Work it out.
Calculators
Stone weight and lifting check
Massefylde (fysik)
Board utilisation – number of tiles
Geometry
Mortar mix for setting natural stone
Håndværker-praksis (murerfaget, cement:sand 1:3)
Number of holes for splitting with plugs and feathers
Håndværker-praksis (plug-and-feather-metoden, The Stone Trust)
Max. overhang on a natural stone worktop
Marble Institute of America (MIA) – branchevejledning for stenplader
Water absorption and frost resistance
DS/EN 13755 (prøvningsprincip) + branche-tommelfingerregel
Natural stone steps – rise and going
Bygningsreglementet BR18 / SBi-anvisning 272
Grout consumption for stone tiles
Brancheformel (fugedybde × fugebredde = forbrug pr. løbende meter)
Yield from block to slabs
Branchedata (natursten-forarbejdning – typisk 10-30% spild ved blokskæring)
Speed for a diamond blade
Geometri/fysik – branche-hastighedsdata (granit 25-35 m/s, marmor 40-50 m/s)
Load per sling when slinging at an angle
BEK nr. 428 af 05/04/2022 om anvendelse af tekniske hjælpemidler §§ 25 og 58 (At-meddelelse 2.02.10 om anhugningsgrej blev ophævet 15-12-2025)
Diamond blade life in m²
Branchedata (diamantklinge-levetid, m²/klinge – værktøjsindustrien)
Topple safety for headstones (the 35 kg test)
Vejledning om sikring af gravsten (folkekirken) + statik (momentligevægt)
Max. cutting depth with an angle grinder
Geometri (klingeradius minus flange-/navradius)
Window sill — bottom flashing
Exact flat pattern
Tools that work in all subjects
Whatever your programme is called, these tools calculate the same — Pythagoras, area, percentages and units are not tied to one trade.
- Pythagorasa² + b² = c²Find the missing side, set out a right angle, check whether a room is square, and find the space diagonal.
- Area and perimeterm²Rectangle, triangle, trapezium, circle and composite shapes — area and perimeter.
- Volume and surface aream³ · lBox, cylinder, cone, sphere, pyramid, prism, pipe and frustum — also in litres.
- Percent%Percentage of, how many per cent, percentage change, discount and VAT.
- Scale and ratios1 : 50From drawing to reality, area and volume to scale, the rule of three and dividing in a ratio.
- Unit convertermm ↔ mFrom mm to km, Pa to bar and kB to GB — with the unit staircase.
- Time calculations and the clockt : minTime between two clock times, add time, and 1.75 h = 1 h 45 min for the timesheet.
- Slope and fall% · ° · 1:xFall from level to level, in per cent, per mille, degrees and mm per metre — and the height difference.
- Material consumption including wastem² + %Boards, paint, battens at c/c spacing and packs — for a composite surface or a whole room, with waste.