◳ webbboxx Tools

Free online size & unit converters

Convert bra, shoe, ring and waist sizes between US, UK, EU and Japanese charts — plus everyday unit conversion. No sign-up, no install, works on any device.

01Size Charts

Bra Size Calculator Measure your band and bust to get your bra size, then convert it between US, UK, EU, French, Australian and Japanese sizing — sister sizes included. Open Shoe Size Converter Convert shoe sizes between US, UK, EU and Japanese sizing, or work them out from your foot length in centimetres, millimetres or inches. Open Waist Size Converter Convert a waist measurement between inches and centimetres, and read it as a jeans size, a US, UK or EU clothing size, and a belt length. Open Ring Size Converter Convert ring sizes between US numbers, UK letters, EU/ISO, Japanese sizes and the inside diameter or circumference in millimetres. Open

02Converters

Unit Converter Convert length, weight, area, volume, temperature and data size between metric and imperial units, with every unit in the category listed at once. Open

About webbboxx Tools

webbboxx Tools is a free collection of 5 online converters and calculators, covering size charts, converters. Everything runs in your browser — nothing to install, no account to create, and none of the numbers you type are sent to a server.

The size tools are built for international shopping, where the same body measurement is labelled four different ways. A US 34B bra is a UK 34B but a EU 75B and a French 90B; a US men's 9 shoe is a UK 8.5 and a EU 42.5; a US ring size 6 is a Japanese size 12. Each tool shows every system side by side, along with the underlying measurement in centimetres or millimetres, so you can match it against any brand's own size chart.

Categories

Frequently asked questions

Are these online tools free?

Yes, completely free. Every tool works in your browser with no sign-up, no trial period and no hidden charges.

Do I need to install anything or create an account?

No. All tools run directly in your browser. Nothing to download, nothing to register.

Is my data uploaded to a server?

No. The converters and calculators run entirely in your browser, so the numbers you type never leave your device. Any tool that does need server processing says so on its own page.

Do the tools work on a phone or tablet?

Yes. The site is responsive, so the layout and the conversion tables adapt to phone, tablet and desktop screens.

How accurate are the size conversion charts?

The charts follow the standard international conversions (US, UK, EU, JP and metric). Individual brands cut their garments differently, so treat the result as a starting point and check the brand size chart before you buy.