Ring Sizer vs RingSizer

Ring Sizer makes finding your perfect ring size fast, accurate, and fun, whether you're shopping for an engagement ring, wedding band, or a gift. MEASURE ANY RING OR FINGER • Place a ring on your screen and match the adjustable circle, or use two-point tap for precision • Measure your finger with the on-screen gauge — just slide to fit • Use your camera to scan a ring or finger for hands-free sizing • Auto-calibrated to your device's exact screen PPI for reliable results BROWSE A CURATED RING GALLERY • Explore 30 beautifully crafted rings in gold, rose gold, platinum, silver, and more • Filter by metal type or gemstone, diamond, sapphire, ruby, emerald, morganite, and others • View each ring up close with detailed descriptions AI VIRTUAL TRY-ON • Take a photo of your hand and see any ring from the gallery on your finger • Powered by AI image generation for photorealistic results • The easiest way to visualize a ring before you buy YOUR SIZING VAULT • Save every measurement with date, method, and notes • Compare sizes side by side to track changes over time • Convert instantly between US, UK, EU, JP, CN, and RU ring sizes BUILT FOR ACCURACY • Automatic screen calibration with known device PPI data • Fine-tune calibration manually with a coin or credit card • Confidence indicator shows how reliable each measurement is • Ring width adjustment recommends sizing up for wider bands Ring Sizer is the only ring size app that combines precise measurement tools, an international size converter, a ring gallery, and AI-powered virtual try-on.

RingSizer turns your iPhone into a precision jeweler's tool — no ring sizer, no guesswork, no trip to the store. MEASURE YOUR RING Already have a ring that fits? Place it flat on your screen and align it with the on-screen guide. RingSizer uses your device's exact screen dimensions — with optional bank-card calibration for extra precision — to calculate your true size. MEASURE YOUR FINGER No ring on hand? Use the two-step Ellipse Method. Fingers aren't perfectly round, so RingSizer measures both width and thickness for a scientifically accurate fit, based on the same math jewelers use. CONVERT BETWEEN SYSTEMS Instantly convert between EU, US, UK, Japanese, Australian and Swiss/German ring sizes — or look up any size by diameter and circumference. LIFE-SIZE RULER A true-to-scale on-screen ruler for measuring anything small, in mm, cm or inches. FEATURES • High-accuracy ellipse-based finger measurement • Bank-card screen calibration for pixel-perfect results • Worldwide size conversion (EU, US, UK, JP, AU, CH/DE) • Save and organize your measurement history • Evening measurement reminder — fingers swell throughout the day, so a second reading helps you land on your truest size • Private by design — your measurements never leave your device RingSizer Premium unlocks unlimited history, expert fitting advice, and full worldwide size conversion — with a one-time purchase, no subscription. Whether you're buying a ring as a surprise, replacing a lost one, or shopping online, RingSizer gives you a confident, accurate answer in seconds.