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RingSizeCharts
Measure your ring size at home: US, UK, EU, Japan, China.
Measure your ring size in 2 minutes with a string, a ring you already own, or your screen. Get US, UK, EU, Japan and China sizes at once, in mm and inches. What's different: it follows ISO 8653:2016, converts both ways, adds a full half-size chart plus guides on temperature and band width, and runs entirely in your browser - no install, no account, nothing uploaded. Free, nine languages, six ring styles.
Hey Product Hunt 👋
I built RingSizeCharts because I did the thing everyone does: ordered a ring online, guessed the size, and got it wrong.
Size charts already exist. The problem is they're scattered, they contradict each other, and half of them assume you own a jeweller's sizer.
So the tool does three things:
📏 Measure with nothing — a string, a strip of paper, or the inner diameter of a ring you already own. Plus a printable sizer at 100% scale.
🌍 Convert once — one measurement gives you US, UK, EU, Japan and China sizes together, in mm and inches, in both directions.
📖 Understand the gap — a full half-size chart, plus notes on how temperature and band width change the size you need.
It started as a bare converter: one input, one number. But the questions people actually asked weren't about the number. They were "am I measuring this right?", "why is my size different in winter?". So it grew into a reference - the guides, the chart, the notes. Then I added the style collections, because the other half of the decision isn't the size, it's which ring.
Three things I care about: nothing is uploaded (it all runs in your browser), it follows ISO 8653:2016, and it's in nine languages. Free, no sign-up.
Two questions I'd love your take on:
1. Is there a size standard or region you'd want covered that isn't there yet?
2. If you've bought a ring online, what made the size feel risky?
Thanks for taking a look 🙏
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About RingSizeCharts on Product Hunt
“Measure your ring size at home: US, UK, EU, Japan, China.”
RingSizeCharts was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #146 on the daily leaderboard. Measure your ring size in 2 minutes with a string, a ring you already own, or your screen. Get US, UK, EU, Japan and China sizes at once, in mm and inches. What's different: it follows ISO 8653:2016, converts both ways, adds a full half-size chart plus guides on temperature and band width, and runs entirely in your browser - no install, no account, nothing uploaded. Free, nine languages, six ring styles.
RingSizeCharts was featured in E-Commerce (42k followers), Lifestyle (1.8k followers) and Shopping (1.6k followers) on Product Hunt. Together, these topics include over 27k products, making this a competitive space to launch in.
Who hunted RingSizeCharts?
RingSizeCharts was hunted by HUANGLUYI. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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