Cold Brew JewelryCold Brew JewelryTools

Bench tools

Free precision tools for jewelry makers

Calculators and template generators, built by a jeweler who got tired of doing the same arithmetic on scratch paper.

  • free
  • no ads
  • nothing to install
Featured tool

Engraving Practice Patterns

Most musicians practice against sheet music. Engravers rarely have any. Divide a practice plate into sections, fill each with a different graver exercise, and print it at true size to transfer onto metal.

Open the generatorprint at 1:1

2 × 2 in plate · four sections

  • Hatch
  • Rays
  • Concentric arcs
  • Fish-scale
  • Spiral
Every other tool

Saw-Piercing Pattern Generator

Islamic geometric patterns for pendants and ornaments, printable at true size.

print at 1:1
LØ

Ring Blank Calculator

Length of metal strip for any ring size, corrected for stock thickness at the neutral axis.

strip length, mm
g/cm³

Metal Weight Calculator

Weight and cost of wire, sheet or tube across 14 metals, from sterling to platinum.

grams · price
π · d

Bezel Strip Calculator

How much bezel strip a round, oval, square or freeform stone needs.

strip length, mm
θ

Tapered Bezel Template

Printable annular template for a tapered bezel, sized to your stone and taper angle.

print at 1:1
n × π · d

Wire Length Calculator

Wire needed for wrapping, coiling and spiral work before you cut from the spool.

wire length, mm
IDAR

Jump Ring Calculator

Inside and outside diameter, total wire, aspect ratio and which weaves it will make.

ID · OD · AR
US 4710

Ring Size Chart

Convert between US, UK, EU and Japanese sizes, or print a chart to size a finger.

US · UK · EU · JP
Built by a maker

Hi, I'm Artem. I've been making jewelry since 2018 and building software for much longer. I kept reaching for a calculator app at the bench. Scratch paper, occasional mistakes. It got old fast, so I built the tools I wanted.

Every tool shows its maths in plain language before the formula, and every result is a number you can cut to. Templates print at true size. Nothing you type is stored, and you only need an email address if you want to download a file. Learn more about me, or read the tutorials on the Cold Brew Jewelry blog.

Densities used
Fine Silver
10.49 g/cm³
Sterling Silver
10.36 g/cm³
Copper
8.96 g/cm³
14K Yellow Gold
13.07 g/cm³
18K Yellow Gold
15.58 g/cm³
Platinum
21.45 g/cm³