💍

Ring Size & Metal Usage Calculator (Jewelry Resizing)

Calculate the circumference change when resizing a ring between US sizes and estimate the weight of metal added or removed.

Current ring size on the US scale. Half sizes (e.g. 7.5) are accepted.
Desired ring size after resizing.
Width of the ring band in mm (measured along the finger).
Thickness of the ring shank in mm (radial depth of the metal).
Select the ring metal to estimate the weight of material added or removed.

Results

Circumference Change2.62 mm circumference change
Metal Added / Removed0.454 g metal added/removed
Current Inner Diameter17.67 mm current inner diameter
Target Inner Diameter18.50 mm target inner diameter

📖What is it?

Ring resizing involves cutting the shank and either adding a small metal segment (sizing up) or removing metal and soldering the gap closed (sizing down). This calculator estimates the exact circumference change and the weight of precious metal involved.

🎯How to use

Enter your current and target US ring sizes (use a ring sizer or measure an existing ring's inner diameter), the band width and thickness, and the metal type. The output shows how much the circumference changes and the approximate weight of metal your jeweler will work with.

💡Example scenario

Going from US size 7 to 8 in a 6 mm wide, 1.5 mm thick gold band: diameter increases from 17.17 mm to 18.00 mm. Circumference change ≈ 2.61 mm. Metal volume ≈ 2.61 × 9 = 23.5 mm³. Gold weight ≈ 23.5 × 19.3 / 1000 ≈ 0.45 g of gold — just a few dollars in material cost, though jeweler labor drives the actual price.

🏆Pro tip

Most jewelers can resize ±2-3 US sizes without compromising the ring. Beyond that, the shank geometry may distort. Rings with full eternity settings (stones all around) cannot be resized. For sizing down, the removed metal is returned by many jewelers. Always confirm with a professional ring sizer — fingers swell throughout the day, so measure in the evening.