Calculator Guides

Learn the formulas and examples behind everyday calculations, then open the matching calculator when you are ready.

Tailoring

How to Take Body Measurements for Sewing

Learn how to measure chest, waist, hips, shoulders, sleeves and inseam correctly before sewing, fitting or adjusting a garment.

Finance

Learn how to add VAT to a net price, extract VAT from a gross price, and understand the formulas before using the free VAT calculator.

Mathematics

Understand percentage formulas for percent of a number, percentage change, and what percent one value is of another.

Tailoring

Understand how garment type, sleeve length, body height and fabric width affect the amount of fabric needed for sewing.

Tailoring

Learn how to move from finished garment dimensions to cutting dimensions by adding seam and hem allowance correctly.

Date & Time

Learn how age is calculated in years, months and days, including birthdays, leap years and date differences.