Storage Volume Calculator
The volume of a storage space is not the volume you can use, and the gap between the two is larger than people expect. Boxes are rectangular and rooms have doors, but more importantly boxes cannot be stacked floor to…
Tool Category Space & Layout
Space and layout calculators for inside the house: what fits through the door, how big a rug or table a room can take, how much storage a cupboard really holds, how many people a room seats, and how to light and cool it. Space and Layout Calculators.
AC Size Calculator
An air conditioner that is too small never quite gets there; one that is too large short-cycles, leaves the room clammy and costs more to run than a correctly sized unit. Sizing is mostly arithmetic about the room: how big…
Lighting Lumens Calculator
Buying lights by wattage stopped meaning anything the day LED arrived, and the number on the box now tells you what the fitting produces rather than what the room receives. Most rooms are dim not because the bulbs are weak…
Room Volume Calculator
Floor area is the number everybody knows about their rooms and it is the wrong one for almost everything except flooring. What a room does – how much air it holds, how much of it you are conditioning, how long…
Artwork Height Calculator
Pictures are hung by the centre and measured by the eye, and the two rules that matter are that the centre should sit close to eye level and that whatever is below the frame gets a deliberate gap rather than…
Shelf Spacing Calculator
Shelf spacing is a subtraction that people forget to do. The shelves themselves are solid, so five 18 mm boards in a two-metre opening take ninety millimetres of it before a single thing is stored — and what is left…
Rug Size Calculator
Almost every rug that looks wrong is the wrong size, and it is nearly always too small. The reason is that people size a rug against the room, when it should be sized against the furniture sitting on it —…
Pendant Light Size Calculator
A pendant over a table is sized off the table and hung off the ceiling, and the two are independent. The size rule is that the shade should be somewhere between a half and two-thirds of the short side of…
Dining Table Size Calculator
A dining table is sized by its edge, not by its area, because people sit around the perimeter and each of them needs a share of it — about sixty centimetres to eat comfortably, and a bit more if the…
TV Size Calculator
The size of television to buy is not a matter of taste; it is geometry. Sit at a fixed distance and there is a screen size that fills the comfortable field of view and a larger one that starts to…