How do I calculate the strip length for a ring?

The strip length equals the internal circumference of the ring (pi x diameter) plus an allowance for metal thickness (pi x thickness) plus a small solder joint allowance. This ensures the strip wraps around to form the correct internal size.

What thickness should I use for a ring blank?

For a standard comfort ring, 1-1.5 mm is typical. Thinner bands (0.8 mm) work for delicate designs but may bend. Thicker stock (2 mm+) is used for heavy or carved rings. Sterling silver is commonly worked at 1 mm.

Why add a solder allowance?

A small gap (0.5-1 mm) accounts for metal lost during filing the joint flat and ensures a clean solder seam. Without this allowance the ring may end up slightly too small after soldering and finishing.

How do UK ring sizes work?

UK ring sizes use letters from A to Z, where each letter corresponds to an internal diameter in millimetres. For example, UK size P is 18.1 mm diameter. The most common sizes for women are L-P and for men are R-V.

CraftCalcs

Ring Blank Calculator \u2014 Metal Strip Dimensions for Ring Making

Calculate the metal strip length and width needed for a ring blank given UK ring size and band width.

UK Ring Size

Select the UK ring letter size

Band Width

Width of the ring band

Metal Thickness

Thickness of the metal sheet

Metal Type

Affects weight estimate

How We Calculate This

This calculator works out the flat metal strip dimensions you need to cut to form a ring blank of the correct size.

How it works

The internal circumference is calculated from the ring diameter (pi x diameter). Metal thickness is accounted for by adding pi x thickness to the strip length. A solder allowance is added for filing and joining. The estimated weight uses the density of the chosen metal.

Frequently Asked Questions

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Last updated: March 2026

All calculations are estimates. Always verify quantities before purchasing materials.