Ring sizing, metal weights, alloy mixing, diamond setting, stone charts and live metal prices. One jewellery calculator app. Zero guesswork. Built by a bench jeweller, for jewellers.
You're losing 5 to 10 minutes a day on calculations you've done a thousand times. That's an hour a week back at the bench doing actual work.
Free to download on iOS & Android
Built to simplify your daily workflow through intelligent, purpose-built tools that understand the jeweller's bench.
Every day at the bench you're hunting through charts, converting ring sizes in your head, working out alloy ratios on scrap paper, and Googling metal prices with polishing compound on your fingers.
That's 10, 15, 20 minutes a day. Every single day. Small interruptions that break your focus, slow your workflow, and add up to a serious chunk of your week.
14 calculators and 5 reference charts in one app. Each one was built because a working bench jeweller needed it, not because a product manager thought it would look good in the App Store listing.
Device-calibrated circles and finger bands. US, UK, EU, JP. All four systems supported with instant conversion.
Casting weight, ring weight, wire, sheet and tube. All instantly convertible to any metal or karat. 20+ alloys covered.
11 stone shapes, full mm to carat charts for round and fancy cuts. Look up any size in seconds.
Tell it your target karat and total weight. It calculates exactly how much of each component you need to mix.
Gold, silver, platinum, palladium. Updated in real time on your home screen.
Count stones by size across all 11 shapes. Get total carat weight in seconds, no running tally in your head.
Fit stones around a ring with correct spacing, then map out your exact layout visually before you touch a tool.
Gauge to mm, metals and alloys, saw blade sizes, solders, and gem reference. Always in your pocket.
Line items, markup, materials, labour. Get your sale price and profit margin. Export the quote straight to your client.
Carit is built by Ian Barnard, a bench jeweller specialising in micro diamond setting. After years at the bench reaching for charts, converting sizes in his head, and Googling the same formulas over and over, he decided to build the tool every bench jeweller actually needs.
This isn't a generic calculator dressed up in gold. Every feature exists because someone who works at a bench every day needed it.