Bra Size Converter — Free Online Tool

US, UK, EU, FR/BE, IT, AU/NZ.. Bra Size Converter is a free online tool from the ToolsRift Special Unit Converters collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.

Loading Bra Size Converter…

How to use Bra Size Converter

Enter your US band number and select a cup letter. The tool applies each system's band formula and shows matching sizes side by side.

Frequently asked questions

How is EU band size calculated?

EU band ≈ US × 2.25 + 10, mapping the inch-based US band to the centimetre EU scale.

How do FR and BE sizes relate to EU?

French and Belgian band sizes are EU + 15, a fixed offset shown automatically.

Are cup letters the same everywhere?

Cup lettering varies by country and brand, so treat cup output as an approximate guide.

More Special Unit Converters

Paper Size Converter

A/B + US sizes, dimensions + visuals.

Typography Converter

pt, px, em, rem, mm, cm by DPI.

Frequency ↔ Wavelength Converter

Convert between frequency (Hz, kHz, MHz, GHz) and electromagnetic wavelength using λ = c/f with the exact speed of light.

Data Transfer Rate Converter

Convert bit/s, kbit/s, Mbit/s, Gbit/s and byte-based KB/s, MB/s, GB/s using SI decimal prefixes and the 8-bits-per-byte relation.

Angle Unit Converter

Convert degrees, radians, gradians, arcminutes, arcseconds and turns for geometry, trigonometry and navigation.

Tire Pressure Converter

Convert tire and general pressure between PSI, bar, kPa, atmospheres and mmHg (torr).

← View all Special Unit Converters