How many micrograms are in one carat?

Exactly 200,000 micrograms equal one metric carat (ct). This is an exact, defined relationship: 1 ct = 0.2 g = 200,000 µg.

Is the carat used here the metric carat or the gold karat?

This tool uses the metric carat (ct), the unit for gemstone mass equal to 0.2 grams. It is different from the karat (kt), which measures gold purity.

Results are displayed to six decimal places, which is more than sufficient for all practical gemological and scientific applications.

Yes. The converter handles any positive number. Very small values (e.g., 1 µg) will produce a correspondingly tiny carat result (0.000005 ct).

Multiply carats by 200,000. For example, 2.5 ct × 200,000 = 500,000 µg.

Name: Micrograms to Carats Converter
Availability: InStock
Author: Nham Vu

Enter a value in micrograms and instantly get the equivalent weight in carats (1 ct = 200,000 µg).

Micrograms (µg)

Micrograms (µg)	Carats (ct)

Enter one microgram value per line.

Enter a value in micrograms and instantly get the equivalent weight in carats (1 ct = 200,000 µg).

Convert gemstone weights reported in micrograms to the carat unit used by jewelers.
Cross-check laboratory balances that output in micrograms against carat specifications.
Convert batch measurements for precious stones or metals in bulk.
Verify micro-scale pharmaceutical or chemical masses in carats when required.
Students and researchers converting between SI micro-units and gemological units.

Last updated: 2026-06-11 · Reviewed by Nham Vu