Two minutes and a strip of paper.
Find the size that disappears on your finger.
The sensors sit in a fixed layout inside the band, and the gesture engine is tuned for one position: the index finger of the hand you write and swipe with. Worn there, every gesture reads clean and control feels immediate — so that's the finger to measure.
Your two index fingers can differ by a full size. Always go by your dominant hand.
Move it to your middle, ring or little finger and every gesture stops working — swipes, pinches, circles and traces all rely on the sensors sitting where they expect. Health tracking would carry on, but skipping a track, turning a page and handing off between devices would not.
Fit is where control starts, so we take sizing seriously. Quick or certain — every path below ends at the same place: a ring that disappears on your finger.
Wrap a strip of paper around your dominant index finger, mark where it overlaps, and enter the length — we turn it into your US size.
A one-page PDF with every size marked at exact scale. Print at 100%, cut the strip, wrap it — and read your size straight off your finger.
Check the 80 mm bar on the page before you trust it — accuracy is the whole point.
Ten ring models, US 6–15, each with its size marked on it. Print two adjacent sizes, wear them on your dominant index finger, and shake-test the fit — a real ring you can judge today, for a few grams of filament.
A printed ring grips far less than the real one, so the fit is settled by a shake test, not by how it feels. Read the guide before you print.
The KiWear Sizing Kit is a full try-on set, US 6–15 — wear your closest sizes through a real day and lock the exact fit before we make yours.
05 · Rather ask? Tell us the measurement you got, or the smart ring you wear now — sizes aren’t interchangeable across brands, and we size people every day. We’ll recommend yours personally.
contact@kiwear.comPrint at 100% — turn off “fit to page”. Check the scale bar below: it should measure exactly 80 mm before you start.
KiWear Ring is worn on the index finger of your dominant hand — the one you write and swipe with — because the sensors inside the band are laid out for that position. Measure that finger only: your two index fingers can differ by a full size. It fits your middle, ring or little finger too and health tracking keeps working there, but gesture control does not.
Cut out the strip below along its dashed edge. Wrap it around the base of that finger — snug, not tight — starting from the 0 edge, and read the size where the strip overlaps. If your knuckle is wider than your finger base, wrap the knuckle instead and use that size.
The index finger of your dominant hand — the one you write and swipe with. KiWear Ring is made to be worn there, and every gesture is tuned for that finger. Your left and right index fingers can differ by a full size, so measure the hand you'll actually wear it on; don't use another finger as a stand-in.
Wrap a strip of paper around your dominant index finger, mark where it overlaps, and measure the length in millimetres — the size finder above turns it into your US size. If you have a printer, the true-scale sizer (PDF) prints that strip with every size marked at exact scale, so you can read your size straight off your finger. With a 3D printer, you can go further and print the try-on rings themselves.
Use it as a reference, not a rule. Smart ring sizes aren't interchangeable — brands cut their sizes differently, so your usual number may match your KiWear size or sit one size off. The true-scale paper sizer settles it in two minutes; or reach out with the ring you wear now and we'll recommend your size.
Evening, 6–9pm, when your fingers sit at their natural daily peak — then re-check the next morning. Skip it right after exercise, a hot shower, or when your hands are cold or swollen. Keep your arm relaxed and hand loose, and measure the exact finger you'll wear it on.
Yes — the sizing tools above include a free download with all ten ring models, US 6–15, so you can print real try-on rings at home. Two things to know: print at 100% with every scaling option off, and don’t judge them by feel. The real ring is filled with potting resin inside the band and grips far more than a printed model, so a print will always feel looser than the real thing. Wear it, shake your hand hard about 30 times, and if it stays on, that size works.
KiWear uses whole US sizes only, so always round up. Paper and strip readings tend to run half to one size large, so trim a little. A ring should breathe and keep its sensors on your skin — favour a touch of room over a tight squeeze.
A little. Wide knuckle with a slim base: size to clear the knuckle — a little play at the base is normal. Prone to swelling: size to your peak and round up. Slim fingers: measure relaxed so it won't spin and slip. Sweaty hands: dry off first, then pick a standard snug size.
The KiWear Sizing Kit — a full try-on set, US 6–15 — lets you lock your exact size before we make yours. Because sizing happens before fulfillment, a bad fit is rare — but if the size you confirmed still isn't right when it arrives, we'll exchange it.
Join the list for the Kickstarter launch and early-bird pricing. One small gesture to start — we'll handle the rest.
