Wood & Lumber Calculators
Free calculators for the timber trade: scale round logs with the Hoppus, Huber/Smalian/Newton and JAS rules, then convert volumes, board feet and prices between every common unit.
Log scaling
Hoppus Volume Calculator (Quarter-Girth Rule)
Calculate Hoppus volume, true volume and Hoppus tons for round logs — free.
Read the guide →Log Volume Calculator (Huber, Smalian, Newton)
Estimate the cubic volume of a log with Huber, Smalian or Newton — free.
Read the guide →JAS Log Scale Calculator (Japanese Agricultural Standard)
Scale logs to the JAS rule with diameter rounding and ovality — free.
Read the guide →Trade units & lumber
Timber Unit Converter (m³, BF, MBF, Hoppus)
Convert between cubic metres, board feet, Hoppus units and prices — free.
Read the guide →Board Feet Calculator
Calculate board feet, total volume and lumber cost for any board — free.
Read the guide →Lumber Weight Calculator (kg/m³)
Weight of any board by species and size, dry or green — density table for 18 species included. Free.
Read the guide →Firewood Calculator (cord, stere & m³)
Convert firewood volume between cord, stere/Raummeter, stacked m³ and loose m³ — plus weight by wood species. Free.
Read the guide →Shipping & Logistics
Green Log Weight Calculator
Weight of round timber at any moisture content, by species — Wood Handbook 2021 data.
Read the guide →Stowage Factor Calculator
SF = volume ÷ tonnes — check timber parcels against IMO reference ranges.
Read the guide →Container Loading Calculator
How many cartons fit before cube-out or weigh-out — 20GP, 40GP, 40HC.
Read the guide →Sawmilling
Kiln Drying
Wood Moisture Content Calculator
MC, basis conversion and drying-outcome — Wood Handbook 2021 equations.
Read the guide →Wood Shrinkage Calculator
Tangential, radial and volumetric shrinkage by species — Wood Handbook 2021 Eq. 4-9.
Read the guide →Wood EMC Calculator
Equilibrium moisture content from temperature and RH (Hailwood–Horrobin, Simpson 1973).
Read the guide →Kiln Capacity Calculator
Wood volume per charge from stack size, board thickness and sticker thickness (AH-188).
Read the guide →Rough Sizing Calculator
Convert between finished (planed) and rough-sawn dimensions — before kiln drying.
Read the guide →Machining & finishing
Plywood Cutting Calculator
Optimise plywood and panel sheet layouts with kerf, grain lock, edge banding and offcut reuse - the same engine as our sheet cutting calculator, preset for 2440 × 1220 mm panels.
Read the guide →Manufacturing Yield Calculator
Chain sawing, drying, machining and finishing yields into one recovery figure - and see how much roundwood a target output really needs.
Read the guide →Wood Glue Calculator
Adhesive quantity for edge gluing, panel lay-ups and face lamination from TDS spread rates in g/m², with waste allowance and cost.
Read the guide →Paint Coverage Calculator
Coating quantity for wood finishing from volume solids, dry film thickness and transfer efficiency - or straight from the data-sheet coverage.
Read the guide →CBM Calculator
Carton volume in cubic metres for export shipments: per-line and total CBM, gross weight, and a cube-out / weigh-out check against a 40 HC container.
Read the guide →BOM Cost Calculator
Bill-of-materials costing for furniture: waste-inflated buy quantities, line and total costs, cost per product and a selling price from your target margin.
Read the guide →