Find Your Perfect Fit

Whether you're dropping a hint, shopping for a surprise, or treating yourself, use our expert tools to find your exact ring size from home.

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01. The Perfect Fit 02. Conversion Chart 03. At-Home Tools 04. Pro Tips 05. Resizing Policy 06. FAQs
02. MEASUREMENT CHART

BlueHira Conversion Chart

Find your standard US/Canada size using the inside diameter or circumference of your finger. Swipe horizontally on mobile to view international conversions.

Centimeters (cm) Inches (in)
US SIZE FINGER CIRCUMFERENCE FRANCE UK
2 4.14 cm 1.63 in 41.5 D
2.5 4.29 cm 1.69 in 42.75 E
3 4.41 cm 1.74 in 44 F
3.5 4.54 cm 1.79 in 45.5 G 1/2
4 4.70 cm 1.85 in 47 H 1/2
4.5 4.80 cm 1.89 in 48 I 1/2
5 4.90 cm 1.93 in 49.5 J 1/2
5.5 5.05 cm 1.99 in 50.5 L
6 5.18 cm 2.04 in 52 M
6.5 5.30 cm 2.09 in 53 N
7 5.43 cm 2.14 in 54.5 O
7.5 5.56 cm 2.19 in 56 P
Note: BlueHira crafts rings in exact quarter sizes upon request during checkout.
03. AT-HOME TOOLS

3 Easy Ways to Measure

HIGHEST ACCURACY

Request a Free Sizer

Get a professional-grade plastic ring sizer shipped directly to your door, absolutely free.

Printable Guide

Need your size right now? Download our official bh_ring_size_guide.pdf containing a paper cut-out sizer. Be sure to verify the 100% scale using a credit card!

Download PDF Guide
BEST FOR SURPRISES

Match an Existing Ring

Keeping it a secret? Borrow a ring they wear. Download our bh_ring_size_guide.pdf and place the ring over the size circles to find the perfect match.

Tip: Align the inner edge of the ring with the outer edge of the printed circle for best results.
04. EXPERT ADVICE

Pro-Tips for Measuring

Temperature Matters

Fingers shrink in the cold and swell in the heat. Measure at room temperature at the end of the day when your fingers are largest.

Consider Band Width

Wider bands (over 4mm) fit more snugly than thin bands. You may want to order a half size up for thick bands.

Knuckle Size

If your knuckle is significantly larger than the base of your finger, measure both and pick a size halfway between the two.

Diet & Salt

Avoid measuring after salty meals or alcohol, which can cause water retention and temporary swelling.

06. Questions?

Frequently Asked Question (FAQs)

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What is the most common ring size?

Affirm and the BlueHira Credit Card's Fixed APR plan allow early payoff with no prepayment penalty (confirm BlueHira Card specifics with Synchrony). Acima's 90-day early purchase option is specifically designed to reward paying early — it's the cheapest way to finish an Acima lease.

Does BlueHira offer quarter sizes?

Affirm and Acima both use a soft check that doesn't affect your credit score at the pre-qualification stage. The BlueHira Credit Card application through Synchrony is a standard credit application — confirm with Synchrony whether that's a soft or hard pull before publishing this answer.

What if I guess the wrong size for a surprise proposal?

Yes — Acima's approval is based on income and banking history rather than a traditional credit score, making it the option here that doesn't require established credit.