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Inches to Ring Size Converter
Convert ring measurements in inches to international ring sizes
Measurement to Ring Size
inches
Measure around your finger or inside an existing ring
Quick Examples (Circumference):
Ring Size to Measurements
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How to Measure
Existing Ring Method
- • Measure inside diameter with ruler
- • Or measure circumference with string
- • Use rings that fit properly
Finger Method
- • Wrap string around finger
- • Mark where ends meet
- • Measure string length
- • This gives circumference
Ring Sizing Tips
•
Measure at room temperature
•
Avoid measuring when hands are cold or hot
•
Ring should slide over knuckle with slight resistance
•
Consider ring width - wider rings need larger sizes
•
Measure several times for accuracy
Understanding Ring Size Conversion
How Ring Sizing Works
Ring sizes are standardized measurements that correspond to specific circumferences and diameters. Each country has its own sizing system, but they all relate to the same physical measurements.
International Systems
- •US & Canada: Numerical with fractions
- •UK & Australia: Letters A-Z with modifiers
- •European: Circumference in millimeters
- •Japan: Numerical system 1-30
Conversion Formula
Circumference to Diameter
Diameter = Circumference ÷ π (3.14159)
Diameter to Circumference
Circumference = Diameter × π (3.14159)
Accuracy Note
Ring sizes are standardized to specific measurements. This calculator finds the closest standard size to your measurement for the best fit.
Example: Converting 2.25" Circumference
Given Information
- Circumference: 2.25 inches
- Diameter: 2.25 ÷ 3.14159 = 0.716 inches
- Looking for: Ring size equivalents
Results
- US Size: 8 (closest match)
- UK Size: Q
- Exact circumference: 2.2498"
- Difference: Very close match
Related Ring Size Calculators
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