Around the house

How much paint a room needs, allowing for doors and windows

How many packs of flooring a room needs, including waste

Soil, compost or mulch for a bed, in litres and bags

Work out the cost of heating a home from daily kWh use and a unit rate, per day, month and year, plus what one degree on the thermostat costs

Work out annual generation from an array size, orientation and tilt, and the payback period from install cost, export rate and how much of the power is used in the home

Work out how many washing machine loads a pile of laundry needs from the drum size, and what it costs from energy and water rates

Work out the self storage unit size a list of boxes and furniture needs, in square feet and cubic metres, with the next standard size up

Work out a buildings rebuild cost and a contents cover estimate from a floor area, build type and room count, and flag any shortfall against a sum insured

Work out the boards, joists and fixings a deck needs from its dimensions, board width and gap, with a waste allowance

Work out the fabric width and drop a curtain needs from the window size and heading type, with pattern repeat and hem allowed for

Work out how many lumens a room needs from its area and use, how many bulbs that takes, and a colour temperature to match