Sewing & embroidery calculators
Every tool on Bobbin & Form, grouped the way you actually work. Search by task or filter by category — 63 calculators are ready now and the rest are rolling out.
Fabric & Yardage
14 toolsFabric Yardage Calculator
Know exactly how much fabric your pattern needs.
Use ToolFabric Shrinkage Predictor
Predict post-wash shrinkage before you cut.
Use ToolBias Tape Width & Length
Size a fabric square for continuous bias binding.
Use ToolCurtain Fabric & Fullness
Work out panel width and pleats for drapes.
Use ToolUpholstery Fabric Yardage
Estimate cloth needed to recover a chair or sofa.
Use ToolDress / Garment Yardage
How much fabric a dress, by silhouette and length.
Use ToolFabric Cost & Budget
Total project cost with waste, trim and tax.
Use ToolFabric Unit Converter
Yard, metre and inch conversions with shop rounding.
Use ToolTote & Bag Fabric Calculator
Body, gusset, straps and lining cut sizes.
Use ToolFabric Roll Length
How many yards are left on a partial roll.
Use ToolCurtain Panel Size
Per-panel cut width and drop with headings.
Use ToolFabric Weight (GSM ↔ oz/yd²)
Convert fabric weight between metric and imperial.
Use ToolInterfacing Yardage
Fusible and sew-in interfacing at narrow widths.
Use ToolPattern-Matching Yardage
Add repeat allowance for stripes and plaids.
Use ToolEmbroidery & Hoops
12 toolsHoop & Design Fit
Check your design fits before you start stitching.
Use ToolStitch Density (FSP) Calc
Calculate stitches per square inch for crisp embroidery.
Use ToolEmbroidery Stitch Count Estimator
Estimate total stitches for a design by size and density.
Use ToolDesign Scaling / Resize %
Resize a design and see the density impact.
Use ToolThread Consumption (per 1,000)
Top and bobbin thread needed for a stitch count.
Use ToolBobbin Winding Time
Estimate winding time for a full project of bobbins.
Use ToolHoop Tension & Fabric Stretch
Match stabilizer weight to fabric stretch for hooping.
Use ToolDesign Placement & Centering
Map chest, cap-sleeve and kids' placement offsets.
Use ToolEmbroidery Pricing & Profit
Price a job from stitches, colors, runtime and cost.
Use ToolDesign Run-Time Estimator
Minutes per design from stitches and color changes.
Use ToolThread Run-Out Check
Will your cone or bobbin last the whole design?
Use ToolStabilizer Cut-Size for Hoop
Cut stabilizer the right size for your hoop.
Use ToolThread & Needles
8 toolsThread Count Converter
Translate fabric and thread counts in one tap.
Use ToolStitch Length Advisor
Dial in the right stitch length for any fabric weight.
Use ToolNeedle Size Converter (US ↔ EU)
Map needle sizes to fabric weight across systems.
Use ToolThread Weight System Converter
Tex, ticket, denier and number-count conversions.
Use ToolWPI → Yarn/Thread Weight
Turn wraps-per-inch into a standard weight class.
Use ToolSPI / Stitches-Per-Inch Checker
Count-gauge helper with mm conversions and tension tips.
Use ToolNeedle-to-Fabric Matrix
Pick point, size and thread for any fabric.
Use ToolYarn Count Converter (Ne/Nm/Tex)
Industrial indirect-to-direct yarn count conversions.
Use ToolGarment Fitting
11 toolsBody Measurement & Size Selector
Match bust, waist and hip to pattern size charts.
Use ToolEase Allowance Calculator
Add wearing and design ease by garment type.
Use ToolElastic Length Calculator
Cut elastic for a snug, comfortable waistband or cuff.
Use ToolCircle Skirt & Waist Radius
Radius, hem sweep and yardage for circle skirts.
Use ToolButtonhole Size
Size a buttonhole from button diameter and thickness.
Use ToolPattern Piece Scaling
Scale a pattern piece up or down with SA add-back.
Use ToolFull / Small Bust Adjustment
Turn high-bust vs full-bust into a pattern change.
Use ToolDress Size & Brand Converter
US ↔ UK ↔ EU sizes across major pattern brands.
Use ToolPleated Skirt Calculator
Fabric width and pleat spacing by pleat style.
Use ToolSleeve Cap Ease
Set a sleeve by calculating cap ease against the armscye.
Use ToolKnit Stretch / Negative Ease
Measure fabric stretch and size knit patterns with negative ease.
Use ToolQuilting & Piecing
11 toolsQuilt Block Size
Cut sizes for finished units, on-point and setting triangles.
Use ToolQuilt Binding Length
Binding strips and yardage from quilt dimensions.
Use ToolSashing & Border Width
Inner and outer border maths for block quilts.
Use ToolQuilt Batting Size
Batting dimensions with quilting shrink allowance.
Use ToolHalf-Square Triangle (HST) Math
Starting square size for finished HST units.
Use ToolQuilt Size by Block Count
Finished size from block count, sashing and borders.
Use ToolFabric Scraps / Improv Picker
How many blocks your scrap stash can yield.
Use ToolQuilt Backing Yardage
Backing fabric with overhang and seam-layout options.
Use ToolHexagon Quilt Calculator
Hex counts per row and cut size by piecing method.
Use ToolFat Quarter Piece Count
How many pieces a fat quarter or fat eighth yields.
Use ToolOn-Point / Diagonal Layout
Quilt size and setting triangles for on-point blocks.
Use ToolCare & Prep
7 toolsPre-Wash Shrinkage Planner
Plan cut sizes around expected first-wash shrink.
Use ToolStabilizer Choice Guide
Cutaway, tearaway or wash-away for your fabric and design.
Use ToolSeam Allowance Converter
Quick imperial ↔ metric seam-allowance conversions.
Use ToolIron Temperature & Fabric Care
Recommended heat and steam by fiber content.
Use ToolFabric Storage & Folding
Shelf units needed for a folded yardage stash.
Use ToolCross-Stitch Floss Conversion
DMC ↔ Anchor ↔ Madeira colour-number lookups.
Use ToolCross-Stitch Fabric Size
Finished size from stitch count and fabric count.
Use Tool