Know your size before you buy. This adjustable ring sizer is a simple, reusable tool that measures any finger accurately at home in US sizes 1–17, including half sizes — so you order your engagement ring, wedding band, or gift with confidence and skip the guesswork. US sizes 1–17 Half sizes included Reusable & adjustable Measures any finger Easy at-home use A reliable ring sizer tool for accurate at-home measuring Buying a ring you can’t try on first is where most sizing mistakes happen. This ring size measurer takes the uncertainty out of it. The flexible band wraps around your finger, threads through the buckle, and shows your exact size on a clearly marked scale — the same US sizing every Aquamarise® ring is built to. It’s the easiest way to confirm your size at home without a trip to a jeweler. How to use your ring sizer Slip the pointed end of the band through the buckle to form a loop. Slide the loop over your knuckle and down to the base of your finger. Gently tighten until it fits snugly but still slides over the knuckle. Read the number at the buckle — that’s your US ring size. Loosen the band to release it. Because it’s fully reusable, you can measure every finger and re-check any time. For the truest fit, measure at the end of the day when fingers are at their largest, and take a couple of readings. If you land between two sizes, we recommend sizing up. Perfect for a surprise proposal Planning a proposal and need a size without giving it away? This adjustable ring sizer is discreet enough to slip into a moment together, or you can compare it against a ring they already wear — lay one of their rings against the band and match the measurement. Pair it with our complete ring size guide for extra tips on measuring someone else’s finger. Specifications Type Adjustable finger & ring sizer tool Sizing US sizes 1–17, including all half sizes Reusable Yes — measure any finger, any time Best for Engagement rings, wedding bands, gifts, surprise proposals Shipping Sent via standard mail; please allow 1–2 weeks for delivery Returns Final sale Prefer to measure right now? You can also size at home for free using our printable and on-screen ring sizer. Once you know your size, explore our engagement rings and wedding bands — every piece is made to true US sizing, so the number you measure here is the size you order. Frequently Asked Questions What is a ring sizer and how does it work? A ring sizer is a small tool used to measure your finger so you can order a ring that fits. This adjustable version has a flexible band that loops through a buckle. You slide it over your finger, tighten it to a snug fit, and read your US size directly off the marked scale. What sizes does this ring sizer cover? It measures the full range of US sizes 1 through 17, including every half size in between, so it works for slender fingers and wider bands alike. Is this ring sizer reusable? Yes. The band loosens and releases so you can measure every finger and re-check as many times as you like — useful when you’re sizing more than one person or shopping for several rings. How accurate is it? It gives a reliable at-home reading that matches standard US ring sizing. For the best result, measure at the end of the day when your fingers are warm and slightly larger, and take two or three readings to confirm. How do I measure someone’s ring size for a surprise? Either borrow a ring they already wear and match it against the band, or measure their finger discreetly. Our ring size guide has more tips for sizing a partner without spoiling the surprise. Which finger should I measure? Measure the specific finger the ring is for — sizes can differ noticeably between hands and even between fingers. If it’s an engagement or wedding ring, measure the ring finger on the correct hand. What if I’m between two sizes? We recommend sizing up. A ring that’s slightly loose is far more comfortable than one that’s too tight, and it slides over the knuckle more easily. Can I measure my size for free instead? Yes — our printable and on-screen ring sizer lets you measure at home for free. This physical sizer is the more precise option if you’d rather measure by hand. How long does delivery take? The ring sizer ships via standard mail. Please allow approximately 1–2 weeks for it to arrive. Can I return the ring sizer? This item is a final sale and cannot be returned or exchanged.