Ring Size Converter (US, UK, EU & International)
Secret ring size calculator for surprise proposals – calculate your partner's ring size without asking. Compatible with Tiffany, Cartier & luxury brands. Convert US to UK ring sizes, EU to US conversion, and international ring sizing. Perfect for engagement ring shopping, wedding bands, and jewelry purchases.
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Ring Size Converter
Complete Ring Size Chart
| US | UK | EU | MM |
|---|---|---|---|
| 3 | F | 44 | 14.1 |
| 3.5 | G | 46 | 14.9 |
| 4 | H | 47 | 15.3 |
| 4.5 | I | 48 | 15.7 |
| 5 | J | 49 | 16 |
| 5.5 | K | 50 | 16.5 |
| 6 | L | 52 | 16.9 |
| 6.5 | M | 53 | 17.3 |
| 7 | N | 54 | 17.7 |
| 7.5 | O | 55 | 18.2 |
| 8 | P | 57 | 18.6 |
| 8.5 | Q | 58 | 19 |
| 9 | R | 59 | 19.4 |
| 9.5 | S | 60 | 19.8 |
| 10 | T | 62 | 20.3 |
| 10.5 | U | 63 | 20.7 |
| 11 | V | 64 | 21.1 |
| 11.5 | W | 65 | 21.5 |
| 12 | X | 67 | 22 |
| 12.5 | Y | 68 | 22.4 |
| 13 | Z | 69 | 22.8 |
Secret Ring Sizing for Surprise Proposals
Stealth Measurement Methods
- • Trace her ring on paper while she sleeps
- • Borrow ring for "cleaning" (1 hour max)
- • Use string around finger during movie
- • Ask her best friend or sister secretly
Luxury Brand Sizing
- • Tiffany: Free resizing within 60 days
- • Cartier: European sizing (add 40 to US)
- • Blue Nile: Free ring sizer kit available
- • James Allen: Virtual try-on technology
Complete Guide to International Ring Sizes
Secret Ring Sizing for Surprise Proposals
Our stealth ring size calculator helps boyfriends secretly determine girlfriend ring size for surprise proposals. Compatible with Tiffany, Cartier, Blue Nile, Brilliant Earth, and James Allen engagement rings. Essential for Christmas proposals, Valentine's surprises, and anniversary engagements without spoiling the surprise.
Luxury Engagement Ring Brand Sizing Guide
Tiffany & Co uses US sizing with free 60-day resizing policy. Cartier uses European sizing (US 6 = EU 52). Blue Nile offers free ring sizer kits for accurate measurement. Brilliant Earth provides virtual try-on technology. James Allen features 360° ring views with precise sizing charts for online diamond shopping.
Best Times for Secret Ring Shopping
Christmas proposals require 2-week lead time for custom sizing. Valentine's Day engagements need January measurements for February delivery. Summer proposals benefit from winter sizing (fingers smaller in cold). Black Friday offers best luxury ring deals with extended return policies for sizing adjustments.
Real-World Ring Size Conversion Examples
Engagement Ring Scenarios
- US to UK Conversion: US 7 = UK N, US 6 = UK L (for British jewelry stores)
- EU to US Conversion: EU 54 = US 7, EU 52 = US 6 (for European designers)
- Surprise Proposals: Measuring existing rings or using string method for secret sizing
Secret Proposal Shopping Scenarios
- Tiffany Engagement Ring: Trace existing ring, use free 60-day resizing policy
- Cartier Love Ring: European sizing - US 6 = Cartier 52, ask boutique for conversion
- Blue Nile Diamond: Order free ring sizer kit 2 weeks before proposal
- Christmas Surprise: Measure in November, order by December 1st for delivery
Stealth Ring Measurement Techniques
- Sleep Method: Trace ring on paper while she sleeps (most accurate)
- Friend Network: Ask her best friend, sister, or mom for ring size
- Borrow Trick: "Clean" her ring for 1 hour, get it sized at jeweler
- String Technique: Wrap string around finger during movie, measure later
- Photo Method: Take photo of ring next to coin for size reference
Popular Secret Ring Sizing Searches
Most searched terms: secret engagement ring size calculator, how to find girlfriend ring size without asking, Tiffany ring size converter, surprise proposal ring sizing, Christmas engagement ring calculator, Valentine's Day proposal ring guide, stealth ring measurement, Blue Nile ring size chart, Cartier engagement ring sizing, James Allen ring size converter, Brilliant Earth sizing guide.