Work it out.
Calculators
2-stroke mixing ratio
Ratio arithmetic
Antifouling consumption
Geometry
Battery bank size
Elektriske anlæg
Hull speed (displacement speed)
Skrogfart-formlen (bølgeteori for deplacementskrog)
Planing speed (Crouch's formula)
Crouch's formel (empirisk søfarts-standard for planende skrog, G. Crouch 1930'erne)
Propeller slip
Standard propel-slip-formel (marine fremdriftsberegning)
Anchor line length (scope)
BoatUS Foundation-forholdsregel for scope (rode-forhold)
Anchor chain size
Germanischer Lloyd-anbefaling for ankerkæde (klassifikationsselskab)
Mooring line size
Tommelfingerregel for fortøjningstov (bådudstyrsbranchen, fx West Marine)
Fender size and number
Fenderfabrikanters tommelfingerregel (fx Polyform) for LOA → diameter
Fuel consumption and range
Tredjedelsreglen for brændstofplanlægning (søsikkerhedsregel)
Voltage drop in a 12/24V cable
ABYC E-11 (spændingsfald, elektriske anlæg på både)
Sacrificial anode sizing
1%-reglen for anodeareal (galvanisk korrosionsbeskyttelse, branche-/ABYC-praksis)
Battery charging time (bulk + absorption)
Ladevejledning for bly-/VRLA-batterier (bulk-strøm + CD Technologies absorptionsformel)
Legal combination weight with a boat trailer (category B licence)
Færdselsstyrelsens kørekortregler for kategori B (kørekortbekendtgørelsen)
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.