RINGMAKER SHOP TOOLS
Professional Calculators & References for Ring Makers
Ring Stock Cut Length
Starting blank length based on finished US ring size and measured stock thickness.
| Inside diameter | |
| Inside circumference | |
| Thickness allowance |
Spoon / Fork Ring Bending
Calculates starting length when the ends overlap.
| Base centerline length | |
| Added overlap |
Measure thickness where the ring will actually be formed. Flatware taper and springback can change final fit.
Find Ring Size With Calipers
Measure straight across the inside of the finished ring at its widest point.
| Your measurement | |
| Standard diameter | |
| Difference |
Ring Size Converter
| Inside diameter | |
| Diameter in inches | |
| Inside circumference | |
| Circumference in inches |
US Ring Size Quick Chart
Sizes 4–16, including half sizes.
| US | Diameter mm | Circ. mm | Dia. in |
|---|
Metal Clay Shrinkage
Calculate the pre-fire ring dimensions needed to reach a desired finished US ring size.
Example: enter 12 for a clay rated at 12% shrinkage.
| Desired finished size | |
| Finished inside diameter | |
| Entered shrinkage | |
| Pre-fire inside diameter | |
| Pre-fire circumference | |
| Target starting US size |
Use the shrinkage percentage specified for the exact metal clay product and firing schedule you are using. The target starting size is an estimate, not a guarantee. Verify the shrinkage rate for your exact clay and firing schedule, and confirm with your own test firing.