Direct conversion
Convert carat [ct] to quarter (US) [qr US] instantly with formula, examples, chart, and FAQs.
1 carat [ct] = 0.000018 quarter (US) [qr US]
1 carat [ct] = 0.000018 quarter (US) [qr US]
Example: 1 carat [ct] equals 0.000018 quarter (US) [qr US].
Weight and mass conversions use kilogram as the reference unit. Common factors include 1 pound = 0.45359237 kilogram and 1 ounce = 0.028349523125 kilogram.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-08-14.
The carat (ct) is a weight unit used to express measurements in this converter.
HistoryThis unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current useUse carat when comparing weight values, checking specifications, converting between systems, or preparing quick estimates.
The quarter (US) (qr US) is a weight unit used to express measurements in this converter.
HistoryThis unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current useUse quarter (US) when comparing weight values, checking specifications, converting between systems, or preparing quick estimates.
| carat [ct] | quarter (US) [qr US] |
|---|---|
| 1 | 0.000018 |
| 2 | 0.000035 |
| 5 | 0.000088 |
| 10 | 0.000176 |
| 20 | 0.000353 |
| 25 | 0.000441 |
| 50 | 0.000882 |
| 100 | 0.001764 |
| 1000 | 0.017637 |
Use this formula: 1 carat [ct] = 0.000018 quarter (US) [qr US] Enter your value in the calculator and the result updates instantly.
1 carat [ct] equals 0.000018 quarter (US) [qr US].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.