Sewing Calculators

Last updated: October 2026

Fabric Yardage Calculator

Calculate the total yardage of fabric to buy for a sewing project based on project dimensions and fabric bolt width.

Calculate the total cut fabric area needed when adding seam allowances to a target finished size.

Compute the total fabric cut length needed for a garment with a chosen hem depth and a top seam allowance, so the finished length matches the design.

Find the exact batting dimensions needed for your quilt, accounting for quilting overhang and binding width.

Calculate the yardage of interfacing needed to stabilize garment pieces like collars, cuffs, and facings.

Calculates how many extra yards of fabric to purchase to account for shrinkage when pre-washing before sewing.

Compute the minimum zipper length to buy for a given opening length and zipper type, accounting for slider parking and stop placement.

Computes the cutting dimensions of a fabric piece by adding seam and hem allowances to your desired finished size.

Estimates the total thread needed, in yards, for a lockstitch seam from seam length, stitch density and a waste allowance.

Determine how much to shift each grading point on a sewing pattern when adjusting from one size to another.

Calculates the total pattern measurement — body measurement plus wearing ease and design ease — so your sewn garment fits correctly.

Compute the flat cut length of fabric needed to gather down to a target finished length, using a chosen gather ratio.

Compute the cut length of elastic for a waistband, cuff, or casing so it grips comfortably without cutting in or sliding.

Calculate the pre-gathered fabric length needed to achieve the right fullness for ruffles, skirt hems, and sleeves.

Calculate the center-to-center distance between buttonholes on a placket for evenly spaced results.

Find exactly how much fabric you need to cut continuous bias tape or binding for quilts, garments, and crafts.