalculatorRise, run, tread count and stringer length for layout.
- Rafter CalculatorCommon rafter length, pitch and overhang geometry.
- Fastener Spacing Calculator for Nails and ScrewsNail and screw spacing, end and edge distances from Eurocode 5 or NDS guidance.
- Wood Movement CalculatorSeasonal expansion across the grain from species shrinkage data.
05Interiors & furniture
Wall panelling layout, river-table resin volumes and how far a shelf will sag.
- Board and Batten, Wainscoting and Shiplap Layout CalculatorEqual batten spacing, wainscot rails and shiplap rip widths for one wall.
- Epoxy Resin Calculator for River Tables and PoursRiver-table epoxy volume less the slabs, split into layers, resin and hardener.
- Shelf Sag CalculatorBeam-theory shelf deflection with edging, creep and a sag guideline.