Fabric yardage, seam allowances, pattern grading, and workroom references. Live tools are linked first; planned tools are labeled until the calculator and supporting content are ready.
Open a live tool for calculator inputs, results, formula context, and published examples.
Choose a seam allowance for a garment and fabric, see the cloth a seam actually consumes, and convert a pattern from one allowance to another — with fractions reduced and metric paired the way patterns print it.
Grade a pattern between any two sizes from your own base measurements, with per-measurement grade rules, a wider grade above L, and the amount to slash and spread at each pattern quarter.
Convert the units a workroom actually uses: fractional inches, yards and metres, fabric weight between gsm and ounces per square yard, and iron temperatures by fibre.
Get one coherent machine setup — needle point, needle size, thread, stitch length, and tension — resolved from your fabric, its weight, and the project together.
Convert a full set of body measurements between fractional inches and centimetres, and map them onto a published size chart to see which pattern size to cut.