Free construction calculators
Calculators and reference tools for people who work in construction — concrete, rebar, drywall, roof pitch, U-values and more, in metric or US units. Built by Planium, the AI workspace for the construction industry.
Quantities & materials
Work out material quantities before you order — concrete, drywall, insulation, tile and more.
Concrete calculator
Volume for slabs, footings and columns — plus number of bags.
Open the toolRebar calculator
Weight per bar size, total weight for bars and mesh.
Open the toolDrywall calculator
Boards and studs for the wall, incl. waste margin.
Open the toolInsulation calculator
Area, volume and packs for walls, roofs and floors.
Open the toolDecking calculator
Deck boards, joists and screws for a deck or patio.
Open the toolPaint calculator
Paint volume from area, coats and coverage.
Open the toolTile calculator
Number of tiles, adhesive and grout — with waste margin.
Open the toolGravel calculator
From area and depth to tons — gravel, crushed stone, sand and soil.
Open the toolMeasurements & construction
Slopes, drawing scales, stairs and U-values — quick answers to common measurement questions.
Scale converter
Drawing measurement ⇄ real dimension at any scale.
Open the toolRoof pitch
Pitch in degrees/percent and true roof area.
Open the toolStair calculator
Steps, riser height and tread depth — with comfort check.
Open the toolSlope & grade
Percent ⇄ per-mille ⇄ mm/m ⇄ 1:N — with ramp check.
Open the toolU-value
Layer-by-layer calculation with lambda values for common materials.
Open the toolAsk the AI instead of digging through binders
Calculators answer numbers — Planium’s AI answers everything written in your construction documents. This is what it looks like in the app:
According to the room finish schedule, ground-floor interior walls are painted NCS S 1002-Y in sheen 7 (flat matte). Exception: walls in WC/cleaning rooms use sheen 20.
One more tool: all of Planium, free to try
Upload your documents, ask questions with source references, and draft specifications and minutes with AI — built for construction projects.