Work it out.
Calculators
VAT calculator
Procentregning · moms 25 %
VAT backwards (extract VAT)
Procentregning · 25/125 = 0,20
Contribution margin and margin ratio
Erhvervsøkonomi · DB / DG
Break-even turnover
Erhvervsøkonomi · break-even
Late payment interest
Renteloven §5 · referencesats + 8 procentpoint
Reminder fee and compensation amount (B2B)
Renteloven §9a og §9b
Holiday pay and holiday days - accrual
Ferieloven §15-16 · 12,5 %
Notice period for salaried employees
Funktionærloven §2
AM contribution and net pay from gross pay
Arbejdsmarkedsbidragsloven §1 · AM-bidrag 8 %
Tax depreciation of operating assets on the reducing balance
Afskrivningsloven §5 · maks. 25 % pr. år
Straight-line depreciation of fixed assets (accounting)
Regnskabspraksis · lineær metode
Tax-free mileage allowance
Skatterådets satser 2026
Per diem allowances on business travel (meals and accommodation)
Skatterådets satser 2026
Volumetric weight for air freight
IATA-standard · divisor 6.000
Freight tonnes in sea freight (W/M rule)
Søfragt-branchestandard · W/M (vægt/mål)
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.