Professional sewing maths · clear enough to learn fromMeasure clearly.
Measure clearly.
Cut confidently.
Clean, visual calculators that respect fabric width, construction allowances, store increments and the way sewists actually measure—in US fractions or UK/metric units.
01US fractions
02UK / metric
03Store rounding
28 ⅜ in
02UK / metric
72.1 cm
03Store rounding
2.6 m → 2.7 m
One visual language across every calculation.
Start with the answer. Open the construction detail only when you need it.
01
Fabric quantity
Six true shapes, optimised layouts, reverse yield and usable-width planning.
Open calculator →02Circle skirt
Fabric purchase, radii, fold topology, panel fallback and a separate interactive guide.
Open calculator →03Quilt binding
Perimeter, actual diagonal joins, pattern matching and crosswise strips.
Open calculator →04Bias binding
A corrected continuous-bias square that covers estimated join losses.
Open calculator →05Curtains
Drops, fullness, hems, returns, overlap, seams and pattern repeats.
Open calculator →06Print scale
Correct a PDF sewing pattern from its printed test square.
Open calculator →Understand the cloth, then trust the number.
Built for trust
The picture must agree with the number.
- 01Usable width means usable width. Selvedges stay outside the calculated cutting area.
- 02Internal precision, practical display. Full precision is preserved while measurements are presented like sewing measurements.
- 03Honest limits. Geometric planning is never presented as industrial nesting or an automatic printable pattern.