Work it out.
Calculators
Daily feed quantity
Ren matematik — du indtaster selv tallene fra foderposen/foderplanen
Medication dosing by weight
Ren matematik — du indtaster dyrlægens ordination og præparatets styrke
Area and surfacing in an enclosure
Ren geometri — du indtaster selv kravet til areal pr. dyr
Mixing and dilution
Ren matematik — du indtaster selv blandingsforholdet fra produktets vejledning
Daily energy requirement by Kleiber's law
Kleibers lov (biologisk skalering) — brugt i zoologisk/veterinær fodringsplanlægning
Horse stable — minimum area by height at the withers
Bekendtgørelse nr. 1746 af 30/11/2020 om velfærdsmæssige mindstekrav til hold af heste
Rabbit cage for laboratory animals — minimum area (ETS 123, Appendix A)
Europarådets konvention ETS 123, bilag A (revideret 2006) — forsøgsdyrsanlæg
Terrarium — UV-B distance by Ferguson zone
Ferguson-zoner (Ferguson et al., 2010) + omvendt kvadrat-lov for UV-stråling
Aquarium — fish stocking by the litre rule
Erfaringsregel (akvaristik) — ikke en biologisk eller lovmæssig standard
Aquarium — required filter capacity (turnover per hour)
Brancheanbefaling (akvarie-filterproducenter)
Animal transport — driving time and statutory rest
Forordning (EF) nr. 1/2005, bilag I, kapitel V, punkt 1.4-1.5
Hen house — space requirement per hen
Rådets direktiv 1999/74/EF om mindstekrav til beskyttelse af æglæggende høner
A dog's daily water requirement (rule of thumb)
Veterinærfaglig tommelfingerregel (ca. 50 ml/kg/dag, danske dyrlægekilder)
Feed cost per day, month and year
Ren matematik — du indtaster selv dagsration og foderpris
Pool/pond — water volume
Geometry (volume)
Horse's weight from tape measure
Carroll & Huntington 1988 (Equine Veterinary Journal 20: 41-45): kg = chest circumference² × length ÷ 11,880
Roughage for horse after dry matter
NRC 2007 Nutrient Requirements of Horses + Nordic recommendations: at least 1.5 kg forage dry matter per 100 kg (1.0 kg is the floor limit)
Medicine in drinking water
Standard conversion for medication via drinking water (e.g. Turner et al. 2011, JAALAS 50: 600-613): mg/l = dose × weight ÷ water intake
Effective population size and inbreeding
Falconer & Mackay 1996 (Ne = 4·Nm·Nf ÷ (Nm + Nf), ΔF = 1 ÷ 2Ne); FAO: ΔF maximum 1 % per generation
Funnel and hopper
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.