Ring Sizer: Finger Size Finder

Ring Sizer helps you find your exact ring size and finger size at home no jeweler visit needed. Accurate to 0.1mm, it is the go-to tool for engagement ring shopping, wedding band sizing, and online jewelry purchases.
Two Measurement Methods
Finger Measurement: Place your finger on the screen and get your ring size instantly with live visual guides.
Ring Measurement: Place an existing ring on screen, match the inner diameter, and get the exact size in seconds.
Both methods work offline. No internet needed after download.
Supports All Global Ring Size Standards
US and Canadian sizes (3–13), UK and Australian sizes (A–Z+7), European ISO sizes (41–76), and Japanese sizing — with instant conversion between all systems. Ideal for international jewelry shopping.
Save and Organize Your Sizes
Store ring sizes for multiple fingers with custom labels — "left ring finger," "mom's gift," or any note you need. All measurements are date-stamped and saved privately on your device only. Your data never leaves your phone.
Perfect Fit Every Time
Wrong ring size is one of the most common reasons for jewelry returns. Whether you are buying a diamond ring, a gold wedding band, or planning a surprise engagement gift, Ring Sizer gives you the precise finger measurement you need before you order.
Who Uses Ring Sizer

Engagement ring shoppers buying online
Wedding band planning for couples
Gift buyers who need a ring size without asking
Professional jewelers for quick client sizing
Ring collectors managing multiple sizes

Key Features

Finger sizer and ring diameter measurement tools
Ring size chart for US, UK, EU, AU, JP
Ring size converter for international standards
Save unlimited measurements with custom names
Works offline, no account needed
Privacy-focused: all data stored on device

Download Ring Sizer and measure your ring size in seconds.