Measure twice.
Calculate once.
Plain, fast construction calculators with live technical diagrams, equal-spacing marks and results you can actually use at the bench or on site.
213.9 mm
Start with a popular tool
Rafter length, rise, birdsmouth and live cutting diagram.
Open calculator →Even risers, total run, stringer marks and headroom.
Open calculator →Centers, clear gaps and a running mark-out list.
Open calculator →Slab volume, order quantity, weight and cost.
Open calculator →New tools for real site conditions
Datum levels, design falls and cut-or-fill set-out at every station.
Open calculator →Inverts, falls, rolling offsets, fitting angles and true travel.
Open calculator →Offsets, saddles, shrink and mark positions for accurate bends.
Open calculator →Fit panels, battens or tiles to a real opening that is not perfectly square.
Open calculator →Inputs, drawing and results stay together.
Adjust a field or drag a control. The diagram redraws immediately, dimensions remain legible, and the running marks are ready to take with you.
- 1Enter the known dimensionsMetric or imperial, with practical defaults.
- 2Fine-tune visuallySliders and diagrams move together.
- 3Mark out with confidenceUse the result list, diagram or print view.
Browse by the job in front of you
Roof & rafters
Rafter cuts, pitches, framing plans and roof geometry.
10 tools →02Stairs & balustrades
Rise, run, stringers, headroom and baluster layouts.
5 tools →03Centers & spacing
Equal gaps, running marks, panels, battens and fasteners.
16 tools →04Concrete & masonry
Slabs, beams, rebar, blocks, arches and quantities.
14 tools →05Metal & tubing
Notches, miters, reducers, bends and wrap templates.
8 tools →06Printable templates
Full-scale circles, arcs, cones, tapes and protractors.
8 tools →07Decks & fencing
Joists, boards, posts, panels, palings and costs.
7 tools →08Convert & measure
Length, area, volume, weight, scale, pitch and angles.
9 tools →09General geometry
Arcs, circles, polygons, miters, bracing and layouts.
11 tools →10Materials & quantities
Tiles, timber, cladding, paving and project estimates.
12 tools →11Triangles & angles
Triangle solvers, polygons, chords and angle conversion.
5 tools →12Tanks & volumes
Tank capacity, dip charts and liquid volumes.
3 tools →13Mechanical & workshop
Pulleys, belts, sprockets, RPM and surface speed.
4 tools →14Wood joints
Dovetails, mortise and tenon and joint set-out.
2 tools →15Site levels & services
Datums, falls, pipe grades, offsets and field verification.
2 tools →Cut wet, use extraction and wear the right respiratory protection for the material.