Convert Carats to Quarters
Convert Carats (ct) to Quarters (qr) instantly and accurately.
Conversion Formula
qr = ct × 1.574730444e-5
About Carats
A metric carat (ct or CD) is exactly 200 milligrams (0.2 g), the universal standard for weighing gemstones. Established internationally in 1907, it replaced fractionally different regional carat weights previously used in different countries. The total weight of a diamond or colored gemstone is always expressed in carats: a 1.00 ct diamond of excellent cut and color can command over $5,000. The Cullinan diamond, the largest gem-quality rough diamond ever found, weighed 3,106.75 carats.
About Quarters
A quarter (qr) in the avoirdupois system equals 28 pounds or one quarter of a hundredweight - approximately 12.70 kg. Historically, quarters were used in British trade for measuring grain, wool, and other bulk commodities. The British quarter of grain (28 lb) was the standard purchase quantity at markets and mills throughout medieval and early modern England. In the US, the term 'quarter' sometimes refers to a quarter of a short hundredweight (25 lb) rather than the British 28 lb.
Quick Reference Table
| Carats (ct) | Quarters (qr) |
|---|---|
| 1 ct | 1.575 × 10-5 qr |
| 2 ct | 3.149 × 10-5 qr |
| 5 ct | 7.874 × 10-5 qr |
| 10 ct | 0.000157473 qr |
| 25 ct | 0.000393683 qr |
| 50 ct | 0.000787365 qr |
| 100 ct | 0.00157473 qr |