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How to calculate the fabric quantity for curtains
As an interior specialist you want a quick, reliable estimate of fabric and labour. This calculator uses the common atelier rules. Below is how it works, so you can judge the result and discuss it with your client.
Widths or railroaded
With widths (standard fabric, 140 or 150 cm) the widths are sewn together vertically to reach the height; the seams disappear into the pleats as much as possible. With railroaded (full-height fabric, 280 to 330 cm) the fabric is turned, with no vertical seams. Railroaded is calculated in running metres and is ideal for wide windows, sheers and wave.
Pleat type and fullness
The fullness sets how many times the rail width of fabric you need. Guidelines: half pleat about 1.5x, single pleat 1.8 to 2.0x, double (pinch) pleat 2.0 to 2.5x, triple pleat 2.5 to 3.0x and flat or box pleat around 3.0x. The taller the curtain, the more fullness for a nice drape. The calculator shows the fullness used.
Wave calculated separately
Wave hangs below the rail and uses carriers at a fixed cord spacing of 6 or 8 cm. The number of carriers is the rail width divided by the cord spacing, plus one, rounded to an even number so both sides fall towards the window. 6 cm gives a fuller look and more fabric than 8 cm. Wave is less suitable for blackout.
Height, hem and repeat
The cut length per width is the finished height plus a hem allowance for the top turn-over and the bottom hem. As a rule allow 25 to 30 cm; the bottom hem is often doubled to absorb shrinkage. If the fabric has a pattern, enter the repeat. The cut length is then raised per width to a whole number of repeats so the pattern lines up between widths.
Making cost
The estimated making cost is calculated per width (standard fabric) or per running metre (railroaded) and is indicative. Wave and eyelets take more labour; lining and interlining add fabric and labour. Confirm exact rates with your atelier or supplier.
Order without errors in LogicTrade
This calculator is a quick first step. In LogicTrade you compose a complete order with the connected supplier order configurator: fabric, making-up, rails and own fabrics, including automatic pattern rounding. The order flows digitally to the supplier, with current prices and no calculation errors.