Work it out.
Calculators
Occupant capacity and escape route width
BR18 (forsamlingslokaler/butik)
CCTV storage requirement
Enhedsomregning (bitrate → bytes)
Lifting limit for manual handling
AT guidance on ergonomic working environment (VEJ no. 10133 of 01/10/2026)
Rest period between two shifts
Arbejdsmiljøloven / AT-vejledning om daglig hvileperiode (5.1.1)
The 48-hour rule (average working time)
Arbejdsmiljøloven / EU-arbejdstidsdirektiv 2003/88/EF
Supplements for evening, night and Sunday/public holiday shifts
Vagttillæg — indtast din egen overenskomsts satser
Battery capacity for emergency lighting
DS/EN 1838 (nødbelysning — minimumsfunktionstid)
Number of portable fire extinguishers along a route
BR18 kap. 7 (drift, kontrol og vedligehold) / DBI-vejledning (varmt arbejde)
Number of PIR motion sensors
Producentdata (PIR-bevægelsessensor, typisk 12×12 m ved 110°)
Escape route distance — within the BR18 limit?
BR18 kap. 2 (Evakuering og redning af personer)
Time spent on a security patrol
Forholdsregning (gangfart)
Response time for callouts to an alarm
Forholdsregning (afstand/hastighed)
Radio coverage — is the distance within range?
Producentdata (PMR446, licensfri, 0,5 W)
Number of first aid kits by number of employees
ASR A4.3 (tysk arbejdsstedsregel): DIN 13157 lille, DIN 13169 stor
Number of defibrillators for full coverage
Dansk Råd for Genoplivning (Hjertesikker Zone)
Entry: time through the entrances
Guide to Safety at Sports Grounds (Green Guide), 6th edition: maximum 660 people per entrance per hour
Emptying: time through outlets
Guide to Safety at Sports Grounds (Green Guide), 6th edition: 82 people/m/min on level ground, 66 on stairs
Staffing of a fixed post
Staffing calculation: duty hours ÷ (standard time × (1 − absence))
Camera: pixels per metre and DORI
DS/EN IEC 62676-4 (DORI: 25 · 62,5 · 125 · 250 px/m)
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.