Size Calculators
A precision fitting laboratory for global sizing. Our Apparel Lab decodes the confusing world of international clothing, bra, shoe, and ring sizes, converting US, UK, EU, France, Italy, Japan, and Australian scales and turning raw body measurements into a size you can actually trust before you buy. Perfect for cross-border shopping, bra fitting from a tape measure, finding your ring size at home, and avoiding costly returns.
Results stay on this device. Nothing is logged.
The tools
All client-sideConvert clothing, bra, and shoe sizes across US, UK, EU, France, Italy, Japan, and Australia. Find your size from real body measurements, calculate bra band and cup, and switch between metric and imperial — free, in your browser.
Find your ring size from finger circumference or diameter, then convert between US, UK, EU, JP, and AU. Measure at home, see a live ring preview, and copy any size — free, in your browser.
Why Size Calculators?
ToolNova's Size Calculators suite is designed for 2026 technical requirements. Unlike traditional server-side applications, every tool runs directly in your browser — your data never leaves your device.
Frequently Asked Questions
6 questionsA size number is a regional label, not a measurement. A US women's 8 is roughly a UK 12, an EU 40, and a JP 11. Our converter maps your measurement onto each region's scale so the number means the same body everywhere.
From the journal
AI ToolsBest AI Writing Assistants for Content Teams in 2025
We compared the leading AI writing assistants on editing quality, team features, and pricing to help content teams pick the right one.
How-ToHow to Choose the Right AI Image Generator
With dozens of AI image generators on the market, here is a practical framework for picking one based on your use case, budget, and rights needs.
AI ToolsTop 10 Free AI Tools You Can Start Using Today
A curated list of genuinely useful free AI tools — no credit card required — to boost writing, design, and productivity right now.