Sewing Calculators
Free sewing calculators: dart fitting adjustments, button spacing, elastic length, seam allowance, fabric yardage, and zipper sizing.
Fabric Yardage Calculator for Sewing
Estimate how many yards of fabric to buy for common sewing projects. Enter garment type, size, and fabric width to get the yards needed plus a cutting buffer.
Sewing Fabric Cost Calculator
Calculate the total material cost for your sewing project. Enter fabric yardage, price per yard, and optional lining fabric to get a full budget.
Sewing Pattern Grading Size Step Calculator
Calculate pattern grading increments between sizes. Get bust, waist, hip, and shoulder steps for grading patterns up or down across sizes XS to 5XL.
Bias Tape Yardage Calculator
Calculate how much fabric you need to cut bias tape or bias binding for a project. Enter the total tape length needed and finished tape width.
Garment Ease Calculator
Calculate the ease allowance to add to your body measurements for different garment types and fit preferences — from close-fitting to oversized.
Hem Allowance and Fabric Calculator
Calculate the correct hem allowance for different hem types, how much extra fabric to buy for hemming, and the finished length of your garment.
Zipper Length Calculator
Find the correct zipper length for dresses, skirts, bags, and cushions. Learn when to shorten a zipper and which zipper type to use for each application.
Fabric Shrinkage Calculator
Calculate how much extra fabric to buy before pre-washing. Enter your yardage and shrinkage percentage for cotton, wool, or linen.
Seam Allowance Converter
Convert seam allowances between millimeters and inches. Get fraction equivalents and fabric-specific advice for perfect garment construction.
Sewing Pattern Scale Calculator
Scale a sewing pattern up or down. Enter original and desired measurements to get the exact scale factor and grid instructions.
Thread Usage Calculator
Estimate how much thread you need for a sewing project. Enter seam length, number of seams, and stitch type to get total thread in yards.
Button Spacing Calculator
Calculate even button spacing for any number of buttons over a garment length. Returns exact position of each button from top and bottom in inches and cm.
Elastic Length Calculator
Calculate the unstretched elastic length needed for a waistband, cuff, or any garment opening. Avoid too-tight or too-loose results.
Sewing Dart Calculator
Calculate dart width, depth, and placement from body measurements and pattern ease. Returns intake in inches and cm for bust, waist, and shoulder darts.