Work it out.
Calculators
Heavy lifting — weight against distance limit
Kilde: Arbejdstilsynet (AT-vejledning om ergonomisk arbejdsmiljø (VEJ nr. 10133 af 01/10/2026))
Chlorine disinfection — tablets and ppm
Ren matematik (1 mg/L = 1 ppm) — referenceniveauer: NIR Desinfektion 2.2
Meeting catering — quantities per cover
Ren matematik (antal × mængde pr. person)
Dilution calculator — ratios to ml/litre and per cent
Ren matematik (branchekonvention for doseringsforhold, fx 1:100)
Pushing a cleaning trolley — total weight and ramp
Kilde: Arbejdstilsynet (AT-vejledning om ergonomisk arbejdsmiljø (VEJ nr. 10133 af 01/10/2026))
Repetitive monotonous work (EGA) — cycle time check
Kilde: Arbejdstilsynet (AT-vejledning om ergonomisk arbejdsmiljø (VEJ nr. 10133 af 01/10/2026), afsnittet om ensidigt belastende og ensidigt gentaget arbejde)
INSTA 800 — compliance rate of inspection points
Kilde: DS/INSTA 800 (fællesnordisk kvalitetsstandard for rengøring) — terminologi: kvalitetsniveau, AQL, kontrolpunkt
Hand sanitiser consumption per shift
Kilde: NIR Håndhygiejne 2.1 (SSI/CEI, 2021, rettet 2026), afsnit 9.2.2 — mængde og indgnidningstid ved hånddesinfektion
Canteen — food waste against industry benchmark
Kilde: Miljøstyrelsen (kortlægning af madaffald, 2024) og Stop Spild Af Mad — benchmarks for kantiner
Laundry — load factor and number of machine washes
Ren matematik (maskinens egen kapacitetsangivelse + jeres valgte fyldningsgrad)
Waste volume and sacks per week
Ren matematik (jeres egne tal for spande, tømninger og sækstørrelse)
Microfibre cloths — number in circulation
Ren matematik (jeres eget forbrug og vasketid)
Cleaning schedule — time spent and staffing
Ren matematik (jeres egne tidsnormer pr. rum)
Disinfection — are you observing the contact time?
Producentdata (kontakttid fra produktets etiket/datablad)
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.