DIY and Building Calculators

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Guides for common jobs

• Garden landscaping project — Ten calculators that size the materials for a garden landscaping job.

Wallpaper

The wallpaper calculator works out the drops per roll from the wall height and pattern repeat, then the rolls to buy for the walls you enter, for standard, wide and US roll sizes.

Roof pitch

The roof pitch calculator converts rise and run into a pitch as x:12, degrees and percentage slope, with the multiplier that turns a plan area into the true roof area.

Stairs

The stair calculator divides a total rise into equal risers, gives the going, total run and stringer length, and checks the result against common building rules.

Rafter length

The rafter length calculator gives the common rafter length from the span and pitch, with the overhang, the rise and the plumb and seat cut angles.

Board feet

The board foot calculator totals the board feet or cubic metres in a timber order and prices it at your rate.

Screw and bolt sizes

The screw and bolt size chart gives pilot and clearance holes for wood screws, and tap drill, clearance and spanner sizes for metric and UNC bolts.

Beam load

The beam load calculator estimates the bending stress and mid-span deflection of a simply supported timber or steel beam under an even load. It is a guide only; structural work needs an engineer.

Drainage fall

The drainage fall calculator converts between fall, gradient, percentage slope and angle for drains, patios and gutters.

Pipe volume and water tanks

The pipe volume calculator gives the water held in a run of pipe and its weight, and the water tank capacity calculator gives the capacity of a round or rectangular tank and the water at any depth.

Turf

The turf calculator turns a lawn area into rolls of turf or sod pieces, pallets, weight and cost, with a waste allowance.

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