Work it out.
Calculators
Carat, fineness and gold content
Ratio arithmetic
Casting weight – wax to metal
Massefylde (vægt = massefylde × rumfang)
Fine metal and scrap value
Procent- og forholdsregning
Ring size (ISO 8653)
ISO 8653:2016 (ringstørrelser)
Alloy calculation – mix to target carat
Massebalance (krydsmetode)
Wire length for a ring shank
Geometri (neutral-akse / middeldiameter)
Gemstone weight from dimensions (round brilliant)
GIA-vægtestimeringsformel (rund brillant)
Gilding gold consumption
FTC vermeil-standard (min. 2,5 µm) + massefylde
Chain length and weight
Geometri/vejeprincip (led × ledværdi)
Casting shrinkage – wax dimension to finished dimension
Erfaringstal (branche, cire perdue-støbning)
Density test for authenticity
Arkimedes' princip (hydrostatisk vejning)
Rolling reduction – number of passes
Erfaringstal for koldvalsning (maks. reduktion/gennemløb)
Ring size allowance for a wide shank
Branchekonvention (bredt skaft kræver større ringmål)
Legal minimum for fineness
Bekendtgørelse nr. 934/2020 + lov nr. 798/2020 om ædle metaller (Ædelmetalkontrollen)
Soldering temperature – safety window
Producentdata (loddegrad-smeltepunkter, sølvsmede-loddeguide)
Five-pointed star
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.