Seam Allowance Calculator

Calculate how to adjust a pattern piece for a new seam allowance.

1. Original Allowance

2. New Allowance

Top Sewing Picks from Amazon

Sewing Machines for Every Skill Level

Brother CS6000i Sewing Machine

Brother CS6000i Computerized Sewing and Quilting Machine

★★★★☆ (4.7/5)
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Singer Heavy Duty 4423

SINGER | Heavy Duty 4423 Sewing Machine, Gray

★★★★☆ (4.6/5)
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Janome HD3000

Janome HD3000 Heavy-Duty Sewing Machine with 18 Stitches

★★★★★ (4.8/5)
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Bernette 38

bernette b38 Swiss Design Computerized Sewing Machine

★★★★☆ (4.5/5)
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Magicfly Mini Sewing Machine

Magicfly Mini Sewing Machine for Beginners, Portable

★★★★☆ (4.1/5)
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Essential Sewing Tools & Kits

Fabric Shears

Professional Tailor's Scissors - 9 Inch Heavy Duty Fabric Shears

★★★★★ (4.9/5)
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Rotary Cutter

Fiskars 45mm Contour Rotary Cutter for Fabric and Paper

★★★★☆ (4.8/5)
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Sewing Clips

MumCraft Multipurpose Sewing Clips with Tin Box, Pack of 100

★★★★★ (4.9/5)
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Measuring Tape

Dritz 951 Soft Tape Measure, 120-Inch

★★★★☆ (4.7/5)
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Seam Ripper

Dritz Deluxe Seam Ripper with Ergonomic Handle (2-Pack)

★★★★★ (4.8/5)
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High-Quality Sewing Threads

Thread Set

Gutermann Sew-All Thread Set - 26 Spools, 110 Yards Each

★★★★★ (4.8/5)
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Thread

Coats & Clark Dual Duty XP All-purpose Thread, 250-Yard, Black

★★★★☆ (4.7/5)
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Cotton Thread

Aurifil Mako 50wt Cotton Thread - Large Spool, Neutral Colors

★★★★★ (4.9/5)
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Embroidery Thread

New Brothread 63 Brother Colors Polyester Embroidery Machine Thread Kit

★★★★☆ (4.8/5)
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Serger Thread

Maxi-Lock Serger Thread Cone, 3000-Yard, White

★★★★☆ (4.8/5)
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Fabric & Cutting Mats

Cutting Mat

OLFA 24" x 36" Double-Sided Self-Healing Rotary Mat

★★★★★ (4.9/5)
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Fabric Squares

Fat Quarter Fabric Bundles - 100% Cotton, 7pcs Floral Prints

★★★★☆ (4.6/5)
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Acrylic Ruler

Omnigrid 6 x 24 Inch Quilter's Ruler with Non-Slip Backing

★★★★★ (4.9/5)
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Fabric Markers

Dritz Mark-B-Gone Marking Pen, Blue (Water Soluble Ink)

★★★★☆ (4.6/5)
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Fusible Interfacing

Pellon 911FF Fusible Featherweight Interfacing, 20" x 10 Yards

★★★★☆ (4.8/5)
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Sewing Storage & Organization

Sewing Basket

Dritz St. Jane Sewing Basket with Sewing Notions Kit

★★★★☆ (4.7/5)
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Thread Rack

June Tailor Mega-Rak II Thread Rack, Holds 120 Spools

★★★★☆ (4.7/5)
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Rolling Tote

Everything Mary Deluxe Rolling Sewing Machine Tote

★★★★★ (4.8/5)
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Bobbin Box

ArtBin Bobbin Box, Clear - Holds up to 50 Bobbins

★★★★☆ (4.8/5)
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Scissor Case

Embroidex 30-Spool Thread Stand and Scissor Storage

★★★★☆ (4.6/5)
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