Work it out.
Calculators
Tightening torque & unit conversion
Enhedsdefinition: 1 ft-lb = 1,35582 N·m · Bolt-relation T = K·D·F
Engine revs at speed
Ren kinematik (gear · bagtøj · dækomkreds)
Compressed air leak test
Ren aritmetik · grænse fra syn/BEK indtastes selv
Workshop time & invoicing
Ren aritmetik · moms 25 % (gældende dansk sats)
Axle load & gross weight limits
Færdselsstyrelsen — dimensionsbekendtgørelsen (akseltryk 10.000/11.500 kg; nye totalvægte fra 1/1-2026; 7+-akslet vogntog 56.000 kg i dag, 58.000 kg fra 1/1-2027)
Braking distance from speed and deceleration
Fysik (kinematik) — reaktionstid iht. Rådet for Sikker Trafik/Vejdirektoratet; bremseforsinkelse fra bremseprøvestand
Tyre rolling circumference from tyre size
Geometri (dækindustriens ETRTO-baserede standardformel)
AdBlue consumption & range
Tommelfingerregel (branchedata: AdBlue ≈ 5 % af dieselforbruget, fx OK Erhverv/Strongblue)
Hydraulic cylinder force
Fysik (Pascals lov: F = p × A)
Battery reserve capacity
Tommelfingerregel (batteribranchen, ud fra RC-mærkeværdien testet ved 25 A, jf. IEC/EN-batteristandarder)
Alternator charge balance
Elektroteknik (strømbalance: ΣI-forbrug ≤ generatorens mærkeydelse; mærkeydelse iht. ISO 8854/SAE J56)
Compressed air receiver – filling time
Fysik/pneumatik (standard dimensioneringsmetode: fyldetid = volumen × trykstigning / kompressorens fri luftydelse)
Engine displacement
Geometri (cylindervolumen: V = π/4 × D² × L)
Belt tension – frequency method
Remspændings-frekvensmetode (branchestandard hos remproducenter, fx Gates/Optibelt/Contitech: T = m·(2·L·f)²)
Load securing – lashing force (vertical)
EN 12195-1 (lastsikring på vejkøretøjer) — forenklet lodret surrings-beregning
Bent bracket
Exact flat pattern
Part-cylindrical jacket
Exact flat pattern
Wheel arch repair panel
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.