Work it out.

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.