Diam Calc Pro

Professional diamond weight calculator with real gem photography. Calculate carats for all 11 cuts — redesigned with iOS 26 Liquid Glass.

Diam Calc Pro is the professional diamond weight estimator trusted by jewelers, gemologists, and diamond enthusiasts worldwide.

Instantly calculate the estimated carat weight of any diamond using industry-standard formulas. Simply enter the measurements and get accurate results in seconds — no internet required.

11 DIAMOND SHAPES SUPPORTED • Round Brilliant • Oval • Pear • Heart • Marquise • Princess • Cushion • Emerald (Step Cut) • Radiant • Trilliant • Asscher (Step Cut)

HOW IT WORKS Enter the diamond's length, width (for fancy shapes), and height — either as a percentage of diameter or in millimeters. The app returns:

• Average diameter (mm) • Height percentage (%) • Height in millimeters (mm) • Estimated weight in carats (ct)

DESIGNED FOR PROFESSIONALS Diam Calc Pro is built for speed and accuracy. Whether you're at a trade show, a jewelry bench, or a buying desk, you'll have precise weight estimates at your fingertips.

WHAT'S NEW IN VERSION 3.1.0 Complete redesign built for iOS 26 with Apple's Liquid Glass material system. Real diamond photography, per-shape accent colors, dark & light mode support, animated splash screen, and a fully native SwiftUI interface.

PRIVACY: No account required. No data collected. No ads. Your calculations stay on your device.

Diam Calc Pro is a paid, ad-free app - a one-time purchase for professionals who demand the best tools.

Thanks for using Diam Calc Pro!