TrymivoStart with screen scale
Use a standard ID-1 card’s short edge. Match the guides carefully while keeping the card flat. The card is a physical reference only; no image or card details are collected.
Use a ring or a paper strip
For an existing ring, align the guide to the inner diameter. For a strip, match the two marked points after wrapping it around the finger. Finger placement still requires circumference confirmation.
Keep the device stable
Changing browser zoom, orientation or display settings can invalidate the scale. Recalibrate if anything changes or the result looks wrong. The marketing demo deliberately keeps its measurement state in memory.
Know the limits
The estimate is a closest chart match, not a guarantee. Device accuracy, measurement technique, knuckles and band shape can affect fit. Confirm with a physical ring sizer before buying.
Put useful guidance on your product page.
Explore Ring Sizer’s chart controls, targeting and measurement methods.
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