Ten practical calculators

Sewing tools

Plan the cut, see the formula, and check the result before buying fabric.

Fabric planning

Cut Layout and Yardage Planner

Arrange repeated rectangular pieces and estimate how much fabric to buy.

Open cut layout planner

Rectangular Fabric Yardage Calculator

Compare both legal orientations for repeated rectangular cuts.

Open rectangle yardage

Pattern Repeat Allowance Calculator

Round panel cuts to complete pattern repeats and plan seam alignment.

Open pattern repeat

Bias Binding Calculator

Estimate strip width, joins, and fabric for straight-grain or continuous bias binding.

Open binding

Pattern math

Seam and Hem Allowance Calculator

Turn finished dimensions into cut dimensions with independent edge allowances.

Open seam and hem

Pattern Print Scale Calculator

Correct a PDF pattern when its calibration square prints at the wrong size.

Open print scale

Circle Skirt Calculator

Calculate waist and outer radii, then check a conservative fabric footprint.

Open circle skirt

Pleat and Gather Calculator

Convert finished width and fullness ratio into source width and repeat counts.

Open pleats and gathers

Home projects

Curtain Fabric Calculator

Estimate panel count, matched cut drop, and total curtain fabric.

Open curtain fabric

Cushion Cover Calculator

Plan envelope or zippered cover pieces, piping, layout, and material.

Open cushion cover