FiberCalc
Free knitting, crochet, sewing & quilting calculators
FiberCalc estimates yarn yardage, gauge, fabric cuts, and quilt backing in your browser—no signup. Example: a 50×60″ worsted knit throw is about 1,815 yards (10 skeins at 200 yd) with the default 10% waste.
Popular tools
Blanket Yarn Calculator
Estimate skeins, yards, and grams of yarn for knit or crochet blankets by size and yarn weight.
Yarn Sweater Calculator
Estimate how much yarn you need for a sweater by size, yarn weight, and knit or crochet.
Yarn Hat Calculator
Calculate yarn yardage and skeins for knit or crochet hats by circumference and depth.
Yarn Scarf Calculator
Estimate yarn needed for scarves and wraps by dimensions and yarn weight.
Amigurumi Yarn Calculator
Estimate yarn for amigurumi projects from finished height and yarn weight.
Yarn Substitution & Weight Converter
Convert yardage between Craft Yarn Council yarn weights and grams, ounces, yards, meters.
Which calculator should I use?
Start with yarn tools for blankets, sweaters, hats, and scarves; sewing tools for fabric yardage and seams; quilting tools for size, backing, binding, and HSTs; reference charts when a ball band disagrees with your notions.
Browse by craft
Knitting & crochet
Yarn estimates, gauge, cast-on, and even shaping.
Sewing
Fabric yardage, seam allowance, and grading helpers.
Quilting
Quilt size, backing, binding, and HST cutting.
Reference
Yarn weights, quilt sizes, needle/hook converters, Aida sizing.
Guides
Deep-dive articles interlinked with every tool.
CYC yarn weights
Craft Yarn Council standards table with sources.
Start with a guide
Blanket Yarn Chart by Size
Blanket yarn chart by size using FiberCalc worsted knit density (0.55 yd/in² + 10% waste). Throw 50×60 ≈ 1,815 yd / 10 skeins at 200 yd.
Knitting Gauge Explained
Learn how to measure knitting gauge, fix mismatches, and resize stitch counts so finished width and sweater fit stay correct.
Quilt Backing Yardage Guide
Calculate quilt backing fabric with overhang, panel seams, and wide-back options. Includes a worked example and free calculator links.
Half-Square Triangle Math
HST cutting formulas for 2-, 4-, and 8-at-a-time methods, with trimming tips, a worked example, and a free HST calculator.
Yarn Substitution Basics
Substitute yarn using CYC weight, yards, and gauge—not ball counts. Checklist, worked example, and free substitution tools.
How Many Stitches to Cast On for a Hat?
Calculate hat cast-on stitches from head circumference, gauge, and ease. Worked example, tips, and free cast-on calculator.