Sewing Calculators
Applique Fusible Web Calculator
Calculate total fusible web area needed for an applique project based on shape areas and a waste factor for tracing and cutting.
Bias Tape Length Calculator
Calculate how much bias tape you need to bind an edge based on the edge perimeter and overlap allowance.
Bobbin Thread Capacity Calculator
Calculate how many bobbins of thread are needed for a sewing project based on seam length and number of seams.
Buttonhole Spacing Calculator
Calculate even spacing between buttonhole centers along a garment placket based on total length and number of buttonholes.
Elastic Cut Length Calculator
Calculate the elastic length to cut based on a body measurement and a reduction percentage for a snug fit.
Fabric Shrinkage Calculator
Calculate fabric shrinkage percentage from a test swatch and the adjusted cut length needed to hit your desired finished size.
Fabric Yardage Calculator
Calculate how many yards of fabric to buy based on piece dimensions, quantity needed, seam allowance, and fabric bolt width.
Garment Ease Calculator
Calculate the finished garment measurement by adding the appropriate ease amount to a body measurement based on desired fit.
Gathering/Ruffle Ratio Calculator
Calculate how much flat fabric you need to gather down to a desired finished ruffle length using a gather ratio.
Hem Allowance Calculator
Calculate the total fabric cut length needed to achieve a desired finished hem length, for single-fold or double-fold hems.
Interfacing Yardage Calculator
Calculate total interfacing yardage needed for a sewing project based on the lengths of pattern pieces requiring interfacing.
Pattern Scaling Calculator
Calculate a new measurement when scaling a sewing pattern up or down by a percentage.
Piping Cord Length Calculator
Calculate the total piping cord and bias strip length needed for a seam, including allowance for joining and easing around curves.
Pleat Fabric Requirement Calculator
Calculate the total fabric width needed for a pleated garment or curtain based on finished width, pleat depth, and number of pleats.
Quilt Batting Calculator
Calculate the batting and backing size needed for a quilt based on the quilt top dimensions and overhang margin.
Quilt Binding Length Calculator
Calculate the total length of binding fabric needed for a quilt based on its dimensions, including allowance for corners and joining.
Quilt Block Count Calculator
Calculate the total number of quilt blocks needed to cover a finished quilt top based on quilt dimensions and block size.
Seam Allowance Calculator
Calculate the actual cut size of a fabric piece by adding seam allowance to a finished measurement.
Thread Length Estimator
Estimate how much sewing thread you'll need for a project based on total seam length and a thread usage multiplier.
Zipper Length Calculator
Calculate what length zipper to buy based on your finished opening length and installation allowance.
Measure Twice, Cut Fabric Once
Fabric is one of the more expensive parts of a sewing project to get wrong — buying too little means a scramble to match dye lots later, buying too much wastes money on excess yardage. These ten calculators cover fabric and notion quantity math.
Estimating Total Fabric Yardage, Step by Step
- Start with the pattern's stated yardage requirement for your size and the fabric width it assumes.
- Adjust for seam allowance. Most patterns already include a standard seam allowance (often ⅝ inch), but confirm this rather than assuming.
- Add a shrinkage buffer if pre-washing. Natural fibers like cotton can shrink 3-5% after the first wash, which the Fabric Shrinkage Calculator accounts for before cutting.
- Round up, not down. Directional prints, plaids requiring pattern matching, or simple cutting mistakes all eat into fabric faster than a flat calculation assumes — a little extra is far cheaper than running short mid-project.
Run the full calculation with the Fabric Yardage Calculator.
Popular Sewing Calculators
- Bias Tape Length Calculator — calculates fabric needed for continuous bias tape from strip width and finished length.
- Quilt Batting Calculator — calculates batting size needed for a given quilt top dimension.
- Seam Allowance Calculator — converts between common seam allowance widths and adjusts pattern pieces accordingly.
Related: Textile Calculators for fabric-production-side math.