Sewing Tools & Calculators
Free, practical calculators for garment sewing and haberdashery — convert fabric yardage, size seam allowances, cut bias tape, budget trim and ribbon, scale a pattern, and estimate thread.
Fabric Yardage Calculator
Convert a pattern's stated yardage to the fabric width you're actually buying, and add allowances for napped fabric and print-repeat matching
Seam Allowance Calculator
Work out a piece's cut size from its finished size, seam allowance, and seam finish — standard, French, flat-felled, or overlocked — plus the total cut length with a hem
Bias Tape Length Calculator
Size the binding for an edge, work out the fabric square the continuous-bias method needs, or check the tape a square you already have will yield
Trim & Ribbon Quantity Calculator
Multiply a per-piece trim length across every item you're decorating, add a buffer for corners and mis-cuts, and see the total in inches, yards, meters, and spools
Pattern Scaling Calculator
Find the exact scale factor and copier/PDF percentage to enlarge or reduce a pattern to your own measurements — and see what should stay fixed
Thread Consumption Estimator
Estimate total thread from your seam lengths and stitch type — lockstitch, chainstitch, overlock, or coverstitch — plus how many spools to buy