About SewCalc

SewCalc is a small, independent site with one job: getting the fabric math right so you can get on with making things.

Every calculator here follows the same rules. It shows the formula in plain language, walks through a worked example, and states its assumptions, like usable fabric widths and seam allowances, instead of hiding them. The methods are the standard ones used by quilters and curtain makers everywhere; we have just made them fast to run and hard to get wrong at midnight before a deadline.

The site is run by SmartBozo Labs, an independent studio in Mumbai, and is built and maintained with the help of AI tools, with every formula tested against worked examples before it goes live. There are no accounts, no paywalls and no pop-ups.

If a result ever disagrees with your pattern, trust the pattern, and please tell us with the feedback buttons at the bottom of any tool. Corrections and suggestions genuinely shape what gets built next. For anything longer, the contact page reaches us directly.