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FibreCalcs

Our Reviewers

Our reviewers independently verify that the formulas behind FibreCalcs calculators produce mathematically correct results. Each reviewer is a named academic or professional whose field matches the calculators they check — they work through the method, confirm the worked examples match the cited source, and flag anything that doesn’t add up.

Three of the twenty-two calculators on this site are currently reviewed. The other nineteen are built to the editorial policy standard — cited source, automated tests, worked examples run through real code — but have not had a second pair of eyes sign them off yet. The two reviewers listed below are mathematics academics, so they have been assigned to calculators where the maths is the substance of the page. Textile-domain calculators are waiting on reviewers with craft expertise.

Bojan Žugec

Assistant Professor of Mathematics at the Faculty of Organization and Informatics (FOI), University of Zagreb. Bojan’s research sits in probability and measure theory, which puts the mechanics of conversion and averaging calculations inside his area of work.

His review covers whether the formula implemented in code matches the formula as published, whether intermediate values are derived consistently, and whether rounding behaviour introduces error. He does not sign off on textile-domain assumptions — the decisions about usable fabric width, seam allowances, or fabric category — because those are craft judgments rather than mathematical ones. The three calculators he has checked are conversion and measurement tools where the maths carries the page.

His Google Scholar page lists his published work.

Vjeran Strahonja

Full Professor in standards and methodology at the Faculty of Organization and Informatics (FOI), University of Zagreb. Vjeran’s background is in measurement methodology — how units are defined, how calculation steps are documented, and whether a method is stated clearly enough that a reader could reproduce it by hand and reach the same answer.

He has not yet signed off on a specific calculator. His first review is queued as a second pass on the unit-conversion pages Bojan has already checked. Listing him here before that review is a matter of transparency — he is part of the programme, and the badge on his reviewed pages will appear once the review is complete.

Becoming a reviewer

Most calculators on this site are not pure maths problems. They encode decisions made by textile professionals: quilting cotton’s usable width is 42 inches because that’s what sewers actually get after the selvedge, curtain fullness is typically doubled because that’s how a workroom drapes cloth, bias binding is cut at 45 degrees because fabric stretches diagonally. Those decisions need a reviewer who has worked with the fabric, not one who only knows the maths.

I’m looking for textile professionals willing to review one or more calculators in their area. Useful backgrounds include:

Review work is unpaid. Your name and affiliation appear on the calculator pages you sign off (you can see the pattern on the pages Bojan has checked), and your profile is added to this page. Use the feedback form at the bottom of any page to get in touch — see the about page for more context on how FibreCalcs is built. Tell me which area you’d want to cover and I’ll send the current formula, cited source, and worked examples for you to check.