Construction Formula

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Before reading this article, ensure you have read Measurement - Parts & Labour and Using Formula within Groundplan articles to aid in understanding the following Formula examples.

📝 The Formula values provided in this article are for example purposes only.

Term	Explained
`count`	total counts
`len`	total metres measured
`area`	total square metres measured
`count, len or area / x`	total count/length/area divided by an `amount`
*`count, len or area x`**	total count/length/area multiplied by an `amount`
*`+ len x`**	add the perimetre of the area drawn multiplied by an `amount`
`ceil(x)`	rounding up a decimal value to the next whole number

Internal Door

Measurement Part Formula examples to calculate a 2040mm x 820mm x 35mm internal door using a Count Measurement:

Part	Explanation	Formula	UMO
Internal Door 2040mm x 820mm x 35mm	`Doors` counted	`count`	each
Gainsborough G3 series satin chrome	`Handles` required	`count`	each
Hinges	`Number` of hinges required for `3 hinges` per door	*`count3`**	each
Rebated door jamb (5.4m length)	Number of `5.4 lengths` required for each door	`count`	lengths
Bevelled edge architrave 42mm x 11mm (5.4m length)	Number of `5.4 lengths` required for `each side of the door`	*`count2`**	lengths

Example Parts for frame including bottom, top and ribbon plates, noggins and studs @450mm spacing (2.4m lengths) Length Measurement:

Part	Explanation	Formula	UMO
MGP 10 Framing pine H2 90mm x 35mm (2.4m lengths)	The total length measured divided by `lengths of 2.4m` multipled by *`4` for bottom plate, noggins, top and ribbon plates, added to the total length measured divided by `studs every 450mm`**	*`(len/2.44) + (len/0.45)`**	lengths

Example Parts for Primeline Newport 4200mm x 170mm x 9mm Area Measurement:

Part	Explanation	Formula	UMO
Primeline Newport 4200mm x 170mm x 9mm (0.588m2 coverage)	Total area measured after doors and windows were removed divided by `0.588m2 of board coverage`	`ceil(area/0.588)`	boards

Example Parts for standard brickwork Area Measurement:

Part	Explanation	Formula	UMO
Brickwork Standard	`Area` of brickwork required after windows and doors were removed	`area`	m2
Bricks	How many `bricks` are required after windows and doors were removed when `50 bricks` fit into an average m2 and allow for `10% wastage`	*`ceil(area501.10)`*	each

Example Parts for a 150mm thickness concrete Area Measurement:

Part	Explanation	Formula	UMO
Concrete 150mm	How much m3 of concrete is required for `150mm thickness`	*`area0.15`**	m3
Formwork	How many metres of formwork is required for the `perimeter around the area` measured	`len`	m
Steel mesh 4.56m x 1.97m (7.5m2 coverage)	How many `7.5m2 coverage` sheets are required for the area measured	`ceil(area/7.5)`	sheets
Bar chairs (pk500)	How many chairs are required to support the steel mesh with `4 per m2` and come in a `bag of 500`	*`ceil(area4/500)`**	bags

Example Parts for a strip footings Length Measurement:

Part	Explanation	Formula	UMO
Trench	How many cubic metres required for the total length measured multiplied by `450mm width` multiplied by `450mm depth` and allow for `10% expansion`	*`(len0.450.45)1.10`**	m3
Concrete	How many cubic metres required for the total length measured multiplied by `450mm width` multiplied by `450mm depth` and allow for `10% expansion`	*`(len0.450.45)1.10`**	m3

Example Parts for a Kwila Decking 90mm x 19mm (including 5mm gaps) Area Measurement:

Part	Explanation	Formula	UMO
Kwila Decking 90mm x 19mm	How many `metres` of decking boards are required when `10.52m` covers 1 m2 with 5mm gaps and allow for `10% wastage`	*`(area10.52m)1.10`*	m

Example Parts for a waterproofing Area Measurement:

Part	Explanation	Formula	UMO
Wet Areas	Total `area` measured	`area`	m2
Primer	How many `Litres` are required for the area measured plus `100mm` up the wall around the perimetre of the area divided by an average of `1 litre based on covering 6m2`	*`(area+len0.1)/6`**	Litres
WP Membrane	How many `Litres` are required for the area measured plus `100mm` up the wall around the perimetre of the area divided by an average of `1 litre based on covering 1.5m2` multiplied by `2 coats`	*`(area+len0.1)/1.52`*	Litres

Example Parts for Limestone porcelain 600mm x 600mm floor tiles Area Measurement:

Part	Explanation	Formula	UMO
Limestone porcelain 600mm x 600mm floor tiles	`Area` of tiles required after cabinets and islands benches were removed	`area`	m2
Limestone porcelain boxes	How many `boxes` are required when a box covers `1.44m2` and allowing for `20% wastage`	*`ceil(area/1.441.20)`**	boxes

Part	Explanation	Formula	UMO
Subway grey wall tiles 100 x 200mm	How many m2 of tiles are required when the tiles are `600mm` up the wall	*`len0.60`**	m2
Subway grey boxes	How many `boxes` are required for the total length multiplied by `600mm` up the wall when a box covers `1.14m2` and allowing for `10% wastage`	*`ceil((len0.6/1.14)1.10)`*	boxes