Work it out.
Calculators tailored to the carpentry trade: measure the material consumption, divide the run into centre-to-centre spacing, find the rafter length, set out the staircase and work out the concrete. Enter your own values — the result updates live.
Step V — Directory
The guided workflow: answer house dimensions and chosen roofing material and get the complete roof specification brought together in one flow.
Step A — Measurement & material consumption
Start here: convert area into a number of boards/sheets and linear metres — with your own waste allowance.
Step B — Spacing & centre distance
Count rafters, battens and posts correctly over a span based on the centre spacing (cc).
Step C — Roof & rafters
Find the rafter length and roof pitch of a symmetrical gable roof using Pythagoras.
Step D — Stairs
Set the riser, going, and number of steps according to Blondel's stride formula.
Step E — Concrete & foundation
Calculate the concrete volume for a rectangular pour, so the concrete can be ordered in one go.
Step F — Building physics & material
Wood moisture and shrinkage, U-value against BR18, and how much cross-section burns away — the trade's physics check.
Tools that work in all subjects
De her fire hører ikke til ét fag — de regner og tegner det samme, uanset hvad du er uddannet til.
- 3D-workshop3D · DXFFigurerne i rummet — med flad udfoldning, DXF til CNC-laser og pap-guide.
- The Unfolding Library45 figurerPlade-figurer foldet ud til skæremønster, i millimeter og med ærligt kvalitetsmærke.
- Kasse-udfolderKasse · DXFHele kassen foldet ud: buk, hjørner, overlæg og nittehuller. Print 1:1 eller hent DXF.
- Rør-rute-bygger — 3DRør i 3DKæd rør-segmenter til et helt rør-kort — med sik, overlæg og materiale-total.