Ring Size Calculator

Get 100% Accurate results with Calibrated Screen

How to calibrate? Follow these simple steps. Click.

•••> Pick a ruler in your hand


•••> Go to the tool and click calibrate now ( a green dotted rectangle will appear on the grid )


•••> Make the length of the rectangle 30 mm with your ruler on the screen


•••> Once done, click finish calibration ( the screen will scroll to the ring calculator section)


•••> place the ring on the screen (Circle) and adjust its boundary with the ring size (results will be shown as the ring size changes, no need to click any button to get results).

Still not sure how?  See our Step-by-Step guide

Digital Ring Sizer

Ring Sizer Pro — Polished
Important:Your measurements will only be as precise as this step.
Digital Ring Sizer
Please calibrate first to ensure accurate measurements.
💡 Step 1 — Calibrate: Place a credit card (85.6 mm) or any known-width object on the screen and drag the green handle until the rectangle matches the object width.
Calibration Settings
Reference object
Known width (mm)
Estimated px/mm
Step 2 — Measure Ring
Adjust your ring so its outer edge aligns perfectly with the outer (dotted) surface of the circle below.
💡 Measure your ring: Resize the circle until its inside edge matches the inner edge of your ring.
Measurements
Diameter (mm)
Circumference (mm)
Diameter (in)
Best match (US)
UK: • EU:
Saved Measurements
                     

Printable Ring Size Chart: once you know your rings diameter or circumference, you can find the standard number against it. For this

Download Our Free Chart →

Other ways to Measure Your Ring Size at Home

Not sure of your size? Don’t worry — there are several easy ways to measure your ring size without leaving home.

  • String : (1) Wrap a piece of string snugly around your finger. (2) Mark the spot where the end overlaps with the string. (3) Straighten the string and measure its length with a ruler. This measurement is your finger's circumference.
Ring Size Calculator. Image, demonstrating the string ruler method to calculate ring size manually.
  • Strip of Paper: (1) Take a thin strip of paper and wrap it snugly around your finger. (2) Use a pen to mark the exact spot where the paper overlaps. (3) Lay the paper strip flat and measure the length to your mark with a ruler. This measurement gives you your finger's circumference.
Ring Size Calculator. Image, demonstrating the paper strip and ruler method to measure ring size manually.

Pro Tips for Accuracy:

  • Measure at different times of the day (fingers can swell in heat or after activity).
  • Avoid measuring in extreme cold or heat for the most reliable result.
  • If you’re choosing a wide band, go up half a size for a comfortable fit.

Did you know? The average ring size for women is between 6–7 (US), while men usually fall between 9–11.

[Get Quick Info. Here →]

Frequently Asked Questions About Ring Sizes

How do I measure my ring size online?

You can use our online ring size calculator. Simply place your ring on the screen, adjust the guide, and our calibration ensures accurate results across all devices.

What is the average ring size for women and men?

For women, the average ring size is typically between US 6 and 7. For men, it’s usually between US 9 and 11. However, finger shapes and preferences vary, so measuring is always the best option.

How accurate is the ring size calculator?

Our calculator is designed for 100% accuracy when the screen is calibrated properly. For extra certainty, you can also download and use our printable ring size chart (PDF).

Can I print a ring size chart?

Yes! We provide a free, printable ring size chart that you can download as a PDF. Place your existing ring on the circles or use the finger guide for a precise measurement.

How do I convert ring sizes between US, UK, and EU?

Our international ring size chart shows side-by-side conversions for US, UK, EU, and mm measurements (diameter & circumference). Simply find your size in one system, and the chart will give you the equivalent in others.

Find Your Ring Size in Minutes — Free, Accurate, Trusted.

Whether you’re shopping for an engagement ring, wedding band, or a special gift, getting the right size matters. Our free online ring sizer makes the process simple, fast, and accurate — no guesswork, no stress.

Join thousands of people worldwide who have already found their perfect fit using our ring size calculator and international chart.

Scroll to Top