Work it out.
Calculators
Resolution & print size
DPI (dots per inch)
Grammage and sheet weight
Gramvægt-definition (g/m²)
Bleed and gross format
Branchestandard beskæring 3 mm (jf. ISO 217 råformater RA/SRA)
Raw image file size
Bitdybde × pixelantal (branche-tommelfingerregel for ukomprimeret billeddata)
Point, pica and millimetre
DTP-punkt = 1/72 tomme (PostScript-punktsystemet, Adobe)
Number up per press sheet
Forholdsregning (arkudnyttelse/montage)
Total area coverage (TAC)
ISO 12647-2 / FOGRA-karakteriseringsdata (vejledende TAC-grænser pr. papirtype)
Pixel size on screen in physical dimensions
PPI-definition (pixels per inch)
The golden ratio in layout
Geometri (matematisk konstant φ = (1+√5)/2 ≈ 1,618)
Contrast ratio (WCAG)
WCAG 2.1, SC 1.4.3 (relativ luminans-formel)
Line spacing (leading)
Typografisk tommelfingerregel (120–150 % af skriftstørrelsen) + WCAG 1.4.8
Video file size based on bitrate
Bitrate × varighed (YouTubes anbefalede upload-bitrater som referenceramme)
Print price per unit and for the run
Forholdsregning (prisopbygning i tryksager)
Crop ratios for social media
Platformenes officielle anbefalede billedformater (Meta/Instagram, 2026)
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.