Work it out.
Calculators
Sum value for air pollution
BEK 613/2026 § 3, subsection 3 + annexes 1 and 2
The welding certificate's calendar
ISO 9606, clause 9 (DS/EN ISO 9606-1:2017)
Heat input
Formel: EN 1011-1 / ISO/TR 18491
Wire consumption (MIG/MAG)
Ren geometri + massefylde (dit input)
Gas cylinder & welding time
Boyles lov (ideal gas) — ren fysik
Carbon equivalent (CEV)
IIW-formel · ISO/TR 17671-2 metode A / DS/EN 1011-2 bilag C
Preheat temperature (CET method)
DS/EN 1011-2, bilag C (informativt) — Uwer/Degenkolbe-formlen
Fillet weld — a-dimension (rule of thumb)
⚠️ Tommelfingerregel uden fundet kilde — eftervis med DS/EN 1993-1-8
Fillet weld load capacity (simplified method)
DS/EN 1993-1-8, pkt. 4.5.3.3 (forenklet metode) — Eurocode 3
Deposited weld metal — fillet weld
Geometri (idealiseret kehlsøms-tværsnit)
V-joint — joint volume and filler material
Geometri (fugemål fra egen WPS / fugetyper i DS/EN ISO 9692-1)
Welding time — time estimate for a job
Planlægningsberegning (egen erfaring/arbejdsfaktor)
Cost per metre of weld seam
Forholdsregning (egne priser og forbrugstal)
Pipe welding — circumference and circumferential weld length
Geometri (cirkelomkreds)
Local exhaust ventilation (LEV) — required air volume
LEV-designformel (ACGIH Industrial Ventilation Manual) · BEK 581/2026 § 17 (ventilation ved farekilden)
Full-penetration butt weld — load-bearing capacity
DS/EN 1993-1-8, pkt. 4.7.1 og DS/EN 1993-1-1, pkt. 6.2 — Eurocode 3
Bent bracket
Exact flat pattern
Rectangular elbow
Exact flat pattern
Square-to-round transition
Approximate flat pattern
Flat plate, flange and blank
Exact flat pattern
Rectangular duct, straight section
Exact flat pattern
Stair stringer
Exact flat pattern
Wheel arch repair panel
Exact flat pattern
Pipe-to-square transition
Approximate flat pattern
Square tube cross
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.