Ring Size Guide: How to Secretly Measure (and Get It Right the First Time)

Getting the perfect engagement ring means more than choosing the right diamond—you also have to get the ring size right. Whether you're planning a surprise proposal or just want to avoid the hassle of resizing, this guide breaks down how to measure someone’s ring size (secretly or not), common sizing mistakes, and tips to make sure the ring fits comfortably on day one.

What Is the Average Ring Size?

• Women’s average ring size: 6–7

• Men’s average ring size: 9–10

• Most jewelers stock sizes 5–9 for women

• Sizes can vary by finger, hand, season, and time of day

Even ½ sizes make a difference—especially for wider bands.

How to Secretly Find Their Ring Size

1. Borrow a Ring They Already Wear

Choose one worn on their left ring finger if possible

Trace the inside on paper or press into soap or clay

Bring the ring to a jeweler or use a ring sizing chart online

Make sure the ring isn’t worn on the middle finger—it’ll be too big.

2. Ask a Friend or Family Member

Especially effective if the person has recently gotten engaged

They may have helped shop for rings or tried them on together

3. Use a String or Paper Trick (While They Sleep)

Gently wrap string or thin paper around their ring finger

Mark where it overlaps

Measure with a ruler and compare to a sizing chart

Be careful—swollen or cold fingers can skew results.

4. Guess Strategically (With a Safety Plan)

If unsure, size slightly up (easier to resize smaller than larger)

Choose a setting that’s resizable—avoid full eternity or tension bands

Opt for temporary sizing beads if proposing soon and resizing later

How to Measure Your Own Ring Size (When Shopping Together)

• Printable ring sizer: Compare an existing ring to a size guide

• Ring sizing tool: Order an inexpensive plastic ring sizer

• In-person measurement: Visit any jeweler for a free sizing (even if you don’t buy there)
  

• Always measure at room temperature, midday. Avoid first thing in the morning or after a workout.

Sizing Tips by Ring Style

Common Mistakes to Avoid

• Guessing based on hand size alone

• Measuring fingers in cold weather (they shrink)

• Using a stretchy string or tape

• Forgetting to account for band width

What If the Ring Doesn’t Fit?

• Most engagement rings can be resized ±1–2 sizes

• Resizing takes 7–14 days, depending on complexity

• Avoid resizing for full eternity bands, tension settings and intricate pavé all the way around

Pro tip: Many jewelers offer free first-time resizing within 60 days of purchase.

Getting the size right is one of the most underrated parts of buying an engagement ring. But with a little planning—and some sneaky detective work—you can surprise your partner with a ring that fits just as perfectly as it sparkles.