How to Find Your Ring Size at Home (The Right Way)
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You found the ring. It looks perfect. You're about to order it — and then you stop.
What size am I?
It's the question that holds more people back from buying a ring online than anything else. And honestly, it shouldn't. Finding your ring size at home takes about two minutes, costs nothing, and when you do it correctly, you'll get it right on the first order.
This guide covers every method — with a string, with paper, with an existing ring — plus a full size chart and the mistakes most people make that throw off their measurement.
Before You Measure: Three Things to Know
1. Fingers change size throughout the day. Your fingers are slightly larger in the evening than in the morning, and they swell in heat and shrink in cold. Measure in the evening, at room temperature, for the most accurate result.
2. Different fingers are different sizes. Your ring finger on your right hand is not the same size as your ring finger on your left hand. Measure the specific finger you plan to wear the ring on.
3. If your knuckle is wider than the base of your finger, measure your knuckle. The ring has to pass over your knuckle to get on — so if your knuckle is the widest point, that's what determines your size. You can always size down slightly if the ring feels loose at the base.
Method 1: The Paper Strip Method (Most Accurate)
This is the method jewelers recommend. It's simple, and it gives you a precise measurement in millimetres.
What you need: A thin strip of paper (about 1 cm wide and 10 cm long), a pen, and a ruler.
Step 1. Wrap the paper strip snugly around the finger you want to measure. Not tight — snug. It should sit the way a ring would sit.
Step 2. Mark the point where the paper overlaps with your pen.
Step 3. Lay the paper flat and measure the distance from the end to your mark in millimetres. This is your finger circumference.
Step 4. Match your measurement to the size chart below.
That's it. Two minutes, done.
Method 2: The String Method
Same principle as the paper method, but with a piece of string or thin cord instead of paper.
Wrap the string around your finger, mark where it meets, then lay it flat against a ruler. The length in millimetres is your circumference. Use the chart below to find your size.
One note: use a non-stretchy string. Elastic or stretchy cord will give you a smaller measurement than your actual size.
Method 3: Measure an Existing Ring
If you already own a ring that fits the finger you're buying for, this is the fastest method.
Place the ring flat on a ruler and measure the inside diameter — the distance across the inside of the ring, from one inner edge to the other. Measure in millimetres. Match that number to the diameter column in the chart below.
This method is especially useful when you're buying a ring as a gift and you can borrow one of their rings without them knowing.
Ring Size Chart — US, UK, EU & Indian Sizes
| Inside Diameter (mm) | Circumference (mm) | US Size | UK Size | EU Size | Indian Size |
|---|---|---|---|---|---|
| 14.9 mm | 46.8 mm | 5 | J | 49 | 9 |
| 15.3 mm | 48.0 mm | 5.5 | K | 50 | 10 |
| 15.7 mm | 49.3 mm | 6 | L | 51 | 11 |
| 16.1 mm | 50.6 mm | 6.5 | M | 52 | 12 |
| 16.5 mm | 51.8 mm | 7 | N | 54 | 13 |
| 16.9 mm | 53.1 mm | 7.5 | O | 55 | 14 |
| 17.3 mm | 54.4 mm | 8 | P | 57 | 15 |
| 17.7 mm | 55.7 mm | 8.5 | Q | 58 | 16 |
| 18.1 mm | 56.9 mm | 9 | R | 59 | 17 |
| 18.5 mm | 58.1 mm | 9.5 | S | 60 | 18 |
| 18.9 mm | 59.5 mm | 10 | T | 62 | 19 |
| 19.4 mm | 60.8 mm | 10.5 | U | 63 | 20 |
| 19.8 mm | 62.1 mm | 11 | V | 64 | 21 |
What If You're Between Two Sizes?
This happens more often than you'd think. Here's how to decide:
Go up if: You have larger knuckles, your fingers tend to swell in heat or after exercise, or you prefer a looser fit.
Go down if: Your knuckles are slim relative to the base of your finger, you prefer a snug fit, or you're buying a wide band (wide bands fit tighter than narrow ones — size up half a size for bands wider than 6mm).
The half-size rule: When in doubt, go half a size up. A ring that's slightly loose is easier to resize than one that won't go past your knuckle.
Buying a Ring as a Gift? Here's What to Do.
This is where most people panic. You don't know their size, you can't ask without ruining the surprise, and you don't want to get it wrong.
Three options, in order of reliability:
Option 1: Borrow one of their rings. Take a ring they already wear on the finger you're buying for. Measure the inside diameter with a ruler. Match it to the chart above. Return the ring before they notice. This is the most accurate method for gift buying.
Option 2: Ask someone who might know. A close friend, sibling, or family member might know their ring size — especially if they've bought jewelry for them before.
Option 3: Choose an adjustable ring. The majority of our rings at Strovlin feature an open-band design that adjusts to fit US sizes 5–9. No measurement needed. If you're not sure of the size, this is the safest gift choice — it will fit.
Common Mistakes That Give You the Wrong Size
Measuring in the morning. Fingers are at their smallest in the morning. Measure in the evening for a more accurate result.
Measuring when cold. Cold fingers are smaller. If your hands are cold, warm them up first — run them under warm water for a minute.
Wrapping too tight. The paper or string should sit the way a ring would sit — snug but not cutting into the skin. If you can't slide it around easily, it's too tight.
Measuring the wrong finger. Your ring finger on your dominant hand is usually slightly larger than on your non-dominant hand. Measure the specific finger you plan to wear the ring on.
Ignoring the knuckle. If your knuckle is wider than the base of your finger, the ring has to pass over it. Measure the knuckle, not just the base.
Using a stretchy string. Elastic cord gives you a smaller reading than your actual size. Use non-stretchy string, thread, or a strip of paper.
What About Wide Bands?
Wide bands — anything over 6mm — fit tighter than narrow bands because they press against more of your finger. If you're buying a wide band, size up by half a size from your measured size. If you're between sizes, go up rather than down.
Narrow bands (under 4mm) fit true to size or can even be sized down slightly if you prefer a snug fit.
Frequently Asked Questions
Can I use a ring sizer app on my phone?
Phone-based ring sizer apps exist, but they are not reliable. Screen sizes vary between devices, and the apps cannot account for the thickness of your finger. The paper method takes the same amount of time and is significantly more accurate.
My ring arrived and it doesn't fit. What do I do?
If a ring from Strovlin doesn't fit, contact us with your order number and the size you need. We'll advise on the exchange process. For open-band rings, you can also gently adjust the band yourself — press inward to tighten, outward to loosen. Do this once or twice maximum; repeated bending weakens the metal.
Do ring sizes differ between countries?
Yes — the US, UK, EU, and India all use different sizing systems. The chart above covers all four. When shopping internationally, always check which sizing system the store uses and convert if needed. At Strovlin, we list sizes in US sizing with the full conversion chart available on our Size Guide page.
Is a size 7 the same everywhere?
A US size 7 corresponds to a UK size N, EU size 54, and Indian size 13. The number itself means nothing without knowing which system it refers to. Always check the system before ordering.
What if I want to buy a ring for a finger I've never worn one on before?
Measure it the same way — paper strip method, evening, room temperature. If you've never worn a ring on that finger, you might not know whether you prefer a snug or loose fit. When in doubt, go half a size up. You can always adjust an open-band ring, and a slightly loose ring is easier to deal with than one that won't go on.
One Last Thing
Ring sizing is not an exact science. Fingers change with temperature, time of day, and even what you've eaten. A ring that fits perfectly in the morning might feel slightly tight in the evening after a salty meal. That's normal.
What you're aiming for is a ring that slides on with a little resistance at the knuckle and sits comfortably at the base without spinning freely. That's the right fit.
Measure carefully, use the chart, and if you're still not sure — choose an adjustable ring or contact us before you order. We'd rather help you get it right the first time than deal with an exchange.