Fabric, yarn and quilting arithmetic for sewing, knitting and soft furnishings.
Calculators for the cutting table and the needle: how much fabric a pattern or a set of curtains needs, how a quilt’s blocks, borders and binding add up, how far a yarn goes and how a gauge swatch changes a pattern. Each one states its formula and the allowances it assumes — seam, shrinkage, repeat, fullness — as inputs you can change, so the number matches your fabric and your pattern rather than a default.
Bias binding length from a rectangle, circle or measured edge, the strip width for single or double-fold tape, and the square that yields it as continuous bias.
You get: How much binding an edge needs with your overlap, the strip width your tape size implies, the side of the square for the continuous-bias method, and the fabric to buy from your bolt width.
Open Bias Binding & Continuous BiasWaist and outer radius for a full, ¾, half or quarter circle skirt from your waist, ease, length and hem, and the fabric it takes cut in one piece or wedges.
You get: The radius to mark at the waist (with the seam taken off), the outer radius, each wedge’s angle and cut size, and the fabric length from your fabric width — geometry only, every allowance yours.
Open Circle Skirt PatternCurtain fabric from the track width, fullness, panels and finished drop: whole widths, cut drops rounded to the pattern repeat, and lining when you want it.
You get: How many fabric widths the curtains need at the fullness you choose, the cut drop with heading, hem and repeat, the total yards or metres, and the same for lining — every allowance entered by you.
Open Curtain Fabric CalculatorFabric length for a list of pattern pieces with seam allowance, laid in rows across your fabric width; repeat, shrinkage and extra are inputs, not assumptions.
You get: Yards or metres to buy for the pieces you list, the row-by-row layout that explains the number, the unused share, and what a pattern repeat, pre-wash shrinkage and a margin of your choosing add.
Open Fabric Yardage from Pattern PiecesCut square sizes for half-square triangles two, four or eight at a time and for quarter-square units, from the finished size and your seam allowance, in or cm.
You get: The starting square for the method you use, rounded up to your step, the unfinished size to trim to, how many squares of each fabric a count of units needs, and all four methods side by side.
Open Half-Square Triangle Cut SizeBacking and batting size from the quilt top and your overhang, and the fabric to buy: whole widths with seams along or across the quilt, whichever takes less.
You get: The backing and batting dimensions, how many panels your fabric width needs and which way the seams should run for the least fabric, the yards or metres to buy, and the unused share.
Open Quilt Backing & BattingQuilt binding length from the quilt size plus your overlap, the strips to cut at your strip width and join allowance, and the yardage — straight or bias.
You get: How long the binding must be, how many strips of your width the fabric yields once each diagonal join is allowed for, the fabric to buy, and the square a bias binding needs instead.
Open Quilt BindingFinished quilt size from the centre and up to four borders, the strip lengths and cut widths for each, strips per border from your fabric width, and yardage.
You get: The size after each border and the final size, side and top strip lengths for butted or mitred corners, strips cut across or along the grain, fabric per border and in all, and the gap to a target size you enter.
Open Quilt Borders & Finished SizeWhat your swatch gauge does to a pattern: the size its cast-on and rows come out at, the counts that keep its size, and stitches and rows for a size you want.
You get: The stitch and row factors between your swatch and the pattern, the width and length the pattern’s counts give at your gauge, adjusted cast-on and row counts, and counts for a target width and length.
Open Knitting Gauge ConverterSkeins to buy from what a pattern asks for — a length, a weight or skeins of its yarn — with your margin, and how a substitute yarn compares by length per gram.
You get: The yarn length and weight the project needs including your margin, the skeins of the yarn on your label and what is left over, and for a substitute its skeins, weight and how its length per gram compares.
Open Yarn Requirement & SubstitutionFinished size of a cross stitch chart at any fabric count, over one or two, the fabric to cut with your margin, and the same chart on a second count.
You get: The stitched area of a chart in inches or centimetres at your count, the cut size with the margin you allow on each side, the stitch total, and the same chart’s size on another count.
Open Cross Stitch Fabric & Size