Are these calculators really free?
Yes. All 26 calculators are free, with no sign-up and no limits. The site is supported by ads.
Calculators
Ahrefs Domain Rating set in type 6 Nov 2026, reset 6 Nov 2026.

CalculateBraSize provides 26 free calculators covering bra sizing, body measurements, women's health and sewing. The site offers bra size calculations in five sizing systems (US, UK, EU, FR and AU), body shape identification, dress and shoe size converters, and pregnancy and period tracking. All calculations run privately in your browser with no sign-up required and measurements never sent to servers.
The calculators use published formulas and modern fitting methods: modern bra-fitting guidance for accurate sizing, medical formulas like Naegele's rule for pregnancy dates and Mifflin–St Jeor for calorie calculations, and standard size charts. Each tool displays its method and sources underneath. The site supports both inches and centimetres, covers band sizes from 28 to 50 and cup sizes from AA to K (UK), and includes sewing calculators for circle skirts, fabric yardage and curtain sizing.
Guides are written by editorial author Sophia Taylor and reviewed by the CalculateBraSize team. The site is funded by advertising and emphasizes that calculators provide estimates based on standard methods, not professional fitting or medical advice.
Pricing model: Free
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Ahrefs Domain Rating set in type 6 Nov 2026, reset 6 Nov 2026. Majestic set 6 Nov 2026, reset 6 Nov 2026. Link data typeset by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
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Yes. All 26 calculators are free, with no sign-up and no limits. The site is supported by ads.
No. Every calculation runs in your browser. Your measurements are not sent to the servers and are not saved.
It uses the modern method used by specialist fitters: a snug underbust rounded to the nearest even inch, and one cup letter per inch of difference. It gives a reliable starting size; brands vary, so try sister sizes when the fit is close.
Yes. Every measuring tool has an inches or centimetres switch, and the numbers you typed are converted when you switch.
No. They use published formulas like Naegele's rule for due dates and the Mifflin–St Jeor equation for calories, and are for information only. Talk to a doctor about your own health.
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